Updated on 2024/08/06

写真a

 
NAKANISHI Hiroyuki
 
Organization
Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Physics and Astronomy Program Associate Professor
Title
Associate Professor
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Degree

  • 博士(理学) ( 2005.3   東京大学 )

  • 修士(理学) ( 2002.3   東京大学 )

  • 学士(理学) ( 2000.3   東京大学 )

Research Interests

  • galaxy

  • interstellar medium

  • milkyway

  • optical

  • radio

  • 銀河天文学

  • 電波天文学

  • 観測

  • 電波

  • 可視光

  • 星間ガス

  • 渦巻銀河

  • 銀河系

Research Areas

  • Natural Science / Astronomy

Education

  • The University of Tokyo   Faculty of Science   Astronomy

    2002.3 - 2005.3

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    Country: Japan

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  • The University of Tokyo   Faculty of Science   Astronomy

    2000.3 - 2002.3

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    Country: Japan

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  • The University of Tokyo   Fucalty of Science   Astronomy

    1996.4 - 2000.3

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    Country: Japan

Research History

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Department of Science Physics and Astronomy Program   Associate Professor

    2020.4

  • Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Physics and Astronomy Course   Associate Professor

    2007.11 - 2020.3

Professional Memberships

  • 理科教育学会

    2021.9

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  • 日本物理学会

    2018.8

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  • 電子情報通信学会

    2012.9

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  • 地学教育学会

    2012

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  • Australia Astronomical Society

    2007.6 - 2015

  • International Astronomical Union

    2005

  • 国際天文学連合

    2005

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  • International Astronomical Union

    2005

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  • Astronomical Society of Japan

    2000

  • 日本天文学会

    2000

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Committee Memberships

  • Publications of the Astronomical Society of Japan   editor  

    2018.5   

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    Committee type:Academic society

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Papers

  • NAKANISHI Hiroyuki, YAZAKI Yoshinao, SHIMODA Harunobu, SAKAKIBARA Yasushi .  Trial Classes on Diurnal and Annual Star Motion Using a Portable Planetarium: Introducing a Self-made Planetarium into a Junior High School .  Education of Earth Science76 ( 4 ) 81 - 95   2024.5Trial Classes on Diurnal and Annual Star Motion Using a Portable Planetarium: Introducing a Self-made Planetarium into a Junior High School

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    Language:Japanese   Publisher:Japan Society of Earth Science Education  

    <p>A portable planetarium is expected to be effective in teaching astronomy in science classes. We investigated whether the use of a portable planetarium improves students’ understanding of diurnal and annual motion. We gave trial classes on diurnal and annual motion for grade nine students in a junior high school using a handmade portable planetarium. A questionnaire survey showed that the planetarium class was effective in improving students’ understanding of annual motion but showed little difference regarding their understanding of diurnal motion.</p>

    DOI: 10.18904/chigakukyoiku.76.4_81

  • Poojon P., Chung A., Hoang T., Baek J., Nakanishi H., Hirota T., Tsai C.W. .  Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations .  Astrophysical Journal963 ( 2 )   2024.3

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    Language:Japanese   Publisher:Astrophysical Journal  

    We present the results of the single-dish observations using the Korean VLBI Network to search for anomalous microwave emission (AME) in nearby galaxies. The targets were selected from ‘Mapping the dense molecular gas in the strongest star-forming galaxies' (MALATANG), a legacy survey project of the James Clerk Maxwell Telescope. The MALATANG galaxies are good representatives of local galaxies with enhanced nuclear activity associated with star formation and/or active galactic nuclei (AGNs), providing IR-bright galaxy samples; thus, they are good candidates for AME hosts. Combining with ancillary data, we investigated the radio-IR spectral energy distribution (SED), while searching for AME signals in five galaxies. The AME in NGC 2903 was well detected at a significant confidence level, whereas that in NGC 2146 and M82 was marginal. NGC 1068 and Arp 299 indicated no significant hints, and we provide upper limits for the AME. The best-fit SED exhibited local peaks of the AME components at higher frequencies and with stronger peak fluxes than those in previous studies. This suggested that AME originates from denser environments such as molecular clouds or photodissociation regions rather than warm neutral/ionized medium as commonly suggested by previous studies. Further, our AME-detected targets were observed to exhibit higher specific star formation rates than the other extragalactic AME hosts. Furthermore, AME favored starburst galaxies among our sample rather than AGN hosts. Consequently, this might imply that AGNs are excessively harsh environments for tiny dust to survive.

    DOI: 10.3847/1538-4357/ad1bc8

    Scopus

  • Nakanishi H., Sakai N., Kurahara K. .  Astrometry of Water Maser sources in the Outer Galaxy with VERA .  Proceedings of the International Astronomical Union18   119 - 121   2022.12

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    Language:Japanese   Publisher:Proceedings of the International Astronomical Union  

    While the rotation curve of the inner Galactic disk is well determined, study of the outer rotation curve requires observational measurements of distances and proper motions of individual sources in the Outer Galaxy. We report astrometric observation for water maser sources in the Outer Galactic disk conducted with VERA, aiming to measure the Outer Rotation Curve. We have measured annual parallaxes and proper motions for these objects. Our result was consistent with recent other works based on astrometry and classical Cepheid observations. Epicyclic frequency seems to suggest that 2 and 4 spiral mode are dominant in the inner and outer Galaxy, respectively.

    DOI: 10.1017/S1743921323003010

    Scopus

  • Sakai N., Nakanishi H., Kurahara K., Sakai D., Hachisuka K., Kim J.S., Kameya O. .  The origin of the Perseus-arm gap revealed with VLBI astrometry .  Proceedings of the International Astronomical Union18   97 - 100   2022.12

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    Language:Japanese   Publisher:Proceedings of the International Astronomical Union  

    The Perseus arm has a gap in Galactic longitudes (l) between 50° and 80° where the arm has little star formation activity. To understand the gap, we conducted VERA (VLBI Exploration of Radio Astrometry) astrometry and analyzed archival H I data. We report on parallax and proper motion results from four star-forming regions, of which G050.28-00.39 and G070.33+01.59 are associated with the gap. Perseus-arm sources G049.41+00.32 and G050.28-00.39 lag relative to a Galactic rotation by 77 ± 17 km s-1 and 31 ± 10 km s-1, respectively. The noncircular motion of G049.41+00.32 cannot be explained by the gravitational potential of the arm. We discovered rectangular holes with integrated brightness temperatures less than 30 K arcdeg in l vs. V LSR of the H I data. Also, we found extended H I emission on one side of the Galactic plane when integrating the H I data over the velocity range covering the hole. G049.41+00.32 and G050.28-00.39 are moving toward the emission. The Galactic H I disk at the same velocity range showed an arc structure, indicating that the disk was pushed from the lower side of the disk. All the observational results might be explained by a cloud collision with the Galactic disk.

    DOI: 10.1017/S1743921323002430

    Scopus

  • Hwang J., Kim J., Pattle K., Lee C.W., Koch P.M., Johnstone D., Tomisaka K., Whitworth A., Furuya R.S., Kang J.H., Lyo A.R., Chung E.J., Arzoumanian D., Park G., Kwon W., Kim S., Tamura M., Kwon J., Soam A., Han I., Hoang T., Kim K.H., Onaka T., Eswaraiah C., Ward-Thompson D., Liu H.L., Tang X., Chen W.P., Matsumura M., Hoang T.D., Chen Z., Le Gouellec V.J.M., Kirchschlager F., Poidevin F., Bastien P., Qiu K., Hasegawa T., Lai S.P., Byun D.Y., Cho J., Choi M., Choi Y., Choi Y., Jeong I.G., Kang M., Kim H., Kim K.T., Lee J.E., Lee S.S., Lee Y.H., Lee H., Kim M.R., Yoo H., Yun H.S., Chen M., Di Francesco J., Fiege J., Fissel L.M., Franzmann E., Houde M., Lacaille K., Matthews B., Sadavoy S., Moriarty-Schieven G., Tahani M., Ching T.C., Dai Y.S., Duan Y., Gu Q., Law C.Y., Li D., Li D., Li G., Li H.B., Liu T., Lu X., Qian L., Wang H., Wu J., Xie J., Yuan J., Zhang C.P., Zhang G., Zhang Y., Zhou J., Zhu L., Berry D., Friberg P., Graves S., Liu J., Mairs S., Parsons H., Rawlings M., Doi Y., Hayashi S., Hull C.L.H., Inoue T., Inutsuka S.I., Iwasaki K., Kataoka A. .  The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2 .  Astrophysical Journal941 ( 1 )   2022.12Reviewed

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    Language:Japanese   Publisher:Astrophysical Journal  

    We present and analyze observations of polarized dust emission at 850 μm toward the central 1 × 1 pc hub-filament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell Telescope (JCMT) as part of the B-fields in Star-forming Region Observations survey. The orientations of the magnetic field follow the spiral structure of Mon R2, which are well described by an axisymmetric magnetic field model. We estimate the turbulent component of the magnetic field using the angle difference between our observations and the best-fit model of the underlying large-scale mean magnetic field. This estimate is used to calculate the magnetic field strength using the Davis–Chandrasekhar–Fermi method, for which we also obtain the distribution of volume density and velocity dispersion using a column density map derived from Herschel data and the C18O (J = 3 - 2) data taken with HARP on the JCMT, respectively. We make maps of magnetic field strengths and mass-to-flux ratios, finding that magnetic field strengths vary from 0.02 to 3.64 mG with a mean value of 1.0 ± 0.06 mG, and the mean critical mass-to-flux ratio is 0.47 ± 0.02. Additionally, the mean Alfvén Mach number is 0.35 ± 0.01. This suggests that, in Mon R2, the magnetic fields provide resistance against large-scale gravitational collapse, and the magnetic pressure exceeds the turbulent pressure. We also investigate the properties of each filament in Mon R2. Most of the filaments are aligned along the magnetic field direction and are magnetically subcritical.

    DOI: 10.3847/1538-4357/ac99e0

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  • Ching T.C., Qiu K., Li D., Ren Z., Lai S.P., Berry D., Pattle K., Furuya R., Ward-Thompson D., Johnstone D., Koch P.M., Lee C.W., Hoang T., Hasegawa T., Kwon W., Bastien P., Eswaraiah C., Wang J.W., Kim K.H., Hwang J., Soam A., Lyo A.R., Liu J., Le Gouellec V.J.M., Arzoumanian D., Whitworth A., Di Francesco J., Poidevin F., Liu T., Coudé S., Tahani M., Liu H.L., Onaka T., Li D., Tamura M., Chen Z., Tang X., Kirchschlager F., Bourke T.L., Byun D.Y., Chen M., Chen H.R.V., Chen W.P., Cho J., Choi Y., Choi Y., Choi M., Chrysostomou A., Chung E.J., Dai Y.S., Diep P.N., Doi Y., Duan Y., Duan H.Y., Eden D., Fanciullo L., Fiege J., Fissel L.M., Franzmann E., Friberg P., Friesen R., Fuller G., Gledhill T., Graves S., Greaves J., Griffin M., Gu Q., Han I., Hayashi S., Houde M., Hull C.L.H., Inoue T., Inutsuka S.I., Iwasaki K., Jeong I.G., Könyves V., Kang J.H., Kang M., Karoly J., Kataoka A., Kawabata K., Kemper F., Kim J., Kim M.R., Kim S., Kim H., Kim K.T., Kim G., Kirk J., Kobayashi M.I.N., Kusune T., Kwon J., Lacaille K., Law C.Y., Lee S.S., Lee H., Lee J.E., Lee C.F., Lee Y.H., Li G. .  The JCMT BISTRO-2 Survey: Magnetic Fields of the Massive DR21 Filament .  Astrophysical Journal941 ( 2 )   2022.12Reviewed

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    Language:Japanese   Publisher:Astrophysical Journal  

    We present 850 μm dust polarization observations of the massive DR21 filament from the B-fields In STar-forming Region Observations (BISTRO) survey, using the POL-2 polarimeter and the SCUBA-2 camera on the James Clerk Maxwell Telescope. We detect ordered magnetic fields perpendicular to the parsec-scale ridge of the DR21 main filament. In the subfilaments, the magnetic fields are mainly parallel to the filamentary structures and smoothly connect to the magnetic fields of the main filament. We compare the POL-2 and Planck dust polarization observations to study the magnetic field structures of the DR21 filament on 0.1-10 pc scales. The magnetic fields revealed in the Planck data are well-aligned with those of the POL-2 data, indicating a smooth variation of magnetic fields from large to small scales. The plane-of-sky magnetic field strengths derived from angular dispersion functions of dust polarization are 0.6-1.0 mG in the DR21 filament and ∼0.1 mG in the surrounding ambient gas. The mass-to-flux ratios are found to be magnetically supercritical in the filament and slightly subcritical to nearly critical in the ambient gas. The alignment between column density structures and magnetic fields changes from random alignment in the low-density ambient gas probed by Planck to mostly perpendicular in the high-density main filament probed by James Clerk Maxwell Telescope. The magnetic field structures of the DR21 filament are in agreement with MHD simulations of a strongly magnetized medium, suggesting that magnetic fields play an important role in shaping the DR21 main filament and subfilaments.

    DOI: 10.3847/1538-4357/ac9dfb

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  • Nakanishi H., Furuhashi M., Nakahara S. .  Pre-integration Digital Spectrometer .  Asia-Pacific Microwave Conference Proceedings, APMC2022-November   590 - 592   2022Reviewed

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    Language:Japanese   Publisher:Asia-Pacific Microwave Conference Proceedings, APMC  

    A novel digital spectrometer is proposed aiming to reduce the number of numerical operations implemented on field-programmable gate arrays (FPGA). The novel model includes the Hilbert transformation, a semi-autocorrelation generation, and integration parts. If the integration number is sufficiently large, then the integrated semi-autocorrelation vector is equivalent to the autocorrelation function. A power spectrum is finally obtained by applying a fast Fourier transformation (FFT) to it. The proposed model requires less number of operations compared with the classical normal spectrometer. We tested the functioning of the new algorithm works using simulation data and implemented it on an FPGA.

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  • 中西 裕之, 山本 裕樹 .  インターネット望遠鏡ネットワーク(ITN)の紹介 .  理科通信 サイエンスネット74   14 - 15   2022インターネット望遠鏡ネットワーク(ITN)の紹介

  • Lyo A.R. .  The JCMT BISTRO survey: An 850/450μm polarization study of NGC 2071IR in Orion B .  Astrophysical Journal918 ( 2 )   2021.9Reviewed

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    Language:Japanese   Publisher:Astrophysical Journal  

    DOI: 10.3847/1538-4357/ac0ce9

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  • James O. Chibueze, Haruka Sakemi, Takumi Ohmura, Mami Machida, Hiroki Akamatsu, Takuya Akahori, Hiroyuki Nakanishi, Viral Parekh, Ruby van Rooyen, Tsutomu T. Takeuchi .  Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376 .  Nature593 ( 7857 ) 47 - 50   2021.5Reviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Galaxy clusters are known to harbour magnetic fields, the nature of which remains unresolved. Intra-cluster magnetic fields can be observed at the density contact discontinuity formed by cool and dense plasma running into hot ambient plasma1,2, and the discontinuity exists3 near the second-brightest galaxy4, MRC 0600-399, in the merging galaxy cluster Abell 3376 (redshift 0.0461). Elongated X-ray emission in the east–west direction shows a comet-like structure that reaches the megaparsec scale5. Previous radio observations6,7 detected the bent jets from MRC 0600-399, moving in same direction as the sub-cluster, against ram pressure. Here we report radio8,9 observations of MRC 0600-399 that have 3.4 and 11 times higher resolution and sensitivity, respectively, than the previous results6. In contrast to typical jets10,11, MRC 0600-399 shows a 90-degree bend at the contact discontinuity, and the collimated jets extend over 100 kiloparsecs from the point of the bend. We see diffuse, elongated emission that we name ‘double-scythe’ structures. The spectral index flattens downstream of the bend point, indicating cosmic-ray reacceleration. High-resolution numerical simulations reveal that the ordered magnetic field along the discontinuity has an important role in the change of jet direction. The morphology of the double-scythe jets is consistent with the simulations. Our results provide insights into the effect of magnetic fields on the evolution of the member galaxies and intra-cluster medium of galaxy clusters.

    DOI: 10.1038/s41586-021-03434-1

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  • Kurahara K. .  Large-scale magnetic field structure of NGC 3627 based on a magnetic vector map .  Publications of the Astronomical Society of Japan73 ( 1 ) 220 - 229   2021.2Reviewed

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    Language:Japanese   Publisher:Publications of the Astronomical Society of Japan  

    DOI: 10.1093/pasj/psaa116

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  • Hiroyuki Nakanishi, Shinji Fujita, Kengo Tachihara, Natsuko Izumi, Mitsuhiro Matsuo, Tomofumi Umemoto, Yumiko Oasa, Tsuyoshi Inoue .  FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN). VII. Molecular fraction of H i clouds .  Publications of the Astronomical Society of Japan72 ( 3 )   2020.6Reviewed

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    We analyze molecular-gas formation in neutral atomic hydrogen (H i) clouds using the latest CO data, obtained from the FOREST (four-beam receiver system on the 45 m telescope) unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope, and using H i data taken from the Very Large Array Galactic plane survey. We applied a dendrogram algorithm to the H i data cube to identify H i clouds, and we calculated the H i mass and molecular-gas mass by summing the CO line intensity within each H i cloud. On the basis of the results, we created a catalog of 5737 identified H i clouds with local standard of rest (LSR) velocity of VLSR ≤-20 km s-1 in galactic longitude and latitude ranges of 20° ≤ l ≤ 50° and-1° ≤ b ≤ 1°, respectively. We found that most of the H i clouds are distributed within a Galactocentric distance of 16 kpc, and most of them are in the cold neutral medium phase. In addition, we determined that the high-mass end of the H i mass function is fitted well with a power-law function with an index of 2.3. Although two sequences of self-gravitating and diffuse clouds are expected to appear in the M tot-$M-{\,{\rm H}-2}$ diagram according to previous works based on a plane-parallel model, the observational data show only a single sequence with large scattering within these two sequences. This implies that most of the clouds are mixtures of these two types of clouds. Moreover, we suggest the following scenario of molecular-gas formation: An H i-dominant cloud evolved with increasing H2 mass along a path of $M-{\,{\rm H}-2} \propto M-{\,\rm tot}^2$ by collecting diffuse gas before reaching and moving along the curves of the two sequences.

    DOI: 10.1093/pasj/psaa027

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  • Hiroyuki Nakanishi, Kohei Kurahara, Kenta Anraku .  Magnetic-field vector maps of nearby spiral galaxies .  Galaxies7 ( 1 ) 32   2019.2Reviewed

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    We present a method for determining the directions of magnetic-field vectors in a spiral galaxy using two synchrotron polarization maps, an optical image, and a velocity field. The orientation of the transverse magnetic field is determined with a synchrotron polarization map of a higher-frequency band, and the 180°-ambiguity is solved by using a sign of Rotation Measure (RM) after determining the geometrical orientation of a disk based on an assumption of trailing spiral arms. The advantage of this method is that the direction of a magnetic vector for each line of sight throughout the galaxy can inexpensively be determined, with easily available data and simple assumptions. We applied this method to three nearby spiral galaxies using archival data obtained with a Very Large Array (VLA) to demonstrate how it works. The three galaxies have both clockwise and counterclockwise magnetic fields, which implies that none of the three galaxies is classified in a simple Axis-Symmetric type, but types of higher modes, and that magnetic reversals commonly exist.

    DOI: 10.3390/galaxies7010032

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  • Hiroyuki Nakanishi, Yoshiaki Sofue .  Three-dimensional distribution of the ISM in the Milky Way galaxy. III. The total neutral gas disk .  Publications of the Astronomical Society of Japan68 ( 1 ) 5   2016.2Three-dimensional distribution of the ISM in the Milky Way galaxy. III. The total neutral gas diskReviewed

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Astronomical Society of Japan  

    We present newly obtained three-dimensional gaseous maps of the Milky Way Galaxy: H I, H2, and total-gas (H I plus H2) maps, which were derived from the H I and 12CO(J = 1-0) survey data and rotation curves based on the kinematic distance. The H I and H2 face-on maps show that the H I disk is extended to a radius of 15-20 kpc and its outskirts are asymmetric to the Galactic center, while most of the H2 gas is distributed inside the solar circle. The total gas mass within a radius of 30 kpc amounts to 8.0 × 109 M⊙, 89% and 11% of which are H I and H2, respectively. The vertical slices show that the outer H I disk is strongly warped and the inner H I and H2 disks are corrugated. The total gas map is advantageous for tracing spiral structures from the inner to outer disk. Spiral structures such as the Norma-Cygnus, the Perseus, the Sagittarius-Carina, the Scutum-Crux, and the Orion arms are more clearly traced in the total gas map than ever. All the spiral arms are well explained by logarithmic spiral arms with pitch angles of 11°-15°. The molecular fraction of the total gas is high near the Galactic center and decreases with Galactocentric distance. The molecular fraction is also locally enhanced at the spiral arms compared with the inter-arm regions.

    DOI: 10.1093/pasj/psv108

    arXiv

  • Hiroyuki Nakanishi, Nobuyuki Sakai, Tomoharu Kurayama, Mitsuhiro Matsuo, Hiroshi Imai, Ross A. Burns, Takeaki Ozawa, Mareki Honma, Katsunori Shibata, andNoriyuki Kawaguchi .  Outer Rotation Curve of the Galaxy with VERA II: Annual Parallax and Proper Motion of the Star-Forming Region IRAS21379+5106 .  Publications of the Astronomical Society of Japan   2015.1Outer Rotation Curve of the Galaxy with VERA II: Annual Parallax and Proper Motion of the Star-Forming Region IRAS21379+5106Reviewed

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  • Hiroyuki Nakanishi, Tomoka Tosaki, Kotaro Kohno, Yoshiaki Sofue, Nario Kuno .  ASTE 12CO(J= 3--2) Survey of Elliptical Galaxies .  Publications of the Astronomical Society of Japan59 ( 1 ) 61 - 65   2007.2ASTE 12CO(J= 3--2) Survey of Elliptical GalaxiesReviewed

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  • Hiroyuki Nakanishi, Nario Kuno, Yoshiaki Sofue, Naoko Sato, Naomasa Nakai, Yasuhiro Shioya, Tomoka Tosaki, Sachiko Onodera, Kazuo Sorai, Fumi Egusa, Akihiko Hirota .  Environmental Effects on Gaseous Disks of the Virgo Spiral Galaxies .  The Astrophysical Journal651 ( 2 ) 804 - 810   2006.11Environmental Effects on Gaseous Disks of the Virgo Spiral GalaxiesReviewed

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  • Hiroyuki Nakanishi, Yoshiaki Sofue .  Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: II. The Molecular Gas Disk .  Publications of the Astronomical Society of Japan58 ( 5 ) 847 - 860   2006.10Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: II. The Molecular Gas DiskReviewed

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  • Hiroyuki Nakanishi, Yoshiaki Sofue, Jin Koda .  Virgo High-Resolution CO Survey: V. Circumnuclear Elliptical Ring in NGC 4569 .  Publications of the Astronomical Society of Japan57 ( 6 ) 905 - 916   2005.12Virgo High-Resolution CO Survey: V. Circumnuclear Elliptical Ring in NGC 4569Reviewed

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  • Hiroyuki Nakanishi & Yoshiaki Sofue .  Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: I. The H I Disk .  Publications of the Astronomical Society of Japan55 ( 1 ) 191 - 202   2003.2Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: I. The H I DiskReviewed

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  • Derek Ward-Thompson, Janik Karoly, Kate Pattle, Anthony Whitworth, Jason Kirk, David Berry, Pierre Bastien, Tao-Chung Ching, Simon Coudé, Jihye Hwang, Woojin Kwon, Archana Soam, Jia-Wei Wang, Tetsuo Hasegawa, Shih-Ping Lai, Keping Qiu, Doris Arzoumanian, Tyler L. Bourke, Do-Young Byun, Huei-Ru Vivien Chen, Wen Ping Chen, Mike Chen, Zhiwei Chen, Jungyeon Cho, Minho Choi, Youngwoo Choi, Yunhee Choi, Antonio Chrysostomou, Eun Jung Chung, Sophia Dai, Victor Debattista, James Di Francesco, Pham Ngoc Diep, Yasuo Doi, Hao-Yuan Duan, Yan Duan, Chakali Eswaraiah, Lapo Fanciullo, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Ray Furuya, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Saeko Hayashi, Thiem Hoang, Martin Houde, Charles L. H. Hull, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Doug Johnstone, Vera Könyves, Ji-hyun Kang, Miju Kang, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Jongsoo Kim, Shinyoung Kim, Gwanjeong Kim, Kyoung Hee Kim, Mi-Ryang Kim, Kee-Tae Kim, Hyosung Kim, Florian Kirchschlager, Masato I. N. Kobayashi, Patrick M. Koch, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Chi-Yan Law, Chang Won Lee, Hyeseung Lee, Yong-Hee Lee, Chin-Fei Lee, Jeong-Eun Lee, Sang-Sung Lee, Dalei Li, Di Li, Guangxing Li, Hua-bai Li, Sheng-Jun Lin, Hong-Li Liu, Tie Liu, Sheng-Yuan Liu, Junhao Liu, Steven Longmore, Xing Lu, A-Ran Lyo, Steve Mairs, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Takashi Onaka, Geumsook Park, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-Soo Pyo, Lei Qian, Ramprasad Rao, Jonathan Rawlings, Mark Rawlings, Brendan Retter, John Richer, Andrew Rigby, Sarah Sadavoy, Hiro Saito, Giorgio Savini, Masumichi Seta, Yoshito Shimajiri, Hiroko Shinnaga, Mehrnoosh Tahani, Motohide Tamura, Ya-Wen Tang, Xindi Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Hongchi Wang, Jintai Wu, Jinjin Xie, Meng-Zhe Yang, Hsi-Wei Yen, Hyunju Yoo, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Guoyin Zhang, Yapeng Zhang, Chuan-Peng Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Philippe André, C. Darren Dowell, David Eden, Stewart Eyres, Sam Falle, Valentin J. M. Le Gouellec, Frédérick Poidevin, Jean-François Robitaille, Sven van Loo .  First BISTRO Observations of the Dark Cloud Taurus L1495A-B10: The Role of the Magnetic Field in the Earliest Stages of Low-mass Star Formation .  The Astrophysical Journal946 ( 2 ) 62 - 62   2023.4Reviewed

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    We present BISTRO Survey 850 μm dust emission polarization observations of the L1495A-B10 region of the Taurus molecular cloud, taken at the James Clerk Maxwell Telescope (JCMT). We observe a roughly triangular network of dense filaments. We detect nine of the dense starless cores embedded within these filaments in polarization, finding that the plane-of-sky orientation of the core-scale magnetic field lies roughly perpendicular to the filaments in almost all cases. We also find that the large-scale magnetic field orientation measured by Planck is not correlated with any of the core or filament structures, except in the case of the lowest-density core. We propose a scenario for early prestellar evolution that is both an extension to, and consistent with, previous models, introducing an additional evolutionary transitional stage between field-dominated and matter-dominated evolution, observed here for the first time. In this scenario, the cloud collapses first to a sheet-like structure. Uniquely, we appear to be seeing this sheet almost face on. The sheet fragments into filaments, which in turn form cores. However, the material must reach a certain critical density before the evolution changes from being field dominated to being matter dominated. We measure the sheet surface density and the magnetic field strength at that transition for the first time and show consistency with an analytical prediction that had previously gone untested for over 50 yr.

    DOI: 10.3847/1538-4357/acbea4

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  • James O. Chibueze, Hiroki Akamatsu, Viral Parekh, Haruka Sakemi, Takumi Ohmura, Ruby van Rooyen, Takuya Akahori, Hiroyuki Nakanishi, Mami Machida, Tsutomu T. Takeuchi, Oleg Smirnov, Dane Kleiner, Filippo M. Maccagni .  MeerKAT's view of double radio relic galaxy cluster Abell 3376 .  PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN75   S97 - S107   2022.3Reviewed

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    We present the initial results of our MeerKAT L-band observations of Abell 3376. We achieved higher (5 '') angular resolution and better (similar to 4 mu Jy beam(-1)) sensitivity compared to the previous observations. Our achieved sensitivity is only a factor of 2 larger than the thermal noise of MeerKAT. Astrometric and flux comparison of discrete compact sources in the field between MeerKAT and the Very Large Array (VLA) indicated that our calibration procedures were successful. We detected West and East relics, and radio galaxies, which have been observed in previous works. With minimal missing flux problem in our MeerKAT observations, we derived the spectral indices of the West relic (-1.22 +/- 0.05), East relic (-1.33 +/- 0.08) and central radio galaxies (-0.94 +/- 0.05). The improved images revealed faint, extending radio arcs for relics, and connection between the East relic and radio galaxies. It is probable that (at least some of) the re-accelerated electrons of the East relic are supplied by the jets of the radio galaxies. No significant diffuse radio emission was found in cluster central part, supporting previous works with a much better upper limit of radio flux of <1.8 x 10(23) W Hz(-1).

    DOI: 10.1093/pasj/psac009

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  • Nobuyuki Sakai, Hiroyuki Nakanishi, Kohei Kurahara, Daisuke Sakai, Kazuya Hachisuka, Jeong Sook Kim, Osamu Kameya .  VERA astrometry toward the Perseus arm gap .  Publications of the Astronomical Society of Japan74 ( 1 ) 209 - 223   2022.2Reviewed

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    The Perseus arm has a gap in Galactic longitudes (l) between 50° and 80° (hereafter the Perseus arm gap) where the arm has little star formation activity. To better understand the gap, we conducted astrometric observations with VERA (VLBI Exploration of Radio Astrometry) and analyzed archival H i data. We report on parallax and proper motion results from four star-forming regions, of which G050.28-00.39 and G070.33+01.59 are likely associated with the gap. The measured parallaxes are 0.140 ± 0.018 (mas), 0.726 ± 0.038 (mas), 0.074 ± 0.037 (mas), and 0.118 ± 0.035 (mas) for G050.28-00.39, G053.14+00.07, G070.33+01.59, and G079.08+01.33, respectively. Since the fractional parallax error of G070.33+01.59 is large (0.5), we estimated a 3D kinematic distance of the source of 7.7 ± 1.0 kpc using both the LSR velocity (VLSR) and the measured proper motion. Perseus-arm sources G049.41+00.32 and G050.28-00.39 lag relative to a Galactic rotation by 77 ± 17 km s-1 and 31 ± 10 km s-1, respectively. The noncircular motion of G049.41+00.32 cannot be explained by the gravitational potential of the Perseus arm. We discovered rectangular holes with integrated brightness temperatures of <30 K arcdeg in l vs. VLSR of the H i data. One of the holes is centered near (l, VLSR) = (47°, -15 km s-1), and G049.41+00.32 is associated with the rim of the hole. However, G050.28-00.39 is not associated with the hole. We found extended H i emission on one side of the Galactic plane when integrating the H i data over the velocity range covering the hole (i.e., VLSR = [-25, -5] km s-1). G049.41+00.32 and G050.28-00.39 are moving toward the emission. The Galactic H i disk at the same velocity range showed an arc structure, indicating that the disk was pushed from the lower side of the disk. All the observational results might be explained by a cloud collision with the Galactic disk.

    DOI: 10.1093/pasj/psab118

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  • Woojin Kwon, Kate Pattle, Sarah Sadavoy, Charles L.H. Hull, Doug Johnstone, Derek Ward-Thompson, James Di Francesco, Patrick M. Koch, Ray Furuya, Yasuo Doi, Valentin J.M. Le Gouellec, Jihye Hwang, A. Ran Lyo, Archana Soam, Xindi Tang, Thiem Hoang, Florian Kirchschlager, Chakali Eswaraiah, Lapo Fanciullo, Kyoung Hee Kim, Takashi Onaka, Vera Könyves, Ji Hyun Kang, Chang Won Lee, Motohide Tamura, Pierre Bastien, Tetsuo Hasegawa, Shih Ping Lai, Keping Qiu, David Berry, Doris Arzoumanian, Tyler L. Bourke, Do Young Byun, Wen Ping Chen, Huei Ru Vivien Chen, Mike Chen, Zhiwei Chen, Tao Chung Ching, Jungyeon Cho, Yunhee Choi, Minho Choi, Antonio Chrysostomou, Eun Jung Chung, Simon Coudé, Sophia Dai, Pham Ngoc Diep, Yan Duan, Hao Yuan Duan, David Eden, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Jennifer Hatchell, Saeko Hayashi, Martin Houde, Tsuyoshi Inoue, Shu Ichiro Inutsuka, Kazunari Iwasaki, Il Gyo Jeong, Miju Kang, Janik Karoly, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Kee Tae Kim, Gwanjeong Kim, Mi Ryang Kim, Shinyoung Kim, Jongsoo Kim, Jason Kirk, Masato I.N. Kobayashi, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Chi Yan Law, Chin Fei Lee, Yong Hee Lee, Hyeseung Lee, Jeong Eun Lee, Sang Sung Lee, Dalei Li, Di Li, Hua Bai Li, Sheng Jun Lin, Sheng Yuan Liu, Hong Li Liu, Junhao Liu, Tie Liu, Xing Lu, Steve Mairs, Masafumi Matsumura .  B-fields in Star-forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main .  Astrophysical Journal926 ( 2 ) 163 - 163   2022Reviewed International coauthorship

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    We present 850 μm polarimetric observations toward the Serpens Main molecular cloud obtained using the POL-2 polarimeter on the James Clerk Maxwell Telescope as part of the B-fields In STar-forming Region Observations survey. These observations probe the magnetic field morphology of the Serpens Main molecular cloud on about 6000 au scales, which consists of cores and six filaments with different physical properties such as density and star formation activity. Using the histogram of relative orientation (HRO) technique, we find that magnetic fields are parallel to filaments in less-dense filamentary structures where NH2<0.93×1022 cm-2 (magnetic fields perpendicular to density gradients), while they are perpendicular to filaments (magnetic fields parallel to density gradients) in dense filamentary structures with star formation activity. Moreover, applying the HRO technique to denser core regions, we find that magnetic field orientations change to become perpendicular to density gradients again at NH2≈4.6×1022 cm-2. This can be interpreted as a signature of core formation. At NH2≈16×1022 cm-2, magnetic fields change back to being parallel to density gradients once again, which can be understood to be due to magnetic fields being dragged in by infalling material. In addition, we estimate the magnetic field strengths of the filaments (B POS = 60-300 μG)) using the Davis-Chandrasekhar-Fermi method and discuss whether the filaments are gravitationally unstable based on magnetic field and turbulence energy densities.

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  • Hiroaki Yamamoto, Ryuji Okamoto, Yasuhiro Murata, Hiroyuki Nakanishi, Hiroshi Imai, Kohei Kurahara .  Physical properties of the molecular cloud, N4, in SS 433: Evidence for an interaction of molecular cloud with the jet from SS 433 .  PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN74 ( 3 ) 493 - 509   2022Reviewed

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    We conducted observations and analyses of the molecular cloud, N4, which is located at similar to 40 pc from SS 433 and the same line of sight as that of the radio shell, in (CO)-C-12(J = 1-0), (CO)-C-12(J = 3-2), (CO)-C-13(J = 3-2), and grand-state OH emissions. N4 has a strong gradient of the integrated intensity of (CO)-C-12(J = 1-0, 3-2) emission at the northern, eastern, and western edges. The main body of N4 also has a velocity gradient of similar to 0.16 km s(-1) (20")(-1). A velocity shift by up to 3 km s(-1) from the systemic velocity at similar to 49 km s(-1) is detected at only the northwestern part of N4. The volume density of the molecular hydrogen gas and the kinematic temperature are estimated at eight local peaks of (CO)-C-12(J = 1-0) and (CO)-C-13(J = 3-2) emissions by the RADEX code. The calculated n((H2)) is an order of 10(3) cm(-3), and T-k ranges from similar to 20 to similar to 56 K. The mass of N4 is estimated to be similar to 7300 M-circle dot. The thermal and turbulent pressures in N4 are estimated to be similar to 10(5) K cm(-3) and similar to 10(7) K cm(-3), respectively. The relation of the thermal and turbulent pressures in N4 tends to be similar to that of the molecular clouds in the Galactic plane. However, these values are higher than those in the typical molecular clouds in the Galactic plane. Several pieces of circumstantial evidence representing the physical properties of N4 and comparison with the data of infrared and X-ray radiation suggest that N4 is interacting with a jet from SS 433. However, no gamma-ray radiation is detected toward N4. Compared to the previous study, it is hard to detect the gamma-ray radiation by cosmic-ray proton origin due to the low sensitivity of the current gamma-ray observatories. No OH emission was detected toward N4 due to the low sensitivity of the observation and antenna beam dilution.

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  • Eswaraiah C. .  The JCMT BISTRO Survey: Revealing the Diverse Magnetic Field Morphologies in Taurus Dense Cores with Sensitive Submillimeter Polarimetry .  Astrophysical Journal Letters912 ( 2 )   2021.5Reviewed

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    Publisher:Astrophysical Journal Letters  

    DOI: 10.3847/2041-8213/abeb1c

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  • Arzoumanian D. .  Dust polarized emission observations of NGC 6334: BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network .  Astronomy and Astrophysics647   2021.3Reviewed

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    Publisher:Astronomy and Astrophysics  

    DOI: 10.1051/0004-6361/202038624

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  • Ngoc N.B. .  Observations of magnetic fields surrounding LkHa 101 taken by the BISTRO survey with JCMT-POL-2 .  Astrophysical Journal908 ( 1 )   2021.2Reviewed

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    DOI: 10.3847/1538-4357/abd0fc

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  • Doi Y. .  The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333 .  Astrophysical Journal899 ( 1 )   2020.8Reviewed

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    DOI: 10.3847/1538-4357/aba1e2

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  • Tomoya Hirota, Takumi Nagayama, Mareki Honma, Yuuki Adachi, Ross A. Burns, James O. Chibueze, Yoon Kyung Choi, Kazuya Hachisuka, Kazuhiro Hada, Yoshiaki Hagiwara, Shota Hamada, Toshihiro Handa, Mao Hashimoto, Ken Hirano, Yushi Hirata, Takanori Ichikawa, Hiroshi Imai, Daichi Inenaga, Toshio Ishikawa, Takaaki Jike, Osamu Kameya, Daichi Kaseda, Jeong Sook Kim, Jungha Kim, Mi Kyoung Kim, Hideyuki Kobayashi, Yusuke Kono, Tomoharu Kurayama, Masako Matsuno, Atsushi Morita, Kazuhito Motogi, Takeru Murase, Akiharu Nakagawa, Hiroyuki Nakanishi, Kotaro Niinuma, Junya Nishi, Chung Sik Oh, Toshihiro Omodaka, Miyako Oyadomari, Tomoaki Oyama, Daisuke Sakai, Nobuyuki Sakai, Satoko Sawada-Satoh, Katsunori M. Shibata, Makoto Shizugami, Jumpei Sudo, Koichiro Sugiyama, Kazuyoshi Sunada, Syunsaku Suzuki, Ken Takahashi, Yoshiaki Tamura, Fumie Tazaki, Yuji Ueno, Yuri Uno, Riku Urago, Koji Wada, Yuan Wei Wu, Kazuyoshi Yamashita, Yuto Yamashita, Aya Yamauchi, Akito Yuda .  The first VERA astrometry catalog .  Publications of the Astronomical Society of Japan72 ( 4 )   2020.8Reviewed

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    We present the first astrometry catalog from the Japanese VLBI (very long baseline interferometer) project VERA (VLBI Exploration of Radio Astrometry). We have compiled all the astrometry results from VERA, providing accurate trigonometric-annual-parallax and proper-motion measurements. In total, 99 maser sources are listed in the VERA catalog. Among them, 21 maser sources are newly reported, while the rest of the 78 sources are referred to in previously published results or those in preparation for forthcoming papers. The accuracy in the VERA astrometry is revisited and compared with that from the other VLBI astrometry projects such as BeSSeL (The Bar and Spiral Structure Legacy) Survey and GOBELINS (the Gould's Belt Distances Survey) with the VLBA (Very Long Baseline Array). We have confirmed that most of the astrometry results are consistent with each other, and the largest error sources are due to source structure of the maser features and their rapid variation, along with the systematic calibration errors and different analysis methods. Combined with the BeSSeL results, we estimate the up-to-date fundamental Galactic parameters of R0 = 7.92 ± 0.16stat. ± 0.3sys. kpc and Ω☉ = 30.17 ± 0.27stat. ± 0.3sys. km s−1 kpc−1, where R0 and Ω☉ are the distance from the Sun to the Galactic center and the Sun's angular velocity of the Galactic circular rotation, respectively.

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  • Koide, Nagito; Nakanishi, Hiroyuki; Sakai, Nobuyuki; Habe, Asao; Shima, Kazuhiro; Kurayama, Tomoharu; Matsuo, Mitsuhiro; Tezuka, Daisuke; Kurahara, Kohei; Ueno, Saeko; Burns, Ross A.; Nakagawa, Akiharu; Honma, Mareki; Shibata, Katsunori M.; Nagayama, Takumi; Kawaguchi, Noriyuki .  Outer rotation curve of the Galaxy with VERA IV: Astrometry of IRAS 01123+6430 and the possibility of cloud-cloud collision .  Publications of the Astronomical Society of Japan71   113   2019.12Outer rotation curve of the Galaxy with VERA IV: Astrometry of IRAS 01123+6430 and the possibility of cloud-cloud collisionReviewed

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    DOI: 10.1093/pasj/psz0101

  • Nobuyuki Sakai, Takumi Nagayama, Hiroyuki Nakanishi, Nagito Koide, Tomoharu Kurayama, Natsuko Izumi, Tomoya Hirota, Toshihiro Yoshida, Katsunori M. Shibata, Mareki Honma .  Vertical structure and kinematics of the Galactic outer disk .  Publications of the Astronomical Society of Japanin press ( 4 ) online   2019.12Reviewed

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    We report on measurements of parallax and proper motion for four 22 GHz water maser sources as part of the VERA Outer Rotation Curve project. All the sources show Galactic latitudes of >2◦ and Galactocentric distances of >11 kpc at the Galactic longitude range of 95◦ < l < 126◦. The sources trace the Galactic warp reaching to 200-400 pc, and also the signature of the warp to 600 pc toward the north Galactic pole. The new results, along with previous results in the literature, show that the maximum height of the Galactic warp increases with Galactocentric distance. Also, we examined velocities perpendicular to the disk for the sample, and found oscillatory behavior between the vertical velocities and Galactic heights. This behavior suggests the existence of bending (vertical density) waves, possibly induced by a perturbing satellite (e.g., the passage of the Sagittarius dwarf galaxy).

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  • Salak, Dragan, Noma, Yuto, Sorai, Kazuo, Miyamoto, Yusuke, Kuno, Nario, Pettitt, Alex R., Kaneko, Hiroyuki, Tanaka, Takahiro, Yasuda, Atsushi, Kita, Shoichiro, Yajima, Yoshiyuki, Shibata, Shugo, Nakai, Naomasa, Seta, Masumichi, Muraoka, Kazuyuki, Kuroda, Mayu, Nakanishi, Hiroyuki, Takeuchi, Tsutomu T., Yoda, Moe, Morokuma-Matsui, Kana, Watanabe, Yoshimasa, Matsumoto, Naoko, Oi, Nagisa, Pan, Hsi-An, Kajikawa, Ayumi, Yashima, Yu, Komatsuzaki, Ryusei .  CO Multi-line Imaging of Nearby Galaxies (COMING). VII. Fourier decomposition of molecular gas velocity fields and bar pattern speed .  Publications of the Astronomical Society of Japan71   S16   2019.12Reviewed

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    The <SUP>12</SUP>CO (J = 1→0) velocity fields of a sample of 20 nearby spiral galaxies, selected from the CO Multi-line Imaging of Nearby Galaxies (COMING) legacy project of Nobeyama Radio Observatory, have been analyzed by Fourier decomposition to determine their basic kinematic properties, such as circular and noncircular velocities. On average, the investigated barred (SAB and SB) galaxies exhibit a ratio of noncircular to circular velocities of molecular gas larger by a factor of 1.5-2 than non-barred (SA) spiral galaxies at radii within the bar semimajor axis a<SUB>b</SUB> at 1 kpc resolution, with a maximum at a radius of R/a<SUB>b</SUB> ≈ 0.3. Residual velocity field images, created by subtracting model velocity fields from the data, reveal that this trend is caused by kpc-scale streaming motions of molecular gas in the bar region. Applying a new method based on radial velocity reversal, we estimated the corotation radius R<SUB>CR</SUB> and bar pattern speed Ω<SUB>b</SUB> in seven SAB and SB systems. The ratio of the corotation to bar radius is found to be in a range of R≡ R_CR/a_b ≈ 0.8-1.6, suggesting that intermediate (SBb-SBc), luminous barred spiral galaxies host fast and slow rotator bars. Tentative negative correlations are found for Ω<SUB>b</SUB> vs. a<SUB>b</SUB> and Ω<SUB>b</SUB> vs. total stellar mass M<SUB>*</SUB>, indicating that bars in massive disks are larger and rotate slower, possibly a consequence of angular momentum transfer. The kinematic properties of SAB and SB galaxies, derived from Fourier decomposition, are compared with recent numerical simulations that incorporate various rotation curve models and galaxy interactions....

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  • Muraoka, Kazuyuki; Sorai, Kazuo; Miyamoto, Yusuke; Yoda, Moe; Morokuma-Matsui, Kana; Kobayashi, Masato I. N.; Kuroda, Mayu; Kaneko, Hiroyuki; Kuno, Nario; Takeuchi, Tsutomu T.; Nakanishi, Hiroyuki; Watanabe, Yoshimasa; Tanaka, Takahiro; Yasuda, Atsushi; Yajima, Yoshiyuki; Shibata, Shugo; Salak, Dragan; Espada, Daniel; Matsumoto, Naoko; Noma, Yuto; Kita, Shoichiro; Komatsuzaki, Ryusei; Kajikawa, Ayumi; Yashima, Yu; Pan, Hsi-An; Oi, Nagisa; Seta, Masumichi; Nakai, Naomasa .  CO Multi-line Imaging of Nearby Galaxies (COMING). VI. Radial variations in star formation efficiency .  Publications of the Astronomical Society of Japan71   S15   2019.12Reviewed

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    DOI: 10.1093/pasj/psz015

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  • Yajima, Yoshiyuki, Sorai, Kazuo, Kuno, Nario, Muraoka, Kazuyuki, Miyamoto, Yusuke, Kaneko, Hiroyuki, Nakanishi, Hiroyuki, Nakai, Naomasa, Tanaka, Takahiro, Sato, Yuya, Salak, Dragan, Morokuma-Matsui, Kana, Matsumoto, Naoko, Pan, Hsi-An, Noma, Yuto, Takeuchi, Tsutomu T., Yoda, Moe, Kuroda, Mayu, Yasuda, Atsushi, Oi, Nagisa, Shibata, Shugo, Seta, Masumichi, Watanabe, Yoshimasa, Kita, Shoichiro, Komatsuzaki, Ryusei, Kajikawa, Ayumi, Yashima, Yu .  CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303 .  Publications of the Astronomical Society of Japan71   S13   2019.12Reviewed

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    We present the results of ^{12}CO(J = 1-0) and ^{13}CO(J = 1-0) simultaneous mappings toward the nearby barred spiral galaxy NGC 4303 as part of the CO Multi-line Imaging of Nearby Galaxies (COMING) project. Barred spiral galaxies often show lower star-formation efficiency (SFE) in their bar region compared to the spiral arms. In this paper, we examine the relation between the SFEs and the volume densities of molecular gas n(H<SUB>2</SUB>) in the eight different regions within the galactic disk with CO data combined with archival far-ultraviolet and 24 μm data. We confirmed that SFE in the bar region is lower by 39% than that in the spiral arms. Moreover, velocity-alignment stacking analysis was performed for the spectra in the individual regions. Integrated intensity ratios of ^{12}CO to ^{13}CO (R<SUB>12/13</SUB>) ranging from 10 to 17 were the results of this stacking. Fixing a kinetic temperature of molecular gas, n({H_2}) was derived from R<SUB>12/13</SUB> via non-local thermodynamic equilibrium (non-LTE) analysis. The density n(H<SUB>2</SUB>) in the bar is lower by 31%-37% than that in the arms and there is a rather tight positive correlation between SFEs and n(H<SUB>2</SUB>), with a correlation coefficient of ̃0.8. Furthermore, we found a dependence of n({H}_2) on the velocity dispersion of inter-molecular clouds (∆V/sin i). Specifically, n(H<SUB>2</SUB>) increases as ∆V/sin i increases when ∆V/sin i &lt; 100 km s<SUP>-1</SUP>. On the other hand, n(H<SUB>2</SUB>) decreases as ∆V/sin i increases when ∆V/sin i &gt; 100 km s<SUP>-1</SUP>. These relations indicate that the variations of SFE could be caused by the volume densities of molecular gas, and the volume densities could be governed by the dynamical influence such as cloud-cloud collisions, shear, and enhanced inner-cloud turbulence....

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  • Sorai, Kazuo; Kuno, Nario; Muraoka, Kazuyuki; Miyamoto, Yusuke; Kaneko, Hiroyuki; Nakanishi, Hiroyuki; Nakai, Naomasa; Yanagitani, Kazuki; Tanaka, Takahiro; Sato, Yuya; Salak, Dragan; Umei, Michiko; Morokuma-Matsui, Kana; Matsumoto, Naoko; Ueno, Saeko; Pan, Hsi-An; Noma, Yuto; Takeuchi, Tsutomu T.; Yoda, Moe; Kuroda, Mayu Yasuda, Atsushi; Yajima, Yoshiyuki; Oi, Nagisa; Shibata, Shugo; Seta, Masumichi; Watanabe, Yoshimasa; Kita, Shoichiro; Komatsuzaki, Ryusei; Kajikawa, Ayumi; Yashima, Yu; Cooray, Suchetha; Baji, Hiroyuki; Segawa, Yoko; Tashiro, Takami; Takeda, Miho; Kishida, Nozomi; Hatakeyama, Takuya; Tomiyasu, Yuto; Saita, Chey .  CO Multi-line Imaging of Nearby Galaxies (COMING) IV. Overview of the Project .  Publications of the Astronomical Society of Japan71   14   2019.12Reviewed

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    DOI: 10.1093/pasj/psz115

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  • The B-Fields In Star-Forming Regions Observations bistro Collaboration, Simon Coudé, Pierre Bastien, Martin Houde, Sarah Sadavoy, Rachel Friesen, James Di Francesco, Doug Johnstone, Steve Mairs, Tetsuo Hasegawa, Woojin Kwon, Shih Ping Lai, Keping Qiu, Derek Ward-Thompson, David Berry, Michael Chun Yuan Chen, Jason Fiege, Erica Franzmann, Jennifer Hatchell, Kevin Lacaille, Brenda C. Matthews, Gerald H. Moriarty-Schieven, Andy Pon, Philippe André, Doris Arzoumanian, Yusuke Aso, Do Young Byun, Chakali Eswaraiah, Huei Ru Chen, Wen Ping Chen, Tao Chung Ching, Jungyeon Cho, Minho Choi, Antonio Chrysostomou, Eun Jung Chung, Yasuo Doi, Emily Drabek-Maunder, C. Darren Dowell, Stewart P.S. Eyres, Sam Falle, Per Friberg, Gary Fuller, Ray S. Furuya, Tim Gledhill, Sarah F. Graves, Jane S. Greaves, Matt J. Griffin, Qilao Gu, Saeko S. Hayashi, Thiem Hoang, Wayne Holland, Tsuyoshi Inoue, Shu Ichiro Inutsuka, Kazunari Iwasaki, Il Gyo Jeong, Yoshihiro Kanamori, Akimasa Kataoka, Ji Hyun Kang, Miju Kang, Sung Ju Kang, Koji S. Kawabata, Francisca Kemper, Gwanjeong Kim, Jongsoo Kim, Kee Tae Kim, Kyoung Hee Kim, Mi Ryang Kim, Shinyoung Kim, Jason M. Kirk, Masato I.N. Kobayashi, Patrick M. Koch, Jungmi Kwon, Jeong Eun Lee, Chang Won Lee, Sang Sung Lee, Dalei Li, Di Li, Hua Bai Li, Hong Li Liu, Junhao Liu, Sheng Yuan Liu, Tie Liu, Sven Van Loo, A. Ran Lyo, Masafumi Matsumura, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nagayoshi Ohashi, Takashi Onaka, Harriet Parsons, Kate Pattle, Nicolas Peretto, Tae Soo Pyo, Lei Qian, Ramprasad Rao, Mark G. Rawlings, Brendan Retter, John Richer, Andrew Rigby .  The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region .  Astrophysical Journal877 ( 2 ) 88   2019.6Reviewed

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    We present the POL-2 850 μm linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations survey at the James Clerk Maxwell Telescope. We find a trend of decreasing polarization fraction as a function of total intensity, which we link to depolarization effects toward higher-density regions of the cloud. We then use the polarization data at 850 μm to infer the plane-of-sky orientation of the large-scale magnetic field in Barnard 1. This magnetic field runs north-south across most of the cloud, with the exception of B1-c, where it turns more east-west. From the dispersion of polarization angles, we calculate a turbulence correlation length of 5.0 ±2.″5 (1500 au) and a turbulent-to-total magnetic energy ratio of 0.5 ±0.3 inside the cloud. We combine this turbulent-to-total magnetic energy ratio with observations of NH3 molecular lines from the Green Bank Ammonia Survey to estimate the strength of the plane-of-sky component of the magnetic field through the Davis-Chandrasekhar-Fermi method. With a plane-of-sky amplitude of 120 ±60 μG and a criticality criterion λ c = 3.0 ±1.5, we find that Barnard 1 is a supercritical molecular cloud with a magnetic field nearly dominated by its turbulent component.

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  • Liu J. .  The JCMT BISTRO Survey: The Magnetic Field in the Starless Core ρ Ophiuchus C .  Astrophysical Journal877 ( 1 )   2019.5Reviewed

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    DOI: 10.3847/1538-4357/ab0958

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  • Jia Wei Wang, Shih Ping Lai, Chakali Eswaraiah, Kate Pattle, James Di Francesco, Doug Johnstone, Patrick M. Koch, Tie Liu, Motohide Tamura, Ray S. Furuya, Takashi Onaka, Derek Ward-Thompson, Archana Soam, Kee Tae Kim, Chang Won Lee, Chin Fei Lee, Steve Mairs, Doris Arzoumanian, Gwanjeong Kim, Thiem Hoang, Jihye Hwang, Sheng Yuan Liu, David Berry, Pierre Bastien, Tetsuo Hasegawa, Woojin Kwon, Keping Qiu, Philippe André, Yusuke Aso, Do Young Byun, Huei Ru Chen, Michael C. Chen, Wen Ping Chen, Tao Chung Ching, Jungyeon Cho, Minho Choi, Antonio Chrysostomou, Eun Jung Chung, Simon Coudé, Yasuo Doi, C. Darren Dowell, Emily Drabek-Maunder, Hao Yuan Duan, Stewart P.S. Eyres, Sam Falle, Lapo Fanciullo, Jason Fiege, Erica Franzmann, Per Friberg, Rachel K. Friesen, Gary Fuller, Tim Gledhill, Sarah F. Graves, Jane S. Greaves, Matt J. Griffin, Qilao Gu, Ilseung Han, Jennifer Hatchell, Saeko S. Hayashi, Wayne Holland, Martin Houde, Tsuyoshi Inoue, Shu Ichiro Inutsuka, Kazunari Iwasaki, Il Gyo Jeong, Yoshihiro Kanamori, Ji Hyun Kang, Miju Kang, Sung Ju Kang, Akimasa Kataoka, Koji S. Kawabata, Francisca Kemper, Jongsoo Kim, Kyoung Hee Kim, Mi Ryang Kim, Shinyoung Kim, Jason M. Kirk, Masato I.N. Kobayashi, Vera Konyves, Jungmi Kwon, Kevin M. Lacaille, Hyeseung Lee, Jeong Eun Lee, Sang Sung Lee, Yong Hee Lee, Dalei Li, Di Li, Hua Bai Li, Hong Li Liu, Junhao Liu, A. Ran Lyo, Masafumi Matsumura, Brenda C. Matthews, Gerald H. Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nagayoshi Ohashi, Geumsook Park, Harriet Parsons .  JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146 .  Astrophysical Journal876 ( 1 )   2019.5Reviewed

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    We present the 850 μm polarization observations toward the IC 5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on the James Clerk Maxwell Telescope, as part of the B-fields In STar forming Regions Observations. This work is aimed at revealing the magnetic field morphology within a core-scale (≲1.0 pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether the observed polarization traces the magnetic field in the HFS, we analyze the dependence between the observed polarization fraction and total intensity using a Bayesian approach with the polarization fraction described by the Rice likelihood function, which can correctly describe the probability density function of the observed polarization fraction for low signal-to-noise ratio data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in A V ∼ 20-300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC 5146 regions. Our polarization maps reveal a curved magnetic field, possibly dragged by the contraction along the parsec-scale filament. We further obtain a magnetic field strength of 0.5 ±; 0.2 mG toward the central hub using the Davis-Chandrasekhar-Fermi method, corresponding to a mass-to-flux criticality of ∼1.3 ±; 0.4 and an Alfvénic Mach number of <0.6. These results suggest that gravity and magnetic field are currently of comparable importance in the HFS and that turbulence is less important.

    DOI: 10.3847/1538-4357/ab13a2

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  • Kohei Kurahara, Hiroyuki Nakanishi .  Magnetic field vector structure of NGC6946 .  Galaxies7 ( 2 ) 59   2019.5Reviewed

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    We studied large-scale magnetic field reversals of a galaxy based on a magnetic vector map of NGC6946. The magnetic vector map was constructed based on the polarization maps in the C and X bands after the determination of the geometrical orientation of a disk with the use of an infrared image and the velocity field, according to the trailing spiral arm assumption. We examined the azimuthal variation of the magnetic vector and found that the magnetic pitch angle changes continually as a function of the azimuthal angle in the inter-arm region. However, the direction of the magnetic field had 180° jumps at the azimuthal angles of 20°, 110°, 140°, 220°, 280°, and 330°. These reversals seem to be related to the spiral arms since the locations of the jumps are coincident with those of the spiral arms. These six reversals of the magnetic field were seen only in the inner region of NGC6946 whereas four reversals can be identified in the outer region.

    DOI: 10.3390/galaxies7020059

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  • Y. Sofue, H. Nakanishi, K. Ichiki .  Magnetic field and ISM in the local Galactic disc .  Monthly Notices of the Royal Astronomical Society485 ( 1 ) 924 - 933   2019.5Reviewed

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    A correlation analysis is obtained among Faraday rotation measure, H i column density, and thermal and synchrotron radio brightness using archival all-sky maps of the Galaxy. A method is presented to calculate the magnetic strength and its line-of-sight (LOS) component, volume gas densities, effective LOS depth, and effective scale height of the disc from these data in a hybrid way. Applying the method to archival data, all-sky maps of the local magnetic field strength and its parallel component are obtained, which reveal details of local field orientation.

    DOI: 10.1093/mnras/stz407

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  • M. Machida, T. Akahori, K. E. Nakamura, H. Nakanishi, M. Haverkorn .  Radio broad-band visualization of global three-dimensional magnetohydrodynamical simulations of spiral galaxies - II. Faraday depolarization from 100 MHz to 10 GHz .  Monthly Notices of the Royal Astronomical Society482 ( 3 ) 3394 - 3402   2019.1Reviewed

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    Observational study of galactic magnetic fields is limited by projected observables. Comparison with numerical simulations is helpful to understand the real structures, and observational visualization of numerical data is an important task.Machida et al. (2018) have reported Faraday depth maps obtained from numerical simulations. They showed that the relation between azimuthal angle and Faraday depth depends on the inclination angle. In this paper, we investigate 100MHz to 10 GHz radio synchrotron emission from spiral galaxies, using the data of global three-dimensional magnetohydrodynamic simulations. We model internal and external Faraday depolarization at small scales and assume a frequency-independent depolarization. It is found that the internal and external Faraday depolarization becomes comparable inside the disc and the dispersion of Faraday depth becomes about 4 radm-2 for face-on view and 40 radm-2 for edge-on view, respectively. The internal depolarization becomes ineffective in the halo. Because of the magnetic turbulence inside the disc, frequency-independent depolarization works well and the polarization degree becomes 0.3 at high frequency. When the observed frequency is in the 100 MHz band, polarized intensity vanishes in the disc, while that from the halo can be observed. Because the remaining component of polarized intensity is weak in the halo and the polarization degree is about a few per cent, it may be difficult to observe that component. These results indicate that the structures of global magnetic fields in spiral galaxies could be elucidated, if broad-band polarimetry such as that with the Square Kilometre Array is achieved.

    DOI: 10.1093/mnras/sty2940

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  • Mami Machida, Takuya Akahori, Kenji E. Nakamura, Hiroyuki Nakanishi, Marijke Haverkorn .  Faraday depolarization effects in spiral galaxies .  Galaxies7 ( 1 )   2019.1Reviewed

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    Magnetic fields in the universe play an essential role in observations of the radio synchrotron continuum; however, we do not know enough about them, either observationally or theoretically. We are interested in galactic magnetic fields because they affect the structural formation of galaxies in terms of star-forming regions, spiral arms, and threads at the galactic center. To clarify the importance of magnetic fields, we carried out numerical simulations of the galactic gaseous disk with magnetic fields. We also calculated observables, such as the rotation measure and Stokes parameters, from the results of numerical simulation. FD maps and intensity maps have been reported, and the relation between azimuthal angle and FD has been shown to depend on the inclination of the observer. Furthermore, it has been shown that a polarized intensity below 800 MHz reflects field structure in the halo region, although the intensity is weak. The present paper summarizes the effects of Faraday depolarization and the relation between magnetic-field structure and Stokes parameters.

    DOI: 10.3390/galaxies7010015

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  • Nagito Koide, Hiroyuki Nakanishi, Nobuyuki Sakai, Asao Habe, Kazuhiro Shima, Tomoharu Kurayama, Mitsuhiro Matsuo, Daisuke Tezuka, Kohei Kurahara, Saeko Ueno, Ross A. Burns, Akiharu Nakagawa, Mareki Honma, Katsunori M. Shibata, Takumi Nagayama, Noriyuki Kawaguchi .  Outer rotation curve of the Galaxy with VERA. IV. Astrometry of IRAS 01123+6430 and the possibility of cloud–cloud collision .  Publications of the Astronomical Society of Japan71 ( 6 )   2019Reviewed

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    As part our investigation into the Galactic rotation curve, we carried out Very Long Baseline Interferometry (VLBI) observations towards the star-forming region IRAS 01123+6430 using VLBI Exploration of Radio Astrometry (VERA) to measure its annual parallax and proper motion. The annual parallax was measured to be 0.151 ± 0.042 mas, which corresponds to a distance of D = 6.61+–215544 kpc, and the obtained proper motion components were (μαcosδ, μδ) = (–1.44 ± 0.15, –0.27 ± 0.16) mas yr–1 in equatorial coordinates. Assuming Galactic constants of (R00) = (8.05 ± 0.45 kpc, 238 ± 14 km s–1), the Galactocentric distance and rotation velocity were measured to be (R, ) = (13.04 ± 2.24 kpc, 239 ± 22 km s–1), which are consistent with a flat Galactic rotation curve. The newly estimated distance provides a more accurate bolometric luminosity of the central young stellar object, LBol = (3.11 ± 2.86) × 103 L, which corresponds to a spectral type of B1–B2. Analysis of 12CO (J = 1–0) survey data obtained with the Five College Radio Astronomical Observatory (FCRAO) 14 m telescope shows that the molecular cloud associated with IRAS 01123+6430 consists of arc-like and linear components, which matches well a structure predicted by numerical simulation of the cloud–cloud collision phenomenon. The coexistence of arc-like and linear components implies that the relative velocity of the two initial clouds was as slow as 3–5 km s–1, which meets the expected criteria of massive star formation where the core mass is effectively increased in the presence of low relative velocity (∼3–5 km s–1), as suggested by Takahira, Tasker, and Habe (2014, ApJ, 792, 63).

    DOI: 10.1093/pasj/psz101

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  • Haruka Sakemi, Mami Machida, Takumi Ohmura, Shinsuke Ideguchi, Yoshimitsu Miyashita, Keitaro Takahashi, Takuya Akahori, Hiroki Akamatsu, Hiroyuki Nakanishi, Kohei Kurahara, Jamie Farnes .  Faraday tomography of the SS433 jet termination region .  Galaxies6 ( 4 ) 137   2018.12Reviewed

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    A jet termination region provides us with useful information about how a jet interacts with the interstellar medium. Identifying the strength and orientation of magnetic fields at the terminal is crucially important to understanding the mechanism of cosmic-ray acceleration. In this article, we report results of our Faraday-tomography analysis of the eastern region of the radio nebula W50, where a jet from the microquasar SS433 seems to terminate. We apply QU-fitting, a method of Faraday-tomography, to data from the Australia Telescope Compact Array (ATCA) at 1.3-3.0 GHz. In the analysis, we distinguish multiple polarized sources along the line of sight. We identify Galactic emission candidates at Faraday depths around 0 rad m-2 and 300 rad m-2. The Galactic emission around 0 rad m-2 is possibly located in front of W50. We also find emission from W50 with Faraday depths between ϕ = -112 to 228 rad m-2.

    DOI: 10.3390/galaxies6040137

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  • M. Machida, T. Akahori, K. E. Nakamura, H. Nakanishi, M. Haverkorn .  Radio broadband visualization of global three-dimensional magnetohydrodynamical simulations of spiral galaxies - I. Faraday rotation at 8GHz .  Monthly Notices of the Royal Astronomical Society480 ( 1 ) 17 - 25   2018.10Reviewed

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    Observational study of galactic magnetic fields is hampered by the fact that the observables only probe various projections of the magnetic fields. Comparison with numerical simulations is helpful to understand the real structures, and observational visualization of numerical data is an important task. In this paper, we investigate 8 GHz radio synchrotron emission from spiral galaxies, using the data of global three-dimensional magnetohydrodynamic simulations. We assume a frequency independent depolarization in our observational visualization. We find that the appearance of the global magnetic field depends on the viewing angle: a face-on view seemingly has hybrid magnetic field types combining axisymmetric modes with higher order modes; at a viewing angle of ~70°, the galaxy seems to contain a ring-like magnetic field structure; while in edge-on view, only field structure parallel to the disc can be seen. The magnetic vector seen at 8 GHz traces the global magnetic field inside the disc. These results indicate that the topology of global magnetic field obtained from the relation between azimuthal angle and Faraday depth strongly depends on the viewing angle of the galaxy. As one of the examples, we compare our results at a viewing angle of 25° with the results of IC342. The relation between azimuthal angle and Faraday depth of the numerical result shows a tendency similar to IC342, such as the peak values of the Faraday depth.

    DOI: 10.1093/mnras/sty1799

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  • Hirota Akihiko, Egusa Fumi, Baba Junichi, Kuno Nario, Muraoka Kazuyuki, Tosaki Tomoka, Miura Rie, Nakanishi Hiroyuki, Kawabe Ryohei .  ALMA 12CO (J = 1-0) imaging of the nearby galaxy M 83: Variations in the efficiency of star formation in giant molecular clouds .  Publications of the Astronomical Society of Japan70 ( 4 ) 73   2018.8ALMA 12CO (J = 1-0) imaging of the nearby galaxy M 83: Variations in the efficiency of star formation in giant molecular cloudsReviewed

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  • Archana Soam, Kate Pattle, Derek Ward-Thompson, Chang Won Lee, Sarah Sadavoy, Patrick M. Koch, Gwanjeong Kim, Jungmi Kwon, Woojin Kwon, Doris Arzoumanian, David Berry, Thiem Hoang, Motohide Tamura, Sang Sung Lee, Tie Liu, Kee Tae Kim, Doug Johnstone, Fumitaka Nakamura, A. Ran Lyo, Takashi Onaka, Jongsoo Kim, Ray S. Furuya, Tetsuo Hasegawa, Shih Ping Lai, Pierre Bastien, Eun Jung Chung, Shinyoung Kim, Harriet Parsons, Mark G. Rawlings, Steve Mairs, Sarah F. Graves, Jean Franois Robitaille, Hong Li Liu, Anthony P. Whitworth, Chakali Eswaraiah, Ramprasad Rao, Hyunju Yoo, Martin Houde, Ji Hyun Kang, Yasuo Doi, Minho Choi, Miju Kang, Simon Coudé, Hua Bai Li, Masafumi Matsumura, Brenda C. Matthews, Andy Pon, James Di Francesco, Saeko S. Hayashi, Koji S. Kawabata, Shu Ichiro Inutsuka, Keping Qiu, Erica Franzmann, Per Friberg, Jane S. Greaves, Jason M. Kirk, Di Li, Hiroko Shinnaga, Sven Van Loo, Yusuke Aso, Do Young Byun, Huei Ru Chen, Mike C.Y. Chen, Wen Ping Chen, Tao Chung Ching, Jungyeon Cho, Antonio Chrysostomou, Emily Drabek-Maunder, Stewart P.S. Eyres, Jason Fiege, Rachel K. Friesen, Gary Fuller, Tim Gledhill, Matt J. Griffin, Qilao Gu, Jennifer Hatchell, Wayne Holland, Tsuyoshi Inoue, Kazunari Iwasaki, Il Gyo Jeong, Sung Ju Kang, Francisca Kemper, Kyoung Hee Kim, Mi Ryang Kim, Kevin M. Lacaille, Jeong Eun Lee, Dalei Li, Junhao Liu, Sheng Yuan Liu, Gerald H. Moriarty-Schieven, Hiroyuki Nakanishi, Nagayoshi Ohashi, Nicolas Peretto, Tae Soo Pyo, Lei Qian, Brendan Retter, John Richer, Andrew Rigby, Giorgio Savini, Anna M.M. Scaife .  Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements .  Astrophysical Journal861 ( 1 ) 65   2018.7Reviewed

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    We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on the James Clerk Maxwell Telescope in Hawaii. This work is part of the B-fields in Star-forming Region Observations survey initiated to understand the role of magnetic fields in star formation for nearby star-forming molecular clouds. We present a first look at the geometry and strength of magnetic fields in Oph-B. The field geometry is traced over ∼0.2 pc, with clear detection of both of the sub-clumps of Oph-B. The field pattern appears significantly disordered in sub-clump Oph-B1. The field geometry in Oph-B2 is more ordered, with a tendency to be along the major axis of the clump, parallel to the filamentary structure within which it lies. The degree of polarization decreases systematically toward the dense core material in the two sub-clumps. The field lines in the lower density material along the periphery are smoothly joined to the large-scale magnetic fields probed by NIR polarization observations. We estimated a magnetic field strength of 630 ± 410 μG in the Oph-B2 sub-clump using a Davis-Chandrasekhar-Fermi analysis. With this magnetic field strength, we find a mass-to-flux ratio λ = 1.6 ± 1.1, which suggests that the Oph-B2 clump is slightly magnetically supercritical.

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  • Takuya Akahori, Yuichi Kato, Kazuhiro Nakazawa, Takeaki Ozawa, Liyi Gu, Motokazu Takizawa, Yutaka Fujita, Hiroyuki Nakanishi, Nobuhiro Okabe, Kazuo Makishima .  ATCA 16 cm observation of CIZA J1358.9-4750: Implication of merger stage and constraint on non-thermal properties .  Publications of the Astronomical Society of Japan70 ( 3 )   2018.6Reviewed

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    We report the Australia Telescope Compact Array 16 cm observation of CIZA J1358.9-4750. Recent X-ray studies imply that this galaxy cluster is composed of merging, binary clusters. Using the EW367 configuration, we found no significant diffuse radio emission in and around the cluster. An upper limit of the total radio power at 1.4 GHz is ∼1.1 × 1022 W Hz-1 in 30 square arcminutes, which is a typical size for radio relics. It is known that an empirical relation holds between the total radio power and X-ray luminosity of the host cluster. The upper limit is about one order of magnitude lower than the power expected from the relation. Very young (∼70 Myr) shocks with low Mach numbers (∼1.3), which are often seen at an early stage of merger simulations, are suggested by the previous X-ray observation. The shocks may generate cosmic-ray electrons with a steep energy spectrum, which is consistent with non-detection of bright (>1023 W Hz-1) relic in this 16 cm band observation. Based on the assumption of energy equipartition, the upper limit gives a magnetic field strength of below 0.68f(Dlos/1 Mpc)-1(γmin/200)-1 μG, where f is the cosmic-ray total energy density over the cosmic-ray electron energy density, Dlos is the depth of the shock wave along the sightline, and min is the lower cutoff Lorentz factor of the cosmic-ray electron energy spectrum.

    DOI: 10.1093/pasj/psy042

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  • Jungmi Kwon, Yasuo Doi, Motohide Tamura, Masafumi Matsumura, Kate Pattle, David Berry, Sarah Sadavoy, Brenda C. Matthews, Derek Ward-Thompson, Tetsuo Hasegawa, Ray S. Furuya, Andy Pon, James Di Francesco, Doris Arzoumanian, Saeko S. Hayashi, Koji S. Kawabata, Takashi Onaka, Minho Choi, Miju Kang, Thiem Hoang, Chang Won Lee, Sang Sung Lee, Hong Li Liu, Tie Liu, Shu Ichiro Inutsuka, Chakali Eswaraiah, Pierre Bastien, Woojin Kwon, Shih Ping Lai, Keping Qiu, Simon Coudé, Erica Franzmann, Per Friberg, Sarah F. Graves, Jane S. Greaves, Martin Houde, Doug Johnstone, Jason M. Kirk, Patrick M. Koch, Di Li, Harriet Parsons, Ramprasad Rao, Mark G. Rawlings, Hiroko Shinnaga, Sven Van Loo, Yusuke Aso, Do Young Byun, Huei Ru Chen, Mike C.Y. Chen, Wen Ping Chen, Tao Chung Ching, Jungyeon Cho, Antonio Chrysostomou, Eun Jung Chung, Emily Drabek-Maunder, Stewart P.S. Eyres, Jason Fiege, Rachel K. Friesen, Gary Fuller, Tim Gledhill, Matt J. Griffin, Qilao Gu, Jennifer Hatchell, Wayne Holland, Tsuyoshi Inoue, Kazunari Iwasaki, Il Gyo Jeong, Ji Hyun Kang, Sung Ju Kang, Francisca Kemper, Gwanjeong Kim, Jongsoo Kim, Kee Tae Kim, Kyoung Hee Kim, Mi Ryang Kim, Shinyoung Kim, Kevin M. Lacaille, Jeong Eun Lee, Dalei Li, Hua Bai Li, Junhao Liu, Sheng Yuan Liu, A. Ran Lyo, Steve Mairs, Gerald H. Moriarty-Schieven, Fumitaka Nakamura, Hiroyuki Nakanishi, Nagayoshi Ohashi, Nicolas Peretto, Tae Soo Pyo, Lei Qian, Brendan Retter, John Richer, Andrew Rigby, Jean Franois Robitaille, Giorgio Savini, Anna M.M. Scaife, Archana Soam, Ya Wen Tang, Kohji Tomisaka .  A First Look at BISTRO Observations of the ρ Oph-A core .  Astrophysical Journal859 ( 1 )   2018.5Reviewed

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    We present 850 μm imaging polarimetry data of the ρ Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part of our ongoing survey project, -fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify the orientation of the magnetic field projected on the plane of the sky at a resolution of 0.01 pc. We identify 10 subregions with distinct polarization fractions and angles in the 0.2 pc ρ Oph-A core; some of them can be part of a coherent magnetic field structure in the ρ Oph region. The results are consistent with previous observations of the brightest regions of ρ Oph-A, where the degrees of polarization are at a level of a few percent, but our data reveal for the first time the magnetic field structures in the fainter regions surrounding the core where the degree of polarization is much higher (>5%). A comparison with previous near-infrared polarimetric data shows that there are several magnetic field components that are consistent at near-infrared and submillimeter wavelengths. Using the Davis-Chandrasekhar-Fermi method, we also derive magnetic field strengths in several subcore regions, which range from approximately 0.2 to 5 mG. We also find a correlation between the magnetic field orientations projected on the sky and the core centroid velocity components.

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  • Haruka Sakemi, Mami Machida, Takuya Akahori, Hiroyuki Nakanishi, Hiroki Akamatsu, Kohei Kurahara, Jamie Farnes .  Magnetic field analysis of the bow and terminal shock of the SS 433 jet .  Publications of the Astronomical Society of Japan70 ( 2 ) 27   2018.3Reviewed

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    We report a polarization analysis of the eastern region of W 50, observed with the Australia Telescope Compact Array (ATCA) at 1.4-3.0 GHz. In order to study the physical structures in the region where the SS 433 jet and W 50 interact, we obtain an intrinsic magnetic field vector map of that region. We find that the orientation of the intrinsic magnetic field vectors are aligned along the total intensity structures, and that there are characteristic, separate structures related to the jet, the bow shock, and the terminal shock. The Faraday rotation measures (RMs), and the results of Faraday tomography suggest that a high-intensity, filamentary structure in the north-south direction of the eastern-edge region can be separated into at least two parts to the north and south. The results of Faraday tomography also show that there are multiple components along the line of sight and/or within the beam area. In addition, we analyze the X-ray ring-like structure observed with XMM-Newton. While the possibility still remains that this X-ray ring is “real”, it seems that the structure is not ring-like at radio wavelengths. Finally, we suggest that the structure is a part of the helical structure that coils the eastern ear of W 50.

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  • Takuya Akahori, Hiroyuki Nakanishi, Yoshiaki Sofue, Yutaka Fujita, Kiyotomo Ichiki, Shinsuke Ideguchi, Osamu Kameya, Takahiro Kudoh, Yuki Kudoh, Mami Machida, Yoshimitsu Miyashita, Hiroshi Ohno, Takeaki Ozawa, Keitaro Takahashi, Motokazu Takizawa, Dai G. Yamazaki .  Cosmic magnetism in centimeter- and meter-wavelength radio astronomy .  Publications of the Astronomical Society of Japan70 ( 1 )   2018.1Invited Reviewed

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    The magnetic field is ubiquitous in the universe. Though it plays an essential role in various astrophysical phenomena, its real origin and evolution are poorly known. This article reviews the understanding of the latest research concerning magnetic fields in the interstellarmedium, the Milky Way Galaxy, external galaxies, active galactic nuclei, clusters of galaxies, and the cosmic web. Particularly, the review is concentrated in the achievements that have been provided by centimeter- and meter-wavelength radio observations. The article also introduces various methods for analyzing linear polarization data, including synchrotron radiation, Faraday rotation, depolarization, and Faraday tomography.

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  • Umemoto Tomofumi et al. .  FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN). I. Project overview and initial results .  Publications of the Astronomical Society of Japan69 ( 5 ) 78   2017.10Reviewed

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    DOI: 10.1093/pasj/psx061

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  • Takuya Hatakeyama, Nario Kuno, Kazuo Sorai, Hiroyuki Kaneko, Yusuke Miyamoto, Kazuyuki Muraoka, Miho Takeda, Kazuki Yanagitani, Nozomi Kishida, Michiko Umei, Takahiro Tanaka, Yuto Tomiyasu, Hiroyuki Nakanishi, Chey Saita, Saeko Ueno, Dragan Salak, Naoko Matsumoto, Kana Morokuma-Matsui, Hsi-An Pan, Naomasa Nakai .  CO Multi-line Imaging of Nearby Galaxies (COMING). II. Transitions between atomic and molecular gas, diffuse and dense gas, gas and stars in the dwarf galaxy NGC2976 .  PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN69 ( 4 ) 67   2017.8Reviewed

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    In this study, we present the results of (CO)-C-12(J = 1-0), (CO)-C-13(J = 1-0), and (CO)-O-18(J = 1-0) simultaneous observations of the dwarf galaxy NGC2976 conducted as a part of the CO Multi-line Imaging of Nearby Galaxies (COMING) project using the Nobeyama 45 m telescope. We investigated the properties of the molecular gas and star formation in NGC2976. We found that the molecular gas fraction depends on the surface densities of the total gas and the star formation rate, according to the main stellar disks of spiral galaxies. The ratio of (CO)-C-12(J = 3-2) to (CO)-C-12(J = 1-0) implies that the temperature of the molecular gas increases with decreases in the surface density of molecular gas. We detected (CO)-C-13(J = 1-0) by using the stacking method. The ratio between the integrated intensities of (CO)-C-12(J = 1-0) and (CO)-C-13(J = 1-0) was 27 +/- 11. These ratios imply that the diffuse gas phase is dominant in low surface density regimes. We obtained a lower limit of the ratio between the integrated intensities of (CO)-C-12(J = 1-0) and (CO)-O-18(J = 1-0) of 21. The relation between the surface densities of the total gas and the star formation rate followed a power-law index of 2.08 +/- 0.11, which was larger than that between the surface densities of the molecular gas and the star formation rate (1.62 +/- 0.17). The steep slope in the relation between the surface densities of the total gas and the star formation rate can be attributed to the rapid increase in the fraction of molecular gas at the surface density of similar to 10M(circle dot). The kinematics of the molecular gas suggest that the bar-like feature rotates with a rigid-body rotation curve rather than a certain pattern speed.

    DOI: 10.1093/pasj/psx044

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  • Derek Ward-Thompson, Kate Pattle, Pierre Bastien, Ray S. Furuya, Woojin Kwon, Shih Ping Lai, Keping Qiu, David Berry, Minho Choi, Simon Coudé, James Di Francesco, Thiem Hoang, Erica Franzmann, Per Friberg, Sarah F. Graves, Jane S. Greaves, Martin Houde, Doug Johnstone, Jason M. Kirk, Patrick M. Koch, Jungmi Kwon, Chang Won Lee, Di Li, Brenda C. Matthews, Joseph C. Mottram, Harriet Parsons, Andy Pon, Ramprasad Rao, Mark Rawlings, Hiroko Shinnaga, Sarah Sadavoy, Sven Van Loo, Yusuke Aso, Do Young Byun, Chakali Eswaraiah, Huei Ru Chen, Mike C.Y. Chen, Wen Ping Chen, Tao Chung Ching, Jungyeon Cho, Antonio Chrysostomou, Eun Jung Chung, Yasuo Doi, Emily Drabek-Maunder, Stewart P.S. Eyres, Jason Fiege, Rachel K. Friesen, Gary Fuller, Tim Gledhill, Matt J. Griffin, Qilao Gu, Tetsuo Hasegawa, Jennifer Hatchell, Saeko S. Hayashi, Wayne Holland, Tsuyoshi Inoue, Shu Ichiro Inutsuka, Kazunari Iwasaki, Il Gyo Jeong, Ji Hyun Kang, Miju Kang, Sung Ju Kang, Koji S. Kawabata, Francisca Kemper, Gwanjeong Kim, Jongsoo Kim, Kee Tae Kim, Kyoung Hee Kim, Mi Ryang Kim, Shinyoung Kim, Kevin M. Lacaille, Jeong Eun Lee, Sang Sung Lee, Dalei Li, Hua Bai Li, Hong Li Liu, Junhao Liu, Sheng Yuan Liu, Tie Liu, A. Ran Lyo, Steve Mairs, Masafumi Matsumura, Gerald H. Moriarty-Schieven, Fumitaka Nakamura, Hiroyuki Nakanishi, Nagayoshi Ohashi, Takashi Onaka, Nicolas Peretto, Tae Soo Pyo, Lei Qian, Brendan Retter, John Richer, Andrew Rigby, Jean Francois Robitaille, Giorgio Savini, Anna M.M. Scaife, Archana Soam, Motohide Tamura, Ya Wen Tang, Kohji Tomisaka .  First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould Belt .  Astrophysical Journal842 ( 1 )   2017.6Reviewed

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    We present the first results from the B-fields In STar-forming Region Observations (BISTRO) survey, using the Sub-millimetre Common-User Bolometer Array 2 camera, with its associated polarimeter (POL-2), on the James Clerk Maxwell Telescope in Hawaii. We discuss the survey's aims and objectives. We describe the rationale behind the survey, and the questions that the survey will aim to answer. The most important of these is the role of magnetic fields in the star formation process on the scale of individual filaments and cores in dense regions. We describe the data acquisition and reduction processes for POL-2, demonstrating both repeatability and consistency with previous data. We present a first-look analysis of the first results from the BISTRO survey in the OMC 1 region. We see that the magnetic field lies approximately perpendicular to the famous "integral filament" in the densest regions of that filament. Furthermore, we see an "hourglass" magnetic field morphology extending beyond the densest region of the integral filament into the less-dense surrounding material, and discuss possible causes for this. We also discuss the more complex morphology seen along the Orion Bar region. We examine the morphology of the field along the lower-density northeastern filament. We find consistency with previous theoretical models that predict magnetic fields lying parallel to low-density, non-self-gravitating filaments, and perpendicular to higher-density, self-gravitating filaments.

    DOI: 10.3847/1538-4357/aa70a0

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  • Derek Ward-Thompson et al. .  First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould Belt .  The Astrophysical Journal842 ( 1 ) 66   2017.6First Results from BISTRO: A SCUBA-2 Polarimeter Survey of the Gould BeltReviewed

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  • Mitsuhiro Matsuo, Hiroyuki Nakanishi, Tetsuhiro Minamidani, Kazufumi Torii, Masao Saito, Nario Kuno, Tsuyoshi Sawada, Tomoka Tosaki, Naoto Kobayashi, Chikako Yasui, Hiroyuki Mito, Takashi Hasegawa, Akihiko Hirota .  Discovery of a distant molecular cloud in the extreme outer Galaxy with the Nobeyama 45 m telescope .  Publications of the Astronomical Society of Japan69 ( 3 ) L3   2017.6Reviewed

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    DOI: 10.1093/pasj/psx019

    Scopus

  • Sofue, Yoshiaki; Nakanishi, Hiroyuki .  Star formation law in the Milky Way .  Publications of the Astronomical Society of Japan69   19   2017.4Star formation law in the Milky WayReviewed

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  • Yoshiaki Sofue, Hiroyuki Nakanishi .  Star formation law in the Milky Way .  PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN69 ( 2 )   2017.4Reviewed

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    The Schmidt law (SF law) in the Milky Way was investigated using 3D distribution maps of H II regions and HI and molecular (H-2) gases with spatial resolutions of similar to 1 kpc in the Galactic plane and a few tens of pc in the vertical direction. H II regions were shown to be distributed in a star-forming (SF) disk with nearly constant vertical full thickness 92 pc in spatial coincidence with the molecular gas disk. The vertically averaged volume star formation rate (SFR) rho(SFR) in the SF disk is related to the surface SFR Sigma(SFR) by rho(SFR)/[M-circle dot yr(-1) kpc(-3)] = 9.26 x Sigma(SFR)/[M-circle dot yr(-1) kpc(-2)]. The SF law fitted by a single power law of gas density in the form of Sigma(SFR) alpha rho SFR alpha rho(alpha)(gas) and alpha Sigma(beta)(gas) showed indices of alpha = 0.78 +/- 0.05 for rho H-2 and 2.15 +/- 0.08 for rho(total), and beta = 1.14 +/- 0.23 for Sigma(total), where rho and Sigma denote volume and surface densities, respectively. The star formation rate is shown to be directly related to the molecular gas, but indirectly to HI and total gas densities. The dependence of the SF law on the gaseous phase is explained by the phase transition theory between HI and H-2.

    DOI: 10.1093/pasj/psw123

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  • G. Orosz, H. Imai, R. Dodson, M. J. Rioja, S. Frey, R. A. Burns, S. Etoka, A. Nakagawa, H. Nakanishi, Y. Asaki, S. R. Goldman, D. Tafoya .  Astrometry of OH/IR Stars Using 1612 MHz Hydroxyl Masers. I. Annual Parallaxes of WX Psc and OH138.0+7.2 .  Astronomical Journal153 ( 3 ) 119 - 131   2017.3Reviewed

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    We report on the measurement of the trigonometric parallaxes of 1612 MHz hydroxyl masers around two asymptotic giant branch stars, WX Psc and OH 138.0+7.2, using the NRAO Very Long Baseline Array with in-beam phase referencing calibration. We obtain a 3σ upper limit of ≤5.3 mas on the parallax of WX Psc, corresponding to a lower limit distance estimate of ≳190 pc. The obtained parallax of OH 138.0+7.2 is 0.52 ±0.09 mas (±18%), corresponding to a distance of 1.9-0.3+0.4, making this the first hydroxyl maser parallax below one milliarcsecond. We also introduce a new method of error analysis for detecting systematic errors in the astrometry. Finally, we compare our trigonometric distances to published phase-lag distances toward these stars and find a good agreement between the two methods.

    DOI: 10.3847/1538-3881/153/3/119

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  • Yoshiaki Sofue, Hiroyuki Nakanishi .  Three-dimensional Aquila Rift: magnetized HI arch anchored by molecular complex .  MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY464 ( 1 ) 783 - 793   2017.1Reviewed

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    Three-dimensional structure of the Aquila Rift of magnetized neutral gas is investigated by analysing H I and CO line data. The projected distance on the Galactic plane of the H I arch of the Aquila Rift is r(perpendicular to) similar to 250 pc from the Sun. The H I arch emerges at l similar to 30 degrees, reaches to altitudes as high as similar to 500 pc above the plane at l similar to 350 degrees, and returns to the disc at l similar to 270 degrees. The extent of arch at positive latitudes is similar to 1 kpc and the width is similar to 100 pc. The eastern root is associated with the giant molecular cloud complex, which is the main body of the optically defined Aquila Rift. The H I and molecular masses of the Rift are estimated to be M-HI similar to 1.4 x 10(5)M circle dot and M-H2 similar to 3 x 10(5)M circle dot. Gravitational energies to lift the gases to their heights are E-grav:H I similar to 1.4 x 10(51) erg and E-grav:H2 similar to 0.3 x 10(51) erg, respectively. Magnetic field is aligned along the HI arch of the Rift, and the strength is measured to be B similar to 10 mu Gusing Faraday rotation measures of extragalactic radio sources. The magnetic energy is estimated to be E-mag similar to 1.2 x 10(51) erg. A possible mechanism of formation of the Aquila Rift is proposed in terms of interstellar magnetic inflation by a sinusoidal Parker instability of wavelength of similar to 2.5 kpc and amplitude similar to 500 pc.

    DOI: 10.1093/mnras/stw2310

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  • Kazuyuki Muraoka, Kazuo Sorai, Nario Kuno, Naomasa Nakai, Hiroyuki Nakanishi, Miho Takeda, Kazuki Yanagitani, Hiroyuki Kaneko, Yusuke Miyamoto, Nozomi Kishida, Takuya Hatakeyama, Michiko Umei, Takahiro Tanaka, Yuto Tomiyasu, Chey Saita, Saeko Ueno, Naoko Matsumoto, Dragan Salak, Kana Morokuma-Matsui .  CO Multi-line Imaging of Nearby Galaxies (COMING). I. Physical properties of molecular gas in the barred spiral galaxy NGC 2903 .  Publications of the Astronomical Society of Japan68 ( 5 ) 89   2016.10CO Multi-line Imaging of Nearby Galaxies (COMING). I. Physical properties of molecular gas in the barred spiral galaxy NGC 2903Reviewed

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    We present simultaneous mappings of J = 1-0 emission of 12CO, 13CO, and C18O molecules toward the whole disk (8' × 5' or 20.8 kpc × 13.0 kpc) of the nearby barred spiral galaxy NGC 2903 with the Nobeyama Radio Observatory 45 m telescope at an effective angular resolution of 20″ (or 870 pc). We detected 12CO(J = 1-0) emission over the disk of NGC 2903. In addition, significant 13CO(J = 1-0) emission was found at the center and bar-ends, whereas we could not detect any significant C18O(J = 1-0) emission. In order to improve the signal-to-noise ratio of CO emission and to obtain accurate line ratios of 12CO(J = 2-1)/12CO(J = 1-0) (R2-1/1-0) and 13CO(J = 1-0)/12CO(J = 1-0) (R13/12), we performed the stacking analysis for our 12CO(J = 1-0), 13CO(J = 1-0), and archival 12CO(J = 2-1) spectra with velocity axis alignment in nine representative regions of NGC 2903. We successfully obtained the stacked spectra of the three CO lines, and could measure averaged R2-1/1-0 and R13/12 with high significance for all the regions. We found that both R2-1/1-0 and R13/12 differ according to the regions, which reflects the difference in the physical properties of molecular gas, i.e., density (n_H_2) and kinetic temperature (TK). We determined n_H_2 and TK using R2-1/1-0 and R13/12 based on the large velocity gradient approximation. The derived n_H_2 ranges from ˜1000 cm-3 (in the bar, bar-ends, and spiral arms) to 3700 cm-3 (at the center) and the derived TK ranges from 10 K (in the bar and spiral arms) to 30 K (at the center). We examined the dependence of star formation efficiencies (SFEs) on n_H_2 and TK, and found a positive correlation between SFE and n_H_2 with correlation coefficient for the least-squares power-law fit R2 of 0.50. This suggests that molecular gas density governs the spatial variations in SFEs.

    DOI: 10.1093/pasj/psw080

    arXiv

  • HI4PI Collaboration, N. Ben Bekhti, L, Flöer, R. Keller, J. Kerp, D. Lenz, B. Winkel, J. Bailin, M. R. Calabretta, L. Dedes, H. A. Ford, B. K. Gibson, U. Haud, S. Janowiecki, P. M. W. Kalberla, F. J. Lockman, N. M. McClure-Griffiths, T. Murphy, H. Nakanishi, D. J. Pisano, L. Staveley-Smith .  HI4PI: A full-sky H I survey based on EBHIS and GASS .  Astronomy & Astrophysics594   116   2016.10HI4PI: A full-sky H I survey based on EBHIS and GASSReviewed

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    DOI: 10.1051/0004-6361/201629178

    arXiv

  • Yoshiaki Sofue, Hiroyuki Nakanishi .  Three-dimensional distribution of the ISM in the Milky Way Galaxy. IV. 3D molecular fraction and Galactic-scale H I-to-H2 transition .  Publications of the Astronomical Society of Japan68 ( 4 ) 63   2016.8Three-dimensional distribution of the ISM in the Milky Way Galaxy. IV. 3D molecular fraction and Galactic-scale H I-to-H2 transitionReviewed

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    Three-dimensional (3D) distribution of the volume-density molecular fraction, defined by f_mol^ρ =ρ _H_2/(ρ _{H I}+ρ _H_2), is studied in the Milky Way Galaxy. The molecular front appears at galacto-centric distance of R ˜ 8 kpc, where the galactic-scale phase transition from atomic to molecular hydrogen occurs with f_mol^ρ dropping from ˜0.8 to 0.2 within a radial interval as narrow as ˜0.5 kpc. The f_mol^ρ front is much sharper than that of the surface density molecular fraction. The f_mol^ρ front also appears in the direction vertical to the galactic plane with a full width of the high-f_mol^ρ disk to be ˜100 pc. The radial and vertical f_mol^ρ profiles, particularly the front behavior, are fitted by theoretical curves calculated using the observed density profile and assumed radiation field and metallicity with exponential gradients. The molecular fraction was found to be enhanced along spiral arms at radii R ˜ 6 to 10 kpc, such as the Perseus arm. This implies that the molecular clouds are produced from H I in the arms and are dissociated in the interarm regions in the transition region around the molecular front. We also show that there is a threshold value of mean H I density, over which H I is transformed into molecular gas.

    DOI: 10.1093/pasj/psw062

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  • T. Ozawa, H. Nakanishi, T. Akahori, K. Anraku, M. Takizawa, I. Takahashi, S. Onodera, Y. Tsuda, and Y. Sofue .  JVLA S- and X-band polarimetry of the merging cluster Abell 2256 .  Publications of the Astronomical Society of Japan   2015.9 JVLA S- and X-band polarimetry of the merging cluster Abell 2256Reviewed

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    DOI: 10.1093/pasj/psv082

  • Nobuyuki Sakai, Hiroyuki Nakanishi, Mitsuhiro Matsuo, Nagito Koide, Daisuke Tezuka, Tomoharu Kurayama, Katsunori M. Shibata, Yuji Ueno,& Mareki Honma .  Outer rotation curve of the Galaxy with VERA. III. Astrometry of IRAS 07427-2400 and test of the density-wave theory .  Publications of the Astronomical Society of Japan67 ( 4 ) 69   2015.8Outer rotation curve of the Galaxy with VERA. III. Astrometry of IRAS 07427-2400 and test of the density-wave theoryReviewed

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  • Ross A. Burns, Takumi Nagayama, Toshihiro Handa, Toshihiro Omodaka, Akiharu Nakagawa, Hiroyuki Nakanishi, Masahiko Hayashi,& Makoto Shizugami .  Trigonometric Distance and Proper Motion of Iras 20056+3350: A Massive Star-forming Region on the solar Circle .  The Astrophysical Journal797 ( 1 ) 39   2014.12Trigonometric Distance and Proper Motion of Iras 20056+3350: A Massive Star-forming Region on the solar CircleReviewed

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  • James O. Chibueze, Hirofumi Sakanoue, Takumi Nagayama, Toshihiro Omodaka, Toshihiro Handa, Tatsuya Kamezaki, Ross A. Burns, Hideyuki Kobayashi, Hiroyuki Nakanishi, Mareki Honma, Yuji Ueno, Tomoharu Kurayama, Mitsuhiro Matsuo,& Nobuyuki Sakai, .  Trigonometric parallax of IRAS 22555+6213 with VERA: Three-dimensional view of sources along the same line of sight .  Publications of the Astronomical Society of Japan66 ( 6 ) 104   2014.12Trigonometric parallax of IRAS 22555+6213 with VERA: Three-dimensional view of sources along the same line of sightReviewed

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  • Ayako Tanaka, Hiroyuki Nakanishi, Nario Kuno, Akihiko Hirota .  Phase transition between atomic and molecular hydrogen in nearby spiral galaxies .  PASJ66   66   2014.6Phase transition between atomic and molecular hydrogen in nearby spiral galaxiesReviewed

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  • Akihiko Hirota, Nario Kuno, Junichi Baba, Fumi Egusa, Asao Habe, Kazuyuki Muraoka, Ayako Tanaka, Hiroyuki Nakanishi, Ryohei Kawabe .  Wide-field 12CO (J = 1-0) imaging of the nearby barred galaxy M 83 with NMA and Nobeyema 45 m telescope: Mole cular gas kinematics and star formation along the bar .  PASJ66   46   2014.4Wide-field 12CO (J = 1-0) imaging of the nearby barred galaxy M 83 with NMA and Nobeyema 45 m telescope: Mole cular gas kinematics and star formation along the barReviewed

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  • Yutaka Fujita, Hiroyuki Nakanishi, Erik Muller, Naoto Kobayashi, Masao Saito, Chikako Yasui, Hiroki Kikuchi,& Keigo Yoshinaga, .  The environment around the young massive star cluster RSGC 1 and HESS J1837-069 .  Publications of the Astronomical Society of Japan66 ( 1 ) 19   2014.2The environment around the young massive star cluster RSGC 1 and HESS J1837-069Reviewed

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  • Nobuyuki Sakai, Mareki Honma, Hiroyuki Nakanishi, Hirofumi Sakanoue,& Tomoharu Kurayama .  The outer rotation curve project with VERA: Trigonometric parallax of IRAS 05168+3634 .  Proceedings of the International Astronomical Union, IAU Symposium289   95 - 98   2013.2The outer rotation curve project with VERA: Trigonometric parallax of IRAS 05168+3634

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  • Mareki Honma, Takumi Nagayama, Kazuma Ando, Takeshi Bushimata, Yoon Kyung Choi, Toshihiro Handa, Tomoya Hirota, Hiroshi Imai, Takaaki Jike, Mi Kyoung Kim, Osamu Kameya, Noriyuki Kawaguchi, Hideyuki Kobayashi, Tomoharu Kurayama, Seisuke Kuji, Naoko Matsumoto, Seiji Manabe, Takeshi Miyaji, Kazuhito Motogi, Akiharu Nakagawa, Hiroyuki Nakanishi, Kotaro Niinuma, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Nobuyuki Sakai, Katsuhisa Sato, Mayumi Sato, Katsunori M. Shibata, Satoshi Shiozaki, Kazuyoshi Sunada, Yoshiaki Tamura, Yuji Ueno, Aya Yamauchi .  Fundamental Parameters of the Milky Way Galaxy Based on VLBI astrometry .  Publications of the Astronomical Society of Japan64 ( 6 ) 1 - 13   2012.12Fundamental Parameters of the Milky Way Galaxy Based on VLBI astrometryReviewed

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  • N. Sakai, M. Honma, H. Nakanishi, H. Sakanoue, T. Kurayama, K. M. Shibata, and M. Shizugami, .  Outer Rotation Curve of the Galaxy with VERA I: Trigonometric Parallax of IRAS 05168+3634 .  Publications of the Astronomical Society of Japan64   108 - 118   2012.10Outer Rotation Curve of the Galaxy with VERA I: Trigonometric Parallax of IRAS 05168+3634Reviewed

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  • Nobuyuki Sakai, Mareki Honma, Hiroyuki Nakanishi, Hirofumi Sakanoue, Tomoharu Kurayama,& VERA project member .  Measurement of a Rotation Velocity of the Outer Galaxy with VERA: Mass Distribution of the Galaxy .  ASP Conference Proceedings458   243   2012.8Measurement of a Rotation Velocity of the Outer Galaxy with VERA: Mass Distribution of the Galaxy

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  • Nobuyuki Sakai, Mareki Honma, Hiroyuki, Nakanishi, Hirofumi Sakanoue,& Tomoharu Kurayama .  Mass distribution of the Galaxy with VERA .  Cosmic Masers - from OH to H0, Proceedings of the International Astronomical Union, IAU Symposium287   421 - 422   2012.7Mass distribution of the Galaxy with VERAReviewed

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  • Hiroshi Imai, Nobuyuki Sakai, Hiroyuki Nakanishi, Hirofumi Sakanoue, Mareki Honma, Takeshi Miyaji .  Annual Parallax of the K-Type Star System IRAS 22480+6002 Measured with VERA .  Publications of the Astronomical Society of Japan64 ( 6 ) 1 - 11   2012.1Annual Parallax of the K-Type Star System IRAS 22480+6002 Measured with VERAReviewed

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  • Tomoka Tosaki, Nario Kuno, Sachiko Onodera, Rie Miura, Tsuyoshi Sawada, Kazuyuki Muraoka, Kouichiro Nakanishi, Shinya Komugi, Hiroyuki Nakanishi, Hiroyuki Kaneko, Akihiko Hirota, Kotaro Kohno, Ryohei Kawabe .  NRO M33 All-Disk Survey of Giant Molecular Clouds (NRO MAGiC). I. H I to H2 Transition .  Publications of the Astronomical Society of Japan63 ( 6 ) 1171 - 1179   2011.12NRO M33 All-Disk Survey of Giant Molecular Clouds (NRO MAGiC). I. H I to H2 TransitionReviewed

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  • Nario Kuno, Tomoka Tosaki, Sachiko Onodera, Rie Miura, Kazuyuki Muraoka, Shinya Komugi, Tsuyoshi Sawada, Koichiro Nakanishi, Kotaro Kohno, Hiroyuki Kaneko, Akihiko Hirota, Nobuo Arimoto, Hiroyuki Nakanishi,& Ryohei Kawabe .  NRO Legacy Project: M33 all Disk Survey of Giant Molecular Clouds with NRO 45-m and ASTE 10-m telescopes .  Proceedings of the International Astronomical Union, IAU Symposium277   67 - 70   2011.12NRO Legacy Project: M33 all Disk Survey of Giant Molecular Clouds with NRO 45-m and ASTE 10-m telescopes

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  • Tomoka Tosaki, Nario Kuno,Sachiko Onodera, Rie Miura, Kazuyuki Muraoka, Tsuyoshi Sawada, Shinya Komugi, Koichiro Nakanishi, Kotaro Kohno, Ryohei Kawabe, Hiroyuki Nakanishi, Nobuo Arimoto .  NRO legacy project: M 33 all disk survey of Giant Molecular Clouds (GMCs) with NRO-45m and ASTE-10m telescopes .  EAS Publications Series52   125 - 128   2011.11NRO legacy project: M 33 all disk survey of Giant Molecular Clouds (GMCs) with NRO-45m and ASTE-10m telescopes

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  • Akihiko Hirota, Nario Kuno, Naoko Sato, Hiroyuki Nakanishi, Tomoka Tosaki, Kazuo Sorai .  Giant Molecular Clouds in the Spiral Arm of IC 342 .  The Astrophysical Journal737 ( 1 ) 40 - 54   2011.8Giant Molecular Clouds in the Spiral Arm of IC 342Reviewed

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  • K. Ando, T. Nagayama, T. Omodaka, T. Handa, H. Imai, A. Nakagawa, H. Nakanishi, M. Honma, H. Kobayashi, T. Miyaji .  Astrometry of Galactic Star-Forming Region ON2N with VERA: Estimation of the Galactic Constants .  Publications of the Astronomical Society of Japan63 ( 1 ) 45 - 51   2011.2Astrometry of Galactic Star-Forming Region ON2N with VERA: Estimation of the Galactic ConstantsReviewed

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  • Hirota, Akihiko, Kuno, Nario, Sato, Naoko, Nakanishi, Hiroyuki, Tosaki, Tomoka, Sorai, Kazuo .  Variation of Molecular Gas Properties Across the Spiral Arms in IC 342: Large-Scale 13CO (1-0) Emission .  Publications of the Astronomical Society of Japan62 ( 5 ) 1261 - 1275   2010.10Variation of Molecular Gas Properties Across the Spiral Arms in IC 342: Large-Scale 13CO (1-0) EmissionReviewed

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  • Kaneko, H., Kuno, N., Iono, D., Tosaki, T., Sawada, T., Nakanishi, H., Hirota, A. .  Molecular Gas in the Early Stage of Interacting Galaxies: The NGC 4567/8 Pair .  Galaxy Wars: Stellar Populations and Star Formation in Interacting Galaxies ASP Conference Series423   26 - 26   2010.6Molecular Gas in the Early Stage of Interacting Galaxies: The NGC 4567/8 Pair

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  • Hirota, Akihiko,Kuno, Nario,Sato, N., Nakanishi, Hiroyuki, Tosaki, Tomoka, Matsui, Hidenori, Habe, Asao, Sorai, Kazuo .  Determination of the Pattern Speed of Barred Spiral Galaxies .  Publications of the Astronomical Society of Japan61 ( 3 ) 441 - 450   2009.6Determination of the Pattern Speed of Barred Spiral GalaxiesReviewed

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  • Egusa, Fumi, Kohno, Kotaro, Sofue, Yoshiaki, Nakanishi, Hiroyuki, Komugi, Shinya .  Determining Star Formation Timescale and Pattern Speed in Nearby Spiral Galaxies .  The Astrophysical Journal697 ( 2 ) 1870 - 1891   2009.6Determining Star Formation Timescale and Pattern Speed in Nearby Spiral GalaxiesReviewed

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  • McClure-Griffiths, N. M., Pisano, D. J., Calabretta, M. R., Ford, H. Alyson, Lockman, Felix J., Staveley-Smith, L., Kalberla, P. M. W., Bailin, J., Dedes, L., Janowiecki, S., Gibson, B. K., Murphy, T., Nakanishi, H., Newton-McGee, K. .  Gass: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data Release .  The Astrophysical Journal Supplement181 ( 2 ) 398 - 412   2009.4Gass: The Parkes Galactic All-Sky Survey. I. Survey Description, Goals, and Initial Data ReleaseReviewed

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  • Egusa, Fumi, Kohno, K., Sofue, Y., Nakanishi, H., Komugi, S. .  Star Formation Timescale and Pattern Speed in Nearby Spiral Galaxies .  American Astronomical Society41   323   2009.1Star Formation Timescale and Pattern Speed in Nearby Spiral Galaxies

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  • Komugi, S., Sofue, Y., Kohno, K., Nakanishi, H., Onodera, S., Egusa, F., Muraoka, K. .  Molecular Gas Distribution in Barred and Nonbarred Galaxies along the Hubble Sequence .  The Astrophysical Journal Supplement Series178 ( 2 ) 225 - 246   2008.10Molecular Gas Distribution in Barred and Nonbarred Galaxies along the Hubble SequenceReviewed

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  • Komugi, S., Sofue, Y., Onodera, S., Egusa, F., Muraoka, K., Nakanishi, H.,Young, J. S. .  The Star Formation Law as a Function of Galactic Properties .  Pathways Through an Eclectic Universe ASP Conference Series390   161 - 161   2008.6The Star Formation Law as a Function of Galactic Properties

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  • Iijima, T.,Nakanishi, H. .  Spectroscopic observations of the first helium nova V445 Puppis .  Astronomy and Astrophysics482 ( 3 ) 865 - 877   2008.5Spectroscopic observations of the first helium nova V445 PuppisReviewed

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  • Naomi M. McClure-Griffiths, Lister Staveley-Smith, Jay F. Lockman, Mark R. Calabretta, Alyson H. Ford, Peter M. W. Kalberla, Tara Murphy, Hiroyuki Nakanishi, D. J. Pisano .  An Interaction of a Magellanic Leading Arm High-Velocity Cloud with the Milky Way Disk .  The Astrophysical Journal673 ( 2 ) 143 - 146   2008.2An Interaction of a Magellanic Leading Arm High-Velocity Cloud with the Milky Way DiskReviewed

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  • Steven Janowiecki, S. Brunner, D. J. Pisano, F. J. Lockman, Naomi M. McClure-Griffiths, Alison Ford, Lister Staveley-Smith, Mark R. Calabretta, Tara Murphy, Peter M. W. Kalberla, Hiroyuki Nakanishi .  The GASS HI Survey And FIR Emission From The Magellanic Stream .  American Astronomical Society, AAS Meeting   2007.12The GASS HI Survey And FIR Emission From The Magellanic Stream

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  • Nario Kuno, Naoko Sato, Hiroyuki Nakanishi, Akihiko Hirota, Tomoka Tosaki, Yasuhiro Shioya, Kazuo Sorai, Naomasa Nakai, Kohta Nishiyama, Baltsar Vila-Vilaro .  Nobeyama CO Atlas of Nearby Spiral Galaxies .  Springer Science+Business Media   170 - 170   2007.9Nobeyama CO Atlas of Nearby Spiral Galaxies

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  • Shinya Komugi, Yoshiaki Sofue, Hiroyuki Nakanishi, Sachiko Onodera, Fumi Egusa, Kazuyuki Muraoka, Judith S. Young .  Molecular Gas and Star Formation in Nearby Galaxies .  Springer Science+Business Media   231 - 231   2007.9Molecular Gas and Star Formation in Nearby Galaxies

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  • Fumi Egusa, Yoshiaki Sofue, Hiroyuki Nakanishi, Shinya Komugi .  Determination of Pattern Speed and Star Formation Timescale in Nearby Spiral Galaxies .  Springer Science+Business Media   320 - 320   2007.9Determination of Pattern Speed and Star Formation Timescale in Nearby Spiral Galaxies

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  • Akihiko Hirota, Nario Kuno, Naoko Sato, Tomoka Tosaki, Hiroyuki Nakanishi, Kazuo Sorai .  GMCs in the Nearby Galaxy IC 342 .  Springer Science+Business Media   334 - 334   2007.9GMCs in the Nearby Galaxy IC 342

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  • Hiroyuki Nakanishi, Yoshiaki Sofue .  Three-Dimensional HI and H2 Gas Maps of the Milky Way Galaxy .  Springer Science+Business Media   363 - 363   2007.9Three-Dimensional HI and H2 Gas Maps of the Milky Way Galaxy

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  • Nario Kuno, Naoko Sato, Hiroyuki Nakanishi, Akihiko Hirota, Tomoka Tosaki, Yasuhiro Shioya, Kazuo Sorai, Naomasa Nakai, Kohta Nishiyama, Baltsar Vila-Vilaro .  Distribution of Molecular Gas in Barred Spiral Galaxies .  Proceedings of the International Astronomical Union 2   2007.4Distribution of Molecular Gas in Barred Spiral Galaxies

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  • Nario Kuno, Naoko Sato, Hiroyuki Nakanishi, Akihiko Hirota, Tomoka Tosaki, Yasuhiro Shioya, Kazuo Sorai, Naomasa Nakai, Kota Nishiyama, Baltsar Vila-Vilaro .  Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular Gas in Barred and Nonbarred Spiral Galaxies .  Publications of the Astronomical Society of Japan59 ( 1 ) 117 - 166   2007.2Nobeyama CO Atlas of Nearby Spiral Galaxies: Distribution of Molecular Gas in Barred and Nonbarred Spiral GalaxiesReviewed

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  • Shinya Komugi, Kotaro Kohno, Tomoka Tosaki, Hiroyuki Nakanishi, Sachiko Onodera, Fumi Egusa, Yoshiaki Sofue .  ASTE Observations of Nearby Galaxies: A Tight Correlation between CO J=3--2 Emission and Hα .  Publications of the Astronomical Society of Japan59 ( 1 ) 55 - 60   2007.2ASTE Observations of Nearby Galaxies: A Tight Correlation between CO J=3--2 Emission and HαReviewed

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  • H. J. Rocha-Pinto, S. R. Majewski, M. F. Skrutskie, R. J. Patterson, Hiroyuki Nakanishi, R. R. Munoz, Yoshiaki Sofue .  The Dog on the Ship: The Canis Major Dwarf Galaxy as an Outlying Part of the Argo Star System .  The Astrophysical Journal640 ( 2 ) 147 - 150   2006.4The Dog on the Ship: The Canis Major Dwarf Galaxy as an Outlying Part of the Argo Star SystemReviewed

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  • Shinya Komugi, Yoshiaki Sofue, Hiroyuki Nakanishi, Sachiko Onodera, Fumi Egusa .  The Schmidt Law at High Molecular Densities .  Publications of the Astronomical Society of Japan57 ( 5 ) 733 - 741   2005.10The Schmidt Law at High Molecular DensitiesReviewed

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  • Fumi Egusa, Yoshiaki Sofue, Hiroyuki Nakanishi .  Offsets between Hα and CO Arms of a Spiral Galaxy, NGC 4254: A New Method for Determining the Pattern Speed of Spiral Galaxies .  Publications of the Astronomical Society of Japan56 ( 6 ) 45 - 48   2004.12Offsets between Hα and CO Arms of a Spiral Galaxy, NGC 4254: A New Method for Determining the Pattern Speed of Spiral GalaxiesReviewed

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  • Hiroyuki Nakanishi, Yoshiaki Sofue .  Three-Dimensional Distribution of the Neutral Hydrogen Gas in the Milky Way Galaxy .  Proceedings of ASP Conference   2004.12Three-Dimensional Distribution of the Neutral Hydrogen Gas in the Milky Way Galaxy

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  • Hiroyuki Nakanishi .  A Method for Determining Two-dimensional Orbits In Galactic Disks .  The Astrophysical Journal617 ( 1 ) 315 - 321   2004.12A Method for Determining Two-dimensional Orbits In Galactic DisksReviewed

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  • Yoshiaki Sofue, Hiroyuki Nakanishi, Sachiko Onodera, Jin Koda, Kotaro Kohno .  High-resolution CO Survey of Virgo Spirals at Nobeyama --- Massive Cores inferred from Central Rotation Curves .  International Astronomical Union Symposium   2004.7High-resolution CO Survey of Virgo Spirals at Nobeyama --- Massive Cores inferred from Central Rotation Curves

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  • Nario Kuno, Naoko Sato, Hiroyuki Nakanishi, Aya Yamauchi, Naomasa Nakai, Nobuyuki Kawai .  Radio Observations of the Afterglow of GRB 030329 .  Publications of the Astronomical Society of Japan56 ( 2 ) 1 - 4   2004.4Radio Observations of the Afterglow of GRB 030329Reviewed

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  • Yoshiaki Sofue, Jin Koda, Hiroyuki Nakanishi, Sachiko Onodera, Kotaro Kohno, Akihiko Tomita,& Sachiko K. Okumura .  The Virgo High-Resolution CO Survey: I. CO Atlas .  Publications of the Astronomical Society of Japan55 ( 1 ) 17 - 58   2003.2The Virgo High-Resolution CO Survey: I. CO AtlasReviewed

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  • Yoshiaki Sofue, Jin Koda, Hiroyuki Nakanishi,& Sachiko Onodera .  The Virgo High-Resolution CO Survey: II. Rotation Curves and Dynamical Mass Distributions .  Publications of the Astronomical Society of Japan55 ( 1 ) 59 - 74   2003.2The Virgo High-Resolution CO Survey: II. Rotation Curves and Dynamical Mass DistributionsReviewed

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  • Yoshiaki Sofue, Jin Koda, Hiroyuki Nakanishi,& Makoto Hidaka, .  The Virgo High-Resolution CO Survey: III. NGC 4254 .  Publications of the Astronomical Society of Japan55 ( 1 ) 75 - 86   2003.2The Virgo High-Resolution CO Survey: III. NGC 4254Reviewed

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  • Jin Koda, Yoshiaki Sofue, Kotaro Kohno, Hiroyuki Nakanishi, Sachiko Onodera, Sachiko K. Okumura,& Judith A. Irwin .  Nobeyama Millimeter Array CO (J=1-0) Observations of the Hα/Radio Lobe Galaxy NGC 3079: Gas Dynamics in a Weak Bar Potential and Central Massive Core .  The Astrophysical Journal573 ( 1 ) 105 - 121   2002.7Nobeyama Millimeter Array CO (J=1-0) Observations of the Hα/Radio Lobe Galaxy NGC 3079: Gas Dynamics in a Weak Bar Potential and Central Massive CoreReviewed

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Books

  • シリーズ現代の天文学6 星間物質と星形成

    犬塚修一郎、臼井知史、大西利和、大向一行、岡本美子、尾中敬、釜谷秀幸、木村勇気、芝井広、新永浩子、高橋忠幸、田村眞一、田村元秀、坪井陽子、土橋一仁、富坂幸治、中井直正、中川貴雄、長田哲也、中西裕之、中村文隆、西亮一、花輪知幸、福井康雄、水野範和、水野亮、百瀬宗武、山崎了、山本智、山本哲生、米倉覚則( Role: Edit)

    日本評論社  2008.9 

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    Language:Japanese Book type:Scholarly book

  • シリーズ現代の天文学5 銀河II - 銀河系

    有本信雄、家正則、生田ちさと、泉浦秀行、河村晶子、小宮山裕、小山勝二、沢武文、祖父江義明、千葉柾司、辻本拓司、坪井昌人、土佐誠、長田哲也、中西裕之、半田利弘、本間希樹、牧野淳一郎、三好真、和田桂一( Role: Joint author)

    日本評論社  2007.4 

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    Language:Japanese Book type:Scholarly book

MISC

  • The JCMT BISTRO Survey: Studying the Complex Magnetic Field of L43

    Janik Karoly, Derek Ward-Thompson, Kate Pattle, David Berry, Anthony Whitworth, Jason Kirk, Pierre Bastien, Tao-Chung Ching, Simon Coude, Jihye Hwang, Woojin Kwon, Archana Soam, Jia-Wei Wang, Tetsuo Hasegawa, Shih-Ping Lai, Keping Qiu, Doris Arzoumanian, Tyler L. Bourke, Do-Young Byun, Huei-Ru Vivien Chen, Wen Ping Chen, Mike Chen, Zhiwei Chen, Jungyeon Cho, Minho Choi, Youngwoo Choi, Yunhee Choi, Antonio Chrysostomou, Eun Jung Chung, Sophia Dai, Victor Debattista, James Di Francesco, Pham Ngoc Diep, Yasuo Doi, Hao-Yuan Duan, Yan Duan, Chakali Eswaraiah, Lapo Fanciullo, Jason Fiege, Laura M. Fissel, Erica Franzmann, Per Friberg, Rachel Friesen, Gary Fuller, Ray Furuya, Tim Gledhill, Sarah Graves, Jane Greaves, Matt Griffin, Qilao Gu, Ilseung Han, Thiem Hoang, Martin Houde, Charles L. H. Hull, Tsuyoshi Inoue, Shu-ichiro Inutsuka, Kazunari Iwasaki, Il-Gyo Jeong, Doug Johnstone, Vera Konyves, Ji-hyun Kang, Miju Kang, Akimasa Kataoka, Koji Kawabata, Francisca Kemper, Jongsoo Kim, Shinyoung Kim, Gwanjeong Kim, Kyoung Hee Kim, Mi-Ryang Kim, Kee-Tae Kim, Hyosung Kim, Florian Kirchschlager, Masato I. N. Kobayashi, Patrick M. Koch, Takayoshi Kusune, Jungmi Kwon, Kevin Lacaille, Chi-Yan Law, Chang Won Lee, Hyeseung Lee, Yong-Hee Lee, Chin-Fei Lee, Jeong-Eun Lee, Sang-Sung Lee, Dalei Li, Di Li, Guangxing Li, Hua-bai Li, Sheng-Jun Lin, Hong-Li Liu, Tie Liu, Sheng-Yuan Liu, Junhao Liu, Steven Longmore, Xing Lu, A-Ran Lyo, Steve Mairs, Masafumi Matsumura, Brenda Matthews, Gerald Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nguyen Bich Ngoc, Nagayoshi Ohashi, Takashi Onaka, Geumsook Park, Harriet Parsons, Nicolas Peretto, Felix Priestley, Tae-Soo Pyo, Lei Qian, Ramprasad Rao, Jonathan Rawlings, Mark Rawlings, Brendan Retter, John Richer, Andrew Rigby, Sarah Sadavoy, Hiro Saito, Giorgio Savini, Masumichi Seta, Ekta Sharma, Yoshito Shimajiri, Hiroko Shinnaga, Mehrnoosh Tahani, Motohide Tamura, Ya-Wen Tang, Xindi Tang, Kohji Tomisaka, Le Ngoc Tram, Yusuke Tsukamoto, Serena Viti, Hongchi Wang, Jintai Wu, Jinjin Xie, Meng-Zhe Yang, Hsi-Wei Yen, Hyunju Yoo, Jinghua Yuan, Hyeong-Sik Yun, Tetsuya Zenko, Guoyin Zhang, Yapeng Zhang, Chuan-Peng Zhang, Jianjun Zhou, Lei Zhu, Ilse de Looze, Philippe Andre, C. Darren Dowell, David Eden, Stewart Eyres, Sam Falle, Valentin J. M. Le Gouellec, Frederick Poidevin, Jean-Francois Robitaille, Sven van Loo

    2023.5

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    We present observations of polarized dust emission at 850 $\mu$m from the L43
    molecular cloud which sits in the Ophiuchus cloud complex. The data were taken
    using SCUBA-2/POL-2 on the James Clerk Maxwell Telescope as a part of the
    BISTRO large program. L43 is a dense ($N_{\rm H_2}\sim 10^{22}$-10$^{23}$
    cm$^{-2}$) complex molecular cloud with a submillimetre-bright starless core
    and two protostellar sources. There appears to be an evolutionary gradient
    along the isolated filament that L43 is embedded within, with the most evolved
    source closest to the Sco OB2 association. One of the protostars drives a CO
    outflow that has created a cavity to the southeast. We see a magnetic field
    that appears to be aligned with the cavity walls of the outflow, suggesting
    interaction with the outflow. We also find a magnetic field strength of up to
    $\sim$160$\pm$30 $\mu$G in the main starless core and up to $\sim$90$\pm$40
    $\mu$G in the more diffuse, extended region. These field strengths give
    magnetically super- and sub-critical values respectively and both are found to
    be roughly trans-Alfv\'enic. We also present a new method of data reduction for
    these denser but fainter objects like starless cores.

    DOI: 10.3847/1538-4357/acd6f2

    arXiv

    researchmap

    Other Link: http://arxiv.org/pdf/2305.11306v2

  • 臼田64m鏡によるOH輝線観測のためのL帯受信機開発

    深谷直史, 山本宏昭, 石川竜巳, 松月大和, 村田泰宏, 坪井昌人, 中西裕之, 今井裕, 蔵原昂平

    日本天文学会年会講演予稿集   2023   2023

  • 臼田64m鏡によるOH輝線観測に向けた整備 2:進捗報告

    山本宏昭, 深谷直史, 石川竜巳, 松月大和, 大野知希, 村田泰宏, 坪井昌人, 中西裕之, 今井裕, 蔵原昂平

    日本天文学会年会講演予稿集   2023   2023

  • 臼田64m鏡を用いたL帯OH輝線観測にむけた整備

    山本宏昭, 村田泰宏, 坪井昌人, 中西裕之, 今井裕, 中川亜紀治, 蔵原昂平, 須藤広志

    日本天文学会年会講演予稿集   2021   2021

  • Three-dimensional distributions of atomic and molecular hydrogen gases in the Milky Way Galaxy

    Hiroyuki Nakanishi

    天文月報   2005.10

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    Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

Presentations

  • 中西裕之   Study on the molecular fraction of H I clouds using the FUGIN and VGPS survey data   International conference

    SKA Our Galaxy Online zoominar  2020.12 

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    Event date: 2020.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:オンライン  

  • 中西裕之、藤田真司、立原研悟、泉奈津子、松尾光洋、梅本智文、大朝由美子、井上剛志   "野辺山45m 鏡FOREST 受信機による銀河面CO サーベイデータを用いた分 子雲形成の観測的研究"  

    日本天文学会2020年秋季年会  2020.9  日本天文学会

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:弘前大学(オンライン開催)  

  • 中西裕之   HI・COデータによる分子雲形成に関する研究  

    SKA-Japanシンポジウム 2019  2019.11 

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    Event date: 2019.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:国立天文台三鷹キャンパス  

  • 藏原 昂平, 中西 裕之, 工藤 祐己   電波偏波観測データによる近傍渦巻銀河の大局的磁場構造I: 磁場ベクトルマップの作成法  

    日本天文学会2019年秋季年会  2019.9  日本天文学会

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:熊本大学  

  • Study on neutral hydrogen clouds in the outer Galactic disk   International conference

    East Asia SKA Science Workshop 2019  2019.5 

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    Event date: 2019.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:China  

  • Nakanishi H.   Magnetic field vector maps of nearby spiral galaxies   International conference

    THE POWER OF FARADAY TOMOGRAPHY --- TOWARDS 3D MAPPING OF COSMIC MAGNETIC FIELDS ---  2018.5 

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    Event date: 2018.5 - 2018.6

    Language:English   Presentation type:Oral presentation (general)  

  • 中西 裕之   SWG3 分子ガス形成   Invited

    Science Workshop 2018 on FUGIN: The Galactic Plane Legacy Survey for Molecular Clouds  2018.2 

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    Event date: 2018.2

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:名古屋大学  

  • 中西 裕之   最新データに基づく回転曲線の測定   Invited

    天の川銀河研究会 2017  2017.10 

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    Event date: 2017.10

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:鹿児島大学  

  • Study on evolution of molecular gas fraction based on CO stacking analysis   Invited

    NRO45m/ASTE Single Dish Science Workshop 2017  2017.8 

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

  • Hiroyuki NAKANISHI and Japan SKA consortium members   SKA Project and Related Works in Japan   Invited International conference

    Thailand-Japan Microwave 2017 (TJMW2017)  2017.6 

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    Event date: 2017.6

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:King Mongkut's University of Technology Thonburi   Country:Thailand  

  • 中西 裕之   鹿児島大学における小型インターネット望遠鏡開発状況  

    "第7回インターネット望遠鏡プロジェクト・シンポジウム「インターネット望遠鏡を利用した天文学教育の可能性」 "  2017.5 

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    Event date: 2017.5

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学日吉キャンパス来往者シンポジウムスペース  

  • H. Nakanishi   THE HI AND H2 DISTRIBUTIONS IN THE MILKY WAY GALAXY   Invited International conference

    IRAP Seminars  2016.9  L'Institut de Recherche en Astrophysique et Planétologie

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    Event date: 2016.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Toulouse   Country:France  

  • Hiroyuki Nakanishi   Molecular fraction of gaseous disks of nearby spiral galaxies   International conference

    Nagoya Workshop on the Interstellar Hydrogen  Nagoya Workshop on the Interstellar Hydrogen

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    Event date: 2015.3

    Language:English  

    Venue:Nadya Park, Sakae, Nagoya city  

    国際学会

  • 中西裕之, 齊田智恵(鹿児島大学), 村田泰宏, 坪井昌人(宇宙科学研究所), 米倉覚則(茨城大学), 土橋一仁(東京学芸大学), ほか臼田64m鏡ライン観測WGメンバー   臼田宇宙空間観測所64m電波望遠鏡による中性水素原子ガス21cm線の観測  

    日本天文学会2014年秋季年会  日本天文学会2014年秋季年会

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    Event date: 2014.9

    Language:Japanese  

    Venue:山形大学  

    国内学会

  • 中西裕之   SKA時代に向けた45m鏡への期待  

    野辺山ユーザーズミーティング  野辺山ユーザーズミーティング

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    Event date: 2014.7

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    研究会

  • 中西裕之 、南谷哲宏、西村淳、岩田一正、松尾光洋、中原啓貴、久野成夫、梅本智文   ROACHボードによるFOREST用バックエンドの開発  

    野辺山ユーザーズミーティング  野辺山ユーザーズミーティング

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    Event date: 2014.7

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    研究会

  • 中西裕之   臼田64m鏡によるセンチ波天文学 ~臼田からSKAへ  

    JAXAのアンテナの科学観測利用に関するワークショップ  JAXAのアンテナの科学観測利用に関するワークショップ

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    Event date: 2014.1

    Language:Japanese  

    Venue:宇宙科学研究所  

    研究会

  • 中西裕之   SKAおよびSKA-JPの紹介  

    理論懇シンポジウム  理論懇シンポジウム

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    Event date: 2013.12

    Language:Japanese  

    Venue:東京大学柏キャンパス  

    研究会

  • 中西裕之   SKAおよびSKA-JPの活動  

    VLBI懇談会シンポジウム  VLBI懇談会シンポジウム

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    Event date: 2013.12

    Language:Japanese  

    Venue:筑波大学  

    国内学会

  • 中西裕之   SKA概要・重要文書  

    宇宙電波懇談会シンポジウム  宇宙電波懇談会シンポジウム

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    Event date: 2013.12

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    研究会

  • 中西裕之   SKA計画およびSKA-JPの活動  

    VERAユーザーズミーティング2013  VERAユーザーズミーティング2013

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    Event date: 2013.10

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    国内学会

  • 中西裕之   SKA-related activities in Japan   International conference

    9th East Asian Meeting on Astronomy  9th East Asian Meeting on Astronomy

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    Event date: 2013.10

    Language:English  

    Venue:台湾、台北  

    国際学会

  • 中西裕之   Wide Field Imaging for Nearby Galaxies   International conference

    2013 EA ALMA Development Workshop  2013 EA ALMA Development Workshop

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    Event date: 2013.7

    Language:English  

    Venue:国立天文台  

    国際学会

  • 中西裕之   ROACHボードによるFOREST用デジタル分光計開発計画  

    野辺山ユーザーズミーティング  野辺山ユーザーズミーティング

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    Event date: 2013.7

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    研究会

  • 中西裕之   CASPERおよびROACHボードの紹介とFOREST用デジタル分光計開発計画  

    野辺山宇宙電波観測所談話会  野辺山宇宙電波観測所談話会

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    Event date: 2013.5

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    その他

  • 中西裕之   多波長データで探る渦状腕銀河星間ガスの分子ガス-原子ガス比  

    九州天文セミナー  九州天文セミナー

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    Event date: 2013.4

    Language:Japanese  

    Venue:九州大学  

    研究会

  • 中西裕之   SKA Review & 宇電懇および将来計画の報告  

    日本SKAサイエンス会議 「銀河進化と遠方宇宙」2013(第1回)  日本SKAサイエンス会議 「銀河進化と遠方宇宙」2013(第1回)

     More details

    Event date: 2013.2

    Language:Japanese  

    Venue:京都府京都市  

    研究会

  • 中西裕之   SKA: Square Kilometer Array  

    学術会議シンポジウム  学術会議シンポジウム

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    Event date: 2013.1

    Language:Japanese  

    Venue:東京大学  

    研究会

  • 中西裕之   SKA-JP開発の現状  

    宇宙電波懇談会シンポジウム  宇宙電波懇談会シンポジウム

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    Event date: 2012.12

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    研究会

  • 中西裕之   SKAおよびSKA-JP報告  

    VERAユーザーズミーティング2012  VERAユーザーズミーティング2012

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    Event date: 2012.10

    Language:Japanese  

    Venue:国立天文台水沢VLBI観測所  

    研究会

  • 中西裕之   天の川銀河21cmサーベイ  

    天の川銀河研究会2012  天の川銀河研究会2012

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    Event date: 2012.9

    Language:Japanese  

    Venue:鹿児島大学理学部  

    研究会

  • 中西裕之   VERAによるペルセウス座腕星形成領域IRAS21379+5106の年周視差測定  

    日本天文学会秋季年会  日本天文学会秋季年会

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    Event date: 2012.9

    Language:Japanese  

    Venue:大分大学  

    国内学会

  • 中西裕之   SKAおよびSKAJPについて  

    日本SKAサイエンス会議「宇宙磁場」2012(第1回)  日本SKAサイエンス会議「宇宙磁場」2012(第1回)

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    Event date: 2012.7

    Language:Japanese  

    Venue:福岡県  

    研究会

  • 中西裕之   SKAおよびSKA-JP近況報告  

    NROユーザーズミーティング  NROユーザーズミーティング

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    Event date: 2012.7

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    研究会

  • 中西裕之   宇宙磁場観測のための受信システムについて  

    日本SKAサイエンス会議「宇宙磁場」2012(第1回)  日本SKAサイエンス会議「宇宙磁場」2012(第1回)

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    Event date: 2012.7

    Language:Japanese  

    Venue:福岡県福岡市  

    研究会

  • 中西裕之   Wide-band cm-Wavelength Observations with SKA   International conference

    The 5th East Asia VLBI workshop 2012  The 5th East Asia VLBI workshop 2012

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    Event date: 2012.5

    Language:English  

    Venue:台湾 台北  

    国際学会

  • 中西裕之(鹿児島大学)、日本SKAコンソーシアム   Square Kilometer Arrayおよび国内外における活動  

    日本天文学会2011年春季年会  日本天文学会2011年春季年会

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    Event date: 2011.3

    Language:Japanese  

    Venue:筑波大学  

    国内学会

  • 中西裕之   センチ波電波観測の重要性  

    2010 年度 VLBI 懇談会シンポジウム「VLBI懇談会設立20周年シンポジウム ~VLBI の現在、過去、未来~」  2010 年度 VLBI 懇談会シンポジウム「VLBI懇談会設立20周年シンポジウム ~VLBI の現在、過去、未来~」

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    Event date: 2010.12

    Language:Japanese  

    Venue:茨城大学 宇宙科学教育研究センター 宇宙電波館  

    研究会

  • 中西裕之   センチ波電波天文学の将来計画 ~Square Kilometer Array を中心として~  

    宇宙線研究所共同利用研究会「ガンマ線天文学 ~日本の戦略~」  宇宙線研究所共同利用研究会「ガンマ線天文学 ~日本の戦略~」

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    Event date: 2010.11

    Language:Japanese  

    Venue:東京大学 柏キャンパス  

    国内学会

  • 中西裕之   Japan SKA Consortium and its Activity   International conference

    8-th EAMA (East Asian Astronomy Meeting) Symposium “East Asian Network of Astronomy: Research, Education, and Popularization”  8-th EAMA (East Asian Astronomy Meeting) Symposium “East Asian Network of Astronomy: Research, Education, and Popularization”

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    Event date: 2010.10

    Language:English  

    Venue:中国 上海  

    国際学会

  • 中西裕之(鹿児島大学)、亀谷収、萩原喜昭(国立天文台) Japan SKA consortium   SKAプロジェクトの概況およびSKA-JPの活動報告  

    日本天文学会2010年秋季年会  日本天文学会2010年秋季年会

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    Event date: 2010.9

    Language:Japanese  

    Venue:金沢大学  

    国内学会

  • 中西裕之   CO observations for cluster galaxies~ galaxy evolution under cluster environmental effect ~  

    NROワークショップ "ALMA初期科学運用に向けて(近傍銀河関係)"  NROワークショップ "ALMA初期科学運用に向けて(近傍銀河関係)"

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    Event date: 2010.9

    Language:Japanese  

    Venue:東京大学天文学教育研究センター  

    研究会

  • 中西裕之   OBSERVATION OF THE UNIVERSE WITH ULTRA WIDEBAND RECEIVER AND SKA   International conference

    2010 Asia-Pacific Radio Science Conference (AP-RASC'10)  2010 Asia-Pacific Radio Science Conference (AP-RASC'10)

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    Event date: 2010.9

    Language:English  

    Venue:富山国際会議場  

    国際学会

  • 中西裕之   Japan SKA consortiumの活動およびSKAによるサイエンス  

    VERAユーザーズミーティング2010  VERAユーザーズミーティング2010

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    Event date: 2010.9

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    研究会

  • 中西裕之   Past, Present, and Future of Radio Astronomy   International conference

    The 4th. Japan-Korea Young Astronomers Meeting (JKYAM) 2010  The 4th. Japan-Korea Young Astronomers Meeting (JKYAM) 2010

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    Event date: 2010.8

    Language:English  

    Venue:神奈川県三浦市  

    国際学会

  • 中西裕之   SKAおよび国内SKA活動の近況  

    野辺山ユーザーズミーティング  野辺山ユーザーズミーティング

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    Event date: 2010.7

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    研究会

  • 中西裕之   Japan SKA consortium and its activity   International conference

    East Asia VLBI Workshop 2010  East Asia VLBI Workshop 2010

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    Event date: 2010.4

    Language:English  

    Venue:鹿児島大学  

    国際学会

  • 中西裕之   Square Kilometer Array  

    宇宙電波懇談会シンポジウム  宇宙電波懇談会シンポジウム

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    Event date: 2009.9

    Language:Japanese  

    Venue:東京大学  

    研究会

  • 中西裕之   SKAの概要およびJapan SKA consortiumの活動  

    野辺山ユーザーズミーティング  野辺山ユーザーズミーティング

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    Event date: 2009.7

    Language:Japanese  

    Venue:国立天文台野辺山宇宙電波観測所  

    研究会

  • 中西裕之(鹿児島大)、萩原喜昭(NAOJ)、大田泉(近畿大)、徂徠和夫(北海道大)、ほかJapan SKA consortiumメンバー   Square Kilometer Arrayと国内での活動  

    日本天文学会2009年春季年会  日本天文学会2009年春季年会

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    Event date: 2009.3

    Language:Japanese  

    Venue:大阪府立大学  

    国内学会

  • 中西裕之、江草芙実、三戸洋之 、鈴木豊、小麥真也 、中田好一 、小野寺幸子 、青木勉、祖父江義明 、神鳥亮、小林尚人、宮田隆志、長谷川隆、Joss Bland-Hawthorn   Kiso Outer Galaxy Survey  

    銀河系研究会2009 ~銀河系外縁部のサイエンス~  銀河系研究会2009 ~銀河系外縁部のサイエンス~

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    Event date: 2009.3

    Language:Japanese  

    Venue:鹿児島大学  

    研究会

  • 中西裕之   SKA計画の概要と国内での取り組み  

    VLBI懇談会シンポジウム「VSOP-2の成功と発展に向けて」  VLBI懇談会シンポジウム「VSOP-2の成功と発展に向けて」

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    Event date: 2008.12

    Language:Japanese  

    Venue:岐阜大学  

    研究会

  • 中西裕之   SKAによる銀河系・近傍銀河HI観測  

    SKAワークショップ08 ~SKAに向けたサイエンスと技術開発~  SKAワークショップ08 ~SKAに向けたサイエンスと技術開発~

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    Event date: 2008.11

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    国内学会

  • 中西裕之   SKAコンソーシャムと最近の活動  

    SKAワークショップ08 ~SKAに向けたサイエンスと技術開発~  SKAワークショップ08 ~SKAに向けたサイエンスと技術開発~

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    Event date: 2008.11

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    研究会

  • 中西裕之   Square Kilometer Array計画  

    宇宙線研セミナー  宇宙線研セミナー

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    Event date: 2008.10

    Language:Japanese  

    Venue:東京大学宇宙線研究所  

    その他

  • 中西裕之、鈴木豊、三戸洋之 、岩田生、尾崎忍夫、中田好一 、小麥真也 、Joss Bland-Hawthorn、江草 芙実、小野寺幸子 、青木勉、祖父江義明 、神鳥亮、小林尚人、宮田隆志   KOOLSによる銀河系外縁部OB型候補星の分光追観測   International conference

    岡山ユーザーズミーティング  岡山ユーザーズミーティング

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    Event date: 2008.8

    Language:English  

    Venue:国立天文台三鷹キャンパス  

    国際学会

  • 中西裕之、面高俊宏、荒尾洋考、鹿児島大光赤外1mグループ   鹿児島大学 光赤外1m望遠鏡  

    2008年度岡山ユーザーズミーティング  2008年度岡山ユーザーズミーティング

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    Event date: 2008.8

    Language:Japanese  

    Venue:国立天文台三鷹キャンパス  

    研究会

  • 中西裕之   銀河系研究から提案するALMAでの観測  

    銀河ショップALMA(第5回)/ALMA-JT銀河subWG(2008年度・第3回)  銀河ショップALMA(第5回)/ALMA-JT銀河subWG(2008年度・第3回)

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    Event date: 2008.7

    Language:Japanese  

    Venue:鹿児島大学  

    研究会

  • 中西裕之   Square Kilometer Array (SKA)  

    第2回学術会議シンポジウム「天文学・宇宙物理学の展望 -長期計画の策定へ向けて-」  第2回学術会議シンポジウム「天文学・宇宙物理学の展望 -長期計画の策定へ向けて-」

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    Event date: 2008.5

    Language:Japanese  

    Venue:東京大学  

    研究会

  • Hiroyuki Nakanishi, Yoshiaki Sofue, Kazuo Sorai   CO Observations for Cluster of Galaxies with NMA, 45m, and ALMA   International conference

    The 4th Japan-Taiwan ALMA Science Meeting  The 4th Japan-Taiwan ALMA Science Meeting

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    Event date: 2008.4

    Language:English  

    Venue:茨城大学  

    国際学会

  • 中西 裕之、廣田晶彦、幸田仁、Jeffery Kenney、小野寺幸子、佐藤奈穂子、江草芙実、小麥真也、久野成夫、祖父江義明   HIガスが剥ぎ取られつつある銀河NGC4522のCO観測  

    日本天文学会2008年春季年会  日本天文学会2008年春季年会

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    Event date: 2008.3

    Language:Japanese  

    Venue:国立オリンピック記念青少年総合センター  

    国内学会

  • Hiroyuki Nakanishi   Three dimensional distributions of HI and H2 gases in the Galaxy  

    Annual Scientific Meeting and General Meeting of the Astronomical Society of Australia  Annual Scientific Meeting and General Meeting of the Astronomical Society of Australia

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    Event date: 2007.7

    Language:Japanese  

    Venue:オーストラリア  

    国内学会

  • Hiroyuki Nakanishi   Kiso Outer Galaxy Survey: Stellar Radial Distribution of the Galaxy   International conference

    Galaxies in the Local Volume  Galaxies in the Local Volume

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    Event date: 2007.7

    Language:English  

    Venue:オーストラリア  

    国際学会

  • 中西 裕之、涛崎 智佳、河野 孝太郎、祖父江 義明、久野 成夫   ASTEによる楕円銀河の12CO(J=3--2)輝線探査  

    日本天文学会2007年春季年会  日本天文学会2007年春季年会

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    Event date: 2007.3

    Language:Japanese  

    Venue:神奈川  

    国内学会

  • 中西 裕之、江草 芙実、三戸 洋之、小麦真也、中田好一、小野寺幸子、青木勉、祖父江義明、神鳥亮、小林尚人、宮田隆志   Kiso Outer Galaxy Survey -銀河系外縁部における星分布の調査  

    日本天文学会2006年秋季年会  日本天文学会2006年秋季年会

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    Event date: 2006.9

    Language:Japanese  

    Venue:福岡  

    国内学会

  • Hiroyuki Nakanishi, Yoshiaki Sofue   Three-Dimensional HI and H2 Gas Maps of the Milky Way Galaxy   International conference

    Mapping the Galaxy and Nearby Galaxies  Mapping the Galaxy and Nearby Galaxies

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    Event date: 2006.6

    Language:English  

    Venue:沖縄  

    国際学会

  • Akihiko Hirota, Nario Kuno, Naoko Sato, Tomoka Tosaki, Hiroyuki Nakanishi, Kazuo Sorai   GMCs in the Nearby Galaxy IC 342   International conference

    Mapping the Galaxy and Nearby Galaxies  Mapping the Galaxy and Nearby Galaxies

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    Event date: 2006.6

    Language:English  

    Venue:沖縄  

    国際学会

  • Nario Kuno, Naoko Sato, Hiroyuki Nakanishi, Akihiko Hirota, Tomoka Tosaki, Yasuhiro Shioya, Kazuo Sorai, Naomasa Nakai, Kohta Nishiyama, Baltsar Vila-Vilaro   Nobeyama CO Atlas of Nearby Spiral Galaxies   International conference

    Mapping the Galaxy and Nearby Galaxies  Mapping the Galaxy and Nearby Galaxies

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    Event date: 2006.6

    Language:English  

    Venue:沖縄  

    国際学会

  • Shinya Komugi, Yoshiaki Sofue, Hiroyuki Nakanishi, Sachiko Onodera, Fumi Egusa, Kazuyuki Muraoka, Judith S. Young   Molecular Gas and Star Formation in Nearby Galaxies   International conference

    Mapping the Galaxy and Nearby Galaxies  Mapping the Galaxy and Nearby Galaxies

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    Event date: 2006.6

    Language:English  

    Venue:沖縄  

    国際学会

  • Fumi Egusa, Yoshiaki Sofue, Hiroyuki Nakanishi, Shinya Komugi   Determination of Pattern Speed and Star Formation Timescale in Nearby Spiral Galaxies   International conference

    Mapping the Galaxy and Nearby Galaxies  Mapping the Galaxy and Nearby Galaxies

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    Event date: 2006.6

    Language:English  

    Venue:沖縄  

    国際学会

  • 中西 裕之、祖父江 義明   天の川銀河の中性水素原子・分子の3次元分布  

    日本天文学会2006年春季年会  日本天文学会2006年春季年会

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    Event date: 2006.3

    Language:Japanese  

    Venue:和歌山  

    国内学会

  • 中西 裕之、久野 成夫、祖父江 義明、佐藤奈穂子、中井 直正、塩谷 泰広、濤崎 智佳、小野寺 幸子、徂徠 和夫、江草芙実、廣田晶彦   おとめ座銀河団銀河のCO・HI観測  

    日本天文学会2005年秋季年会  日本天文学会2005年秋季年会

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    Event date: 2005.10

    Language:Japanese  

    Venue:北海道  

    国内学会

  • Hiroyuki Nakanishi, Nario Kuno, Yoshiaki Sofue, Naoko Sato, Naomasa Nakai, Yasuhiro Shioya, Tomoka Tosaki, Sachiko Onodera, Kazuo Sorai, Fumi Egusa, Akihiko Hirota   Environmental effects on gaseous disks of Virgo spiral galaxies   International conference

    the dusty and molecular universe: a prelude to Herschel and ALMA  the dusty and molecular universe: a prelude to Herschel and ALMA

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    Event date: 2004.10

    Language:English  

    Venue:フランス  

    国際学会

  • 中西 裕之、久野 成夫、祖父江 義明、佐藤 奈穂子、小野寺 幸子、江草芙実、濤崎 智佳、塩谷 泰広、徂徠 和夫、中井 直正   Environmental Effect on Gaseous Disks of the Virgo Spirals  

    日本天文学会2004年秋季年会  日本天文学会2004年秋季年会

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    Event date: 2004.9

    Language:Japanese  

    Venue:岩手  

    国内学会

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Intellectual Property

  • 離散信号処理装置、デジタル分光計及び離散信号処理方法

    中原瑳衣子, 中西裕之

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    Applicant:国立大学法人鹿児島大学

    Application no:特願2019-116905  Date applied:2019.6

    Announcement no:特開2021-005118  Date announced:2021.1

  • 離散信号処理装置、デジタル分光計及び離散信号処理方法

    中西裕之, 中原瑳衣子

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    Applicant:国立大学法人鹿児島大学

    Application no:特願2019-116905  Date applied:2019.6

    Announcement no:特開2021-005118  Date announced:2021.1

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Awards

  • ベストティーチャー賞

    2020.7   鹿児島大学  

    中西裕之

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  • 日本天文学会欧文研究報告論文賞

    2020.1   日本天文学会   Three-dimensional distribution of the ISM in the Milky Way galaxy. III. The total neutral gas disk

    中西裕之,祖父江義明

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • 日本天文学会欧文研究報告論文賞

    2020.1   日本天文学会  

    中西裕之,祖父江義明

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Research Projects

  • インターネット望遠鏡のブラジルへの設置および「課題バンク(南半球版)」の開発

    Grant number:23K02794  2023.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    戸田 晃一, 山本 裕樹, 中西 裕之, 櫛田 淳子, 上田 晴彦, 澤渡 信之, 中村 厚

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

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  • Magnetic field structures of spiral galaxies studied by polarization observations with single dish telescope

    Grant number:21K03618  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4030000 ( Direct Cost: \3100000 、 Indirect Cost:\930000 )

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  • インターネット望遠鏡の南半球への設置および「ITP課題バンク」の開発

    Grant number:20K03278  2020.4 - 2023.3

    日本学術振興会  科学研究費補助金  基盤研究(C)

    戸田 晃一

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    インターネット望遠鏡システムとは,遠隔地に設置された望遠鏡をインターネット経由でコントロールし,さまざまな天体を観測するための装置と操作システムのことである。2003年度より北半球の複数箇所(日本,米国,イタリア)に設置し,自宅や教育現場にて無料で利用されている実績が数多くある。南半球に設置すれば,北半球への設置分と相互活用でき,24時間常時天体観測が地球規模で可能となる。本研究課題において,(南半球では最初となる)ブラジル国内の複数箇所にインターネット望遠鏡システムを設置するための基礎調査を,2020年度は新型コロナウイルス感染症の甚大な影響の中ではあるが,可能な限りオンライン形式により行った。
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    インターネット望遠鏡システムによる天体観察を教育現場により普及させるために,小学校から高等学校までの各学年で“使える”観測テーマの事例を無料で公開をする仕組みである「課題バンク」を開発している。2020年度には,作成するためのカテゴリ(テーマ)を決め,各テーマ毎にいくつかの「課題」を作成することができた。また,「課題バンク」を公開するホームページを整備し,新型コロナウイルス感染症の甚大な影響の中ではあるが,試験的に運用を開始することができた。
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    インターネット望遠鏡システムの設置費用を抑えるために,インターネット望遠鏡システムの小型化の取り組みを始めた。試作機の開発を現在行っている。毎年度開催している「インターネット望遠鏡プロジェクトに関するシンポジウム」を2020年度も(,オンライン形式ではあったが,)開催し,本研究課題の研究成果の公表や関連する研究活動および教育活動の実践報告をした。

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  • Revealing the origin of dark gas around molecular clouds using the velocity-dispersion method

    Grant number:26287030  2014.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    DOBASHI Kazuhito

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    Grant amount:\16120000 ( Direct Cost: \12400000 、 Indirect Cost:\3720000 )

    The purpose of our study is to quantify the components of “dark gas”. The dark gas is the gas which can be detected by the far-infrared dust emission or by gamma-ray, but cannot be traced by the HI 21cm line nor CO emission lines, and it is known to be abundant around dense molecular clouds. The origin of the dark gas should be either optically thick cold HI gas or diffuse molecular gas (H2) which cannot form or excite CO molecules. Using the new method that we named “velocity-dispersion method”, we analyzed the 21cm and CO emission lines around the Taurus molecular cloud, and found that the fraction of the cold HI gas in the dark gas is about 20%, and therefore the rest (~80%) of the dark gas should be the diffuse molecular gas without CO emission.

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  • 螺旋運動する中性水素原子ガスおよび銀河磁場の観測的研究

    Grant number:26800104  2014.4 - 2016.3

    科学研究費補助金  若手研究(B)

  • 渦巻銀河における力学的構造および進化の観測的研究

    2003.4 - 2005.3

    科学研究費補助金  特別研究員奨励費

  • 銀河系および近傍渦巻銀河の観測的研究

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    主に電波や可視光のデータを用いて銀河系の三次元的な大規模構造について研究している。また近傍銀河団にある渦巻銀河の星間ガスの物理的性質について研究している。

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  • Radio astronomy, Galactic astronomy

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Teaching Experience

  • 現代天文学特論

    2020.10
    Institution:鹿児島大学

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    Level:Postgraduate 

  • 現代天文学特論

    2020
    Institution:鹿児島大学

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  • 複素解析

    2020
    Institution:鹿児島大学

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  • 宇宙のすがた

    2019.4
    Institution:鹿児島大学

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    Level:Undergraduate (liberal arts) 

  • 宇宙のすがた

    2019.4
    Institution:鹿児島大学

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    Level:Undergraduate (liberal arts) 

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  • 天体観測実習

    2018.10
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 天体観測実習

    2018.10
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

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  • 輻射の物理学

    2018.4
    -
    2021.8
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 輻射の物理学

    2018
    Institution:鹿児島大学

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  • 波と振動の物理学

    2017.10
    -
    2022.2
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 物理学基礎AI

    2017.4
    -
    2020.8
    Institution:鹿児島大学

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    Level:Undergraduate (liberal arts) 

  • 複素解析

    2017.4
    -
    2017.8
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 波と振動の物理学

    2017
    Institution:鹿児島大学

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  • 物理数学II

    2015.10
    -
    2016.2
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 宇宙情報システム

    2015.4
    -
    2017.8
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 物理数学I

    2015.4
    -
    2015.8
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 物理数学

    2014.10
    -
    2015.2
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 物理学基礎AII

    2013.4
    -
    2013.8
    Institution:鹿児島大学

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    Level:Undergraduate (liberal arts) 

  • 宇宙科学基礎演習

    2012.10
    -
    2016.2
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 情報物理演習 I

    2012.10
    -
    2014.2
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 物理学基礎AI

    2012.4
    -
    2015.8
    Institution:鹿児島大学

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    Level:Undergraduate (liberal arts) 

  • 物理学演習 I

    2012.4
    -
    2012.8
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

  • 物理学基礎AI

    2012
    -
    2019
    Institution:鹿児島大学

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  • 物理学基礎BII

    2009.4
    -
    2012.8
    Institution:鹿児島大学

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    Level:Undergraduate (liberal arts) 

  • 物理学基礎BII

    2009
    -
    2021
    Institution:鹿児島大学

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  • 宇宙物理学特論

    2009
    -
    2019
    Institution:鹿児島大学

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  • 宇宙物理学特論

    2008.4
    -
    2020.2
    Institution:鹿児島大学

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    Level:Postgraduate 

  • 天文学概論

    2008.4
    -
    2010.8
    Institution:鹿児島大学

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    Level:Undergraduate (specialized) 

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Media Coverage

  • 銀河団ジェット磁場が影響 Newspaper, magazine

    南日本新聞  南日本新聞  2021.5

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    Author:Other 

  • 銀河団ジェット磁場が影響 Newspaper, magazine

    南日本新聞  南日本新聞  2021.5

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    Author:Other 

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  • (オセモコ)鹿児島サイエンスカフェ・ノート Newspaper, magazine

    南日本新聞  南日本新聞  2020.10

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    Author:Myself 

  • 中西氏天文学会論文賞 Newspaper, magazine

    南日本新聞  南日本新聞  2020.10

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    Author:Other 

Academic Activities

  • 学術論文査読

    Role(s): Peer review

    PASJ, ApJ 

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    Type:Peer review 

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