研究者詳細 - 高桑　繁久

論文 - 高桑　繁久

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Ohata Y., Kakimoto H., Seki Y., Ishihara Y., Nakano Y., Yamamoto K., Takeyari S., Fujiwara M., Kitaoka T., Takakuwa S., Kubota T., Ozono K. . Pathogenic variants of the GNAS gene introduce an abnormal amino acid sequence in the β6 strand/α5 helix of Gsα, causing pseudohypoparathyroidism type 1A and pseudopseudohypoparathyroidism in two unrelated Japanese families . Bone Reports17 101637 2022年12月

記述言語：日本語出版者・発行元：Bone Reports

Pseudohypoparathyroidism 1A (PHP1A) and pseudopseudohypoparathyroidism (PPHP) are caused by loss-of-function variants of GNAS, which encodes Gsα. We present two unrelated Japanese families with PHP1A and PPHP harboring unreported pathogenic variants of GNAS (c.1141delG, p.Asp381Thrfs*23 and c.1117delC, p.Arg373Alafs*31). These variants introduce abnormal amino acids in the β6 strand/α5 helix of Gsα, which interact with G protein coupling receptor (GPCR). We conclude that these variants alter the association of Gsα with GPCR and cause PHP1A or PPHP.

DOI： 10.1016/j.bonr.2022.101637

Scopus

PubMed

Sheehan P.D., Tobin J.J., Li Z.Y., van ’t Hoff M.L.R., Jørgensen J.K., Kwon W., Looney L.W., Ohashi N., Takakuwa S., Williams J.P., Aso Y., Gavino S., Gregorio-Monsalvo I.d., Han I., Lee C.W., Plunkett A., Sharma R., Aikawa Y., Lai S.P., Lee J.E., Lin Z.Y.D., Saigo K., Tomida K., Yen H.W. . A VLA View of the Flared, Asymmetric Disk around the Class 0 Protostar L1527 IRS . Astrophysical Journal934 ( 2 ) 2022年8月査読国際共著

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

We present high-resolution Karl G. Jansky Very Large Array (VLA) observations of the protostar L1527 IRS at 7 mm, 1.3 cm, and 2 cm wavelengths. We detect the edge-on dust disk at all three wavelengths and find that it is asymmetric, with the southern side of the disk brighter than the northern side. We confirm this asymmetry through analytic modeling and also find that the disk is flared at 7 mm. We test the data against models including gap features in the intensity profile, and though we cannot rule such models out, they do not provide a statistically significant improvement in the quality of fit to the data. From these fits, we can, however, place constraints on allowed properties of any gaps that could be present in the true, underlying intensity profile. The physical nature of the asymmetry is difficult to associate with physical features owing to the edge-on nature of the disk, but it could be related to spiral arms or asymmetries seen in other imaging of more face-on disks.

DOI： 10.3847/1538-4357/ac7a3b

Scopus

Taniguchi K., Tanaka K.E.I., Zhang Y., Fedriani R., Tan J.C., Takakuwa S., Nakamura F., Saito M., Majumdar L., Herbst E. . Vibrationally Excited Lines of HC<inf>3</inf>N Associated with the Molecular Disk around the G24.78+0.08 A1 Hypercompact H ii Region . Astrophysical Journal931 ( 2 ) 99 - 99 2022年6月査読国際共著

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

We have analyzed Atacama Large Millimeter/submillimeter Array Band 6 data of the hypercompact H ii region G24.78+0.08 A1 (G24 HC H ii) and report the detection of vibrationally excited lines of HC3N (v 7 = 2, J = 24-23). The spatial distribution and kinematics of a vibrationally excited line of HC3N (v 7 = 2, J = 24-23, l = 2e) are found to be similar to the CH3CN vibrationally excited line (v 8 = 1), which indicates that the HC3N emission is tracing the disk around the G24 HC H ii region previously identified by the CH3CN lines. We derive the 13CH3CN/HC13CCN abundance ratios around G24 and compare them to the CH3CN/HC3N abundance ratios in disks around Herbig Ae and T Tauri stars. The 13CH3CN/HC13CCN ratios around G24 (∼3.0-3.5) are higher than the CH3CN/HC3N ratios in the other disks (∼0.03-0.11) by more than 1 order of magnitude. The higher CH3CN/HC3N ratios around G24 suggest that the thermal desorption of CH3CN in the hot dense gas and efficient destruction of HC3N in the region irradiated by the strong UV radiation are occurring. Our results indicate that the vibrationally excited HC3N lines can be used as a disk tracer of massive protostars at the HC H ii region stage, and the combination of these nitrile species will provide information of not only chemistry but also physical conditions of the disk structures.

DOI： 10.3847/1538-4357/ac69d1

Scopus

その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ac69d1/pdf

Chiong C.C., Nakamura F., Nishimura A., Burns R.A., Chien C., Dobashi K., Fujii Y., Ho C.T., Huang T., Hwang Y.J., Jian S.T., Kawabe R., Kimura K., Liu S.Y., Lai S.P., Ogawa H., Okada N., Kameno S., Shimoikura T., Takakuwa S., Taniguchi K., Wang W.H., Yeh Y.T., Yamasaki Y., Yonekura Y. . Extended Q-band (eQ) receiver for Nobeyama 45-m Telescope . Proceedings of SPIE - The International Society for Optical Engineering12190 2022年査読国際共著

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering

The Ka-/Q-band in the microwave region of the electromagnetic spectrum is important for astrophysical and astrochemical research, particularly in the subfield of interstellar medium (ISM). The two bands cover not only the fundamental lines of the abundant dense gas tracer CS and its isotopologues but also a vast number of transitions of relatively large, long-chain, and/or complex organic species. Here, through a Taiwan-Japan collaboration, an extended Q-band (30-50GHz) receiver is built for Nobeyama 45-m telescope. The receiver front-end was installed at Nobeyama 45-m telescope in Nov. 2021 and obtained its first light in the same month. Commissioning and science verification (CSV) of the receiver was conducted in the first half of 2022. After commissioning, this receiver will be the only one in the world providing capability to cover 3 Zeeman transitions simultaneously at 7mm wavelength installed at large single dish telescope. It will be one of the most powerful facilities to explore the magnetic fields towards the pre-protostellar cores.

DOI： 10.1117/12.2629811

Scopus

Taniguchi K. . Chemical Compositions in the Vicinity of Protostars in Ophiuchus . Astrophysical Journal922 ( 2 ) 152 - 152 2021年12月査読国際共著

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

We have analyzed Atacama Large Millimeter/submillimeter Array Cycle 4 Band 6 data toward two young stellar objects (YSOs), Oph-emb5 and Oph-emb9, in the Ophiuchus star-forming region. The YSO Oph-emb5 is located in a relatively quiescent region, whereas Oph-emb9 is irradiated by a nearby bright Herbig Be star. Molecular lines from cyclic-C3H2 (c-C3H2), H2CO, CH3OH, 13CO, C18O, and DCO+ have been detected from both sources, while DCN is detected only in Oph-emb9. Around Oph-emb5, c-C3H2 is enhanced at the west side, relative to the IR source, whereas H2CO and CH3OH are abundant at the east side. In the field of Oph-emb9, moment 0 maps of the c-C3H2 lines show a peak at the eastern edge of the field of view, which is irradiated by the Herbig Be star. Moment 0 maps of CH3OH and H2CO show peaks farther from the bright star. We derive the N(c-C3H2)/N(CH3OH) column density ratios at the peak positions of c-C3H2 and CH3OH near each YSO, which are identified based on their moment 0 maps. The N(c-C3H2)/N(CH3OH) ratio at the c-C3H2 peak is significantly higher than at the CH3OH peak by a factor of ∼19 in Oph-emb9, while the difference in this column density ratio between these two positions is a factor of ∼2.6 in Oph-emb5. These differences are attributed to the efficiency of the photon-dominated region chemistry in Oph-emb9. The higher DCO+ column density and the detection of DCN in Oph-emb9 are also discussed in the context of UV irradiation flux.

DOI： 10.3847/1538-4357/ac214e

Scopus

その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/ac214e/pdf

Ichikawa T. . Misaligned circumstellar disks and orbital motion of the young binary xz tau . Astrophysical Journal919 ( 1 ) 2021年9月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

We report our analyses of the multi-epoch (2015-2017) Atacama Large Millimeter/submillimeter Array (ALMA) archival data of the Class II binary system XZ Tau at Bands 3, 4, and 6. The millimeter dust-continuum images show compact, unresolved (r 15 au) circumstellar disks (CSDs) around the individual binary stars, XZ Tau A and B, with a projected separation of ∼39 au. The 12CO (2-1) emission associated with those CSDs traces the Keplerian rotations, whose rotational axes are misaligned with each other (P.A. ∼-5° for XZ Tau A and ∼130° for XZ Tau B). The similar systemic velocities of the two CSDs (VLSR ∼ 6.0 km s-1) suggest that the orbital plane of the binary stars is close to the plane of the sky. From the multi-epoch ALMA data, we have also identified the relative orbital motion of the binary. Along with the previous NIR data, we found that the elliptical orbit (e = - 0.742+0.034 0.025, = a 0. 172+0. 003 0. 002, and w = -54 .2+ 4 .7 2.0) is preferable to the circular orbit. Our results suggest that the two CSDs and the orbital plane of the XZ Tau system are all misaligned with each other, and possible mechanisms to produce such a configuration are discussed. Our analyses of the multi-epoch ALMA archival data demonstrate the feasibility of time-domain science with ALMA.

DOI： 10.3847/1538-4357/ac0dc3

Scopus

Hara C. . Misaligned twin molecular outflows from the class 0 protostellar binary system VLA 1623A unveiled by ALMA . Astrophysical Journal912 ( 1 ) 34 - 34 2021年5月査読国際共著

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

We present the results of ALMA observations toward the low-mass Class 0 binary system VLA 1623Aab in the Ophiuchus molecular cloud in 12CO, 13CO, and C18O(2–1) lines. Our 12CO (J = 2–1) data reveal that the VLA 1623 outflow consists of twin spatially overlapped outflows/jets. The redshifted northwestern jet exhibits three cycles of wiggle with a spatial period of 1360 ± 10 au, corresponding to a time period of 180 yr. The wiggle-like structure is also found in the position–velocity (PV) diagram, showing an amplitude in the velocity of about 0.9 km s−1. Both the period and velocity amplitude of the wiggle are roughly consistent with those expected from the binary parameters, i.e., the orbital period (460 ± 20 yr) and the Keplerian velocity (2.2 km s−1). Our 13CO and C18O images show a dense gas nature in the two centimeter/millimeter sources, VLA 1623B and W, and its relation to the outflows, and strongly support the previous interpretation that both are shocked cloudlets. The driving sources of the twin molecular outflows are, therefore, likely to be the VLA 1623Aab binary. The outflow axes of the two molecular outflows are estimated to be inclined by 70° to each other across the plane of sky, implying that protostellar disks are also misaligned by 70◦. Such nature together with a small binary separation of 34 au in one of the youngest protobinary systems seems difficult to explain by disk fragmentation in quiescent environments. Other effects such as turbulence probably play roles.

DOI： 10.3847/1538-4357/abb810

Scopus

その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/abb810/pdf

Taniguchi K. . Carbon-chain Chemistry versus Complex-organic-molecule Chemistry in Envelopes around Three Low-mass Young Stellar Objects in the Perseus Region . Astrophysical Journal910 ( 2 ) 141 - 141 2021年4月査読国際共著

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astrophysical Journal

We have analyzed ALMA Cycle 5 data in Band 4 toward three low-mass young stellar objects, IRAS 03235+3004 (hereafter IRAS 03235), IRAS 03245+3002 (IRAS 03245), and IRAS 03271+3013 (IRAS 03271), in the Perseus region. The HC3N (J = 16-15; E up/k = 59.4 K) line has been detected in all of the target sources, while four CH3OH lines (E up/k = 15.4-36.3 K) have been detected only in IRAS 03245. Sizes of the HC3N distributions (∼2930-3230 au) in IRAS 03235 and IRAS 03245 are similar to those of the carbon-chain species in the warm carbon-chain chemistry (WCCC) source L1527. The size of the CH3OH emission in IRAS 03245 is ∼1760 au, which is slightly smaller than that of HC3N in this source. We compare the CH3OH/HC3N abundance ratios observed in these sources with predictions of chemical models. We confirm that the observed ratio in IRAS 03245 agrees with the modeled values at temperatures around 30-35 K, which supports the HC3N formation by the WCCC mechanism. In this temperature range, CH3OH does not thermally desorb from dust grains. Nonthermal desorption mechanisms or gas-phase formation of CH3OH seem to work efficiently around IRAS 03245. The fact that IRAS 03245 has the highest bolometric luminosity among the target sources seems to support these mechanisms, in particular the nonthermal desorption mechanisms.

DOI： 10.3847/1538-4357/abe854

Scopus

その他リンク： https://iopscience.iop.org/article/10.3847/1538-4357/abe854/pdf

Shigehisa Takakuwa, Kazuya Saigo, Tomoaki Matsumoto, Masao Saito, Jeremy Lim, Hsi-Wei Yen, Nagayoshi Ohashi, Paul T. P. Ho, Leslie W. Looney . Circumbinary Disks of the Protostellar Binary Systems in the L1551 Region . The Astrophysical Journal898 ( 1 ) 10 2020年7月査読

Hsi-Wei Yen, Bo Zhao, Patrick M. Koch, Ruben Krasnopolsky, Zhi-Yun Li, Nagayoshi Ohashi, Hsien Shang, Shigehisa Takakuwa, Ya-Wen Tang . Transition from Ordered Pinched to Warped Magnetic Field on a 100 au Scale in the Class 0 Protostar B335 . The Astrophysical Journal893 ( 54 ) 2020年4月査読

Jinshi Sai, Nagayoshi Ohashi, Kazuya Saigo, Tomoaki Matsumoto, Yusuke Aso, Shigehisa Takakuwa, Yuri Aikawa, Ippei Kurose, Hsi-Wei Yen, Kohji Tomisaka, Kengo Tomida, Masahiro N. Machida . Disk Structure around the Class I Protostar L1489 IRS Revealed by ALMA: A Warped-disk System . The Astrophysical Journal893 ( 51 ) 2020年4月査読

Tetsu Kitayama, Shutaro Ueda, Takuya Akahori, Eiichiro Komatsu, Ryohei Kawabe, Kotaro Kohno, Shigehisa Takakuwa, Motokazu Takizawa, Takahiro Tsutsumi, Kohji Yoshikawa . Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev-Zel'dovich effect . Publications of the Astronomical Society of Japan72 ( 2 ) 33 - 3318 2020年4月査読

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astronomical Society of Japan

We present measurements of the thermal Sunyaev-Zel'dovich effect (SZE) toward SPT-CL J2334-4243 (the Phoenix galaxy cluster) at z = 0.597 by the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 3. The SZE is imaged at 5″ resolution (corresponding to the physical scale of 23 h-1 kpc) within 200 h-1kpc from the central galaxy, with the peak signal-to-noise ratio exceeding 11. Combined with the Chandra X-ray image, the ALMA SZE data further allow for non-parametric deprojection of electron temperature, density, and entropy. Our method can minimize contamination by the central active galactic nucleus and the X-ray absorbing gas within the cluster, both of which greatly affect the X-ray spectrum.We find no significant asymmetry or disturbance in the SZE image within the current measurement errors. The detected SZE signal shows much higher central concentration than other distant galaxy clusters and agrees well with the average pressure profile of local cool-core clusters. Unlike in typical clusters at any redshift, the gas temperature drops by at least a factor of 5 toward the center.We identify ~6 × 1011M⊙cool gas with temperature ~3 keV in the inner 20 h-1kpc. Taken together, our results imply that the gas is indeed cooling efficiently and nearly isobarically down to this radius in the Phoenix cluster.

DOI： 10.1093/pasj/psaa009

Scopus

arXiv

Yusuke Aso, Naomi Hirano, Yuri Aikawa, Masahiro N. Machida, Nagayoshi Ohashi, Masao Saito, Shigehisa Takakuwa, Hsi-Wei Yen, Jonathan P. Williams . Protostellar Evolution in Serpens Main: Possible Origin of Disk-size Diversity . The Astrophysical Journal887 ( 209 ) 14pp 2019年12月査読

Yu-Nung Su, Sheng-Yuan Liu, Zhi-Yun Li, Chin-Fei Lee, Naomi Hirano, Shigehisa Takakuwa, I.-Ta Hsieh . The Infall Motion in the Low-mass Protostellar Binary NGC 1333 IRAS 4A1/4A2 . The Astrophysical Journal885 ( 98 ) 16pp 2019年11月査読

Hsi-Wei Yen, Pin-Gao Gu, Naomi Hirano, Patrick M. Koch, Chin-Fei Lee, Hauyu Baobab Liu, Shigehisa Takakuwa . HL Tau Disk in HCO+ (3-2) and (1-0) with ALMA: Gas Density, Temperature, Gap, and One-arm Spiral . The Astrophysical Journal880 ( 69 ) 18pp 2019年8月査読

Kazuhito Motogi, Tomoya Hirota, Masahiro N. Machida, Yoshinori Yonekura, Mareki Honma, Shigehisa Takakuwa, Satoki Matsushita . The First Bird’s-eye View of a Gravitationally Unstable Accretion Disk in High-mass Star Formation . Astrophysical Journal Letters877 ( L25 ) 8pp 2019年6月査読

M. Yamagishi, C. Hara, R. Kawabe, F. Nakamura, T. Kamazaki, T. Takekoshi, Y. Shimajiri, H. Nomura, S. Takakuwa, and J. Di Francesco . ALMA Observations of Layered Structures due to CO Selective Dissociation in the rho Ophiuchi A Plane-parallel PDR . The Astrophysical Journal875 ( 1 ) 62 - 62 2019年4月査読

Hsi-Wei Yen, Shigehisa Takakuwa, Pin-Gao Gu, Naomi Hirano, Chin-Fei Lee, Hauyu Baobab Liu, Sheng-Yuan Liu, and Chun-Ju Wu . Signs of outflow feedback from a nearby young stellar object on the protostellar envelope around HL Tauri . Astronomy and Astrophysics623 ( A96 ) 2019年3月査読

Hsi-Wen Yen, Bo Zhao, I.-Ta Hsieh, Patrick Koch, Ruben Krasnopolsky, Chin-Fei Lee, Zhi-Yun Li, Sheng-Yuan Liu, Nagayoshi Ohashi, Shigehisa Takakuwa, and Ya-Wen Tang . JCMT POL-2 and ALMA Polarimetric Observations of 6000-100 au Scales in the Protostar B335: Linking Magnetic Field and Gas Kinematics in Observations and MHD Simulations . The Astrophysical Journal871 ( 2 ) 243 - 243 2019年2月査読

Dipen Sahu, Sheng-Yuan Liu, Yu-Nung Su, Zhi-Yun Li, Chin-Fei Lee, Naomi Hirano, and Shigehisa Takakuwa . Implications of a Hot Atmosphere/Corino from ALMA Observations toward NGC 1333 IRAS 4A1 . The Astrophysical Journal872 ( 2 ) 196 - 196 2019年2月査読

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