Updated on 2026/02/13

写真a

 
IMAI Hiroshi
 
Organization
Research Field in General Educathion, Integrated Arts and Sciences Area Center for General Education, Institute for Comprehensive Education First-Year and Liberal Arts Educathion Section Professor
Title
Professor
Degree
(1999.3 Tohoku University)
(1996.3 Tohoku University)
(1994.3 Tohoku University)

Research Interests

  • pulsating stars

  • VLBI

  • cosmic masers

  • radio astronomy

  • star formation

  • the Milky Way Galaxy

  • cosmic masers

  • 超長基線電波干渉法

  • 星形成

  • 恒星進化

  • 宇宙メーザー

  • very long baseline interferometry

  • stellar evolution

  • star formation

Research Areas

星間物理学, Astronomy, 恒星物理学, Astronomy

Education

  • 1996.4 - 1999.3    Tohoku University   Graduate School of Science   Astronomical Institute

  • - 1999    Tohoku University

  • - 1999    Tohoku University   Graduate School of Science   Astronomy

  • 1994.4 - 1996.3    Tohoku University   Graduate School of Science   Astronomical Institute

  • 1990.4 - 1994.3    Tohoku University   Faculty of Science   Astronomical Institute

  • - 1994    Tohoku University   Faculty of Science   Astronomical Institute

  • - 1994    Tohoku University   Faculty of Science

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Research History

  • 2023.10    Kagoshima University   Research Field in General Educathion, Integrated Arts and Sciences Area Center for General Education, Institute for Comprehensive Education First-Year and Liberal Arts Educathion Section   Professor

  • 2023.10    Kagoshima University   Research Field in General Educathion, Integrated Arts and Sciences Area Center for General Education, Institute for Comprehensive Education First-Year and Liberal Arts Educathion Section   Professor

  • 2018.4 - 2023.9    Kagoshima University   Research Field in General Educathion, Integrated Arts and Sciences Area Center for General Education, Institute for Comprehensive Education First-Year and Liberal Arts Educathion Section   Associate Professor

  • 2018.4 - 2023.9    Kagoshima University   Research Field in General Educathion, Integrated Arts and Sciences Area Center for General Education, Institute for Comprehensive Education First-Year and Liberal Arts Educathion Section   Associate Professor

  • 2017.6 - 2017.7    Square Kilometre Array Organization   Science Team   Visiting Researcher

  • 2016.1 - 2016.3    Square Kilometre Array Organization   Science Team   Visiting Researcher

  • 2013.4 - 2015.3    National Astronomical Observatory of Japan   Mizusawa VLBI Observatory   Visiting Associate Professor

  • 2012.2 - 2013.1    International Centre for Radio Astronomy Research   Visiting Associate Professor

  • 2011.4 - 2012.3    National Astronomical Observatory of Japan   Mizusawa VLBI Observatory   Visiting Associate Professor

  • 2010.4 - 2011.3    National Astronomical Observatory of Japan   Space VLBI Promotion Office   Visiting Associate Professor

  • 2009    - Associate Professor,

  • 2009    - 鹿児島大学 大学院理工学研究科 准教授

  • 2008.3 - 2018.3    Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Physics and Astronomy Course   Associate Professor

  • 2003.9 - 2008.2    Kagoshima University   Research Field in Science, Science and Engineering Area Graduate School of Science and Engineering (Science) Physics and Astronomy Course   Assistant Professor

  • 2002.4 - 2003.8    Joint Institute for VLBI in Europe   Support Scientist

  •    Long Baseline Interferometry in Europe

  •    Graduate School of Science, and Engineering,

  •    Japan Society of the Promotion of Science

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Professional Memberships

  • 2000.8    国際天文学連合

  • 2023.5    International Union of Radio Science (URSI)

  • 1994.4    日本天文学会

  • 2003.10    Japan Scientist Association

  • 1996.4    Japan Radio Astronomy Forum

  • 1994.4    Japan VLBI Consortinum

  •    Japan Scientists' Association

  •    International Astronomical Union

  •    日本科学者会議

  •    日本天文学会

  •    国際天文学連合

  •    Astronomical Society of Japan

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Committee Memberships

  • 2024.9 - 2026.8    National Astronomical Observatory of Japan VLBI Science Advisory Comittee   chair   Other

  • 2021.9 - 2023.5    International Astronomical Union Symposium 380 Organizing Committee   Local Organization Committee co-Chair   Other

  • 2020.4 - 2022.3    Japan Radio Astronomy Forum   Secretary General   Academic society

  • 2020.4 - 2024.3      Representative   Other

  • 2018.8 - 2024.8    国立天文台VLBI科学諮問委員会   委員   Other

  • 2018.8 - 2024.8    National Astronomical Observatory of Japan   VLBI Science Advisory Committee   Government

  • 2018.8 - 2020.7    国立天文台ALMA科学諮問委員会   委員   Other

  • 2018.8 - 2020.7    国立天文台VLBI科学諮問委員会VLBIプログラム小委員会   委員長   Other

  • 2018.8 - 2020.7    国立天文台電波天文周波数委員会   委員   Other

  • 2018.1 - 2025.12    Japan VLBI Consortinum   Officer   Academic society

  • 2016.8 - 2018.7      Officer of VLBI Advisory Committee   Academic society

  • 2016.8 - 2018.7    NAOJ VLBI Time Allocation Committee   Committee Chair   Other

  • 2014.8 - 2018.7    NAOJ ALMA Science Advisory Committee   Officer   Other

  • 2014.8 - 2016.7      Officer   Other

  • 2010.7 - 2012.6      Officer   Other

  • 2009.5 - 2012.12      Officer   Other

  • 2008.7 - 2016.7    NAOJ VLBI Time Allocation Committee   Officer   Other

  • 2006.5 - 2007.3    International Astronomical Union Symposium 242 Organization Committee   Science Organization Committee Member   Academic society

  • 2006.1 - 2009.12    Japan VLBI Consortinum   officer   Academic society

  • 2004.8 - 2018.7    NAOJ Radio Astronomy Frequncy Management Committee   Officer   Other

  • 2004.4 - 2011.9    Japan Radio Astronomy Forum   Management Officer   Academic society

  •       National Astronomical Observatory of Japan  

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Teacher organization examination execution

  • 2024.9   Kagoshima University   Integrated Arts and Sciences Area, Research Field in General Education   Professor

 

Papers

  • Imai H., Hoshino T., Tafoya D., Gómez J.F., Nakashima J.I., Orosz G. .  SiO v = 1 J = 5 → 4 Maser Emission from the Root of the “Water Fountain” Source W 43A .  Astrophysical Journal987 ( 2 )   2025.7

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    Authorship：Lead author   Language：Japanese   Publisher：Astrophysical Journal  

    We report here the first mapping of SiO v = 1 J = 5 → 4 maser emission toward the “water fountain” source W 43A in order to explore the central stellar system driving the collimated, bipolar, fast jet. The maser source has a systemic line-of-sight velocity consistent with that of CO J = 2 → 1 emission tracing the jet within ∼2 km s<sup>−1</sup> but a velocity gradient opposite that of the jet. The dynamical center of the maser source is located within ∼10 mas (or ∼20 au) of the brightness peak of the central 1.3 mm continuum emission. The spatiokinematic properties of the SiO J = 5 → 4 and J = 1 → 0 masers suggest that they are associated with the root of a slow (10 km s<sup>−1</sup> < V<inf>outflow</inf> << 100 km s<sup>−1</sup>) outflow with a large opening angle, and the central stellar system is contained within the inner maser region (∼20 au) during a possible common-envelope evolution.

    DOI： 10.3847/1538-4357/adde4e

    Scopus

  • Oyama T., Nagayama T., Yamauchi A., Sakai D., Imai H., Honma M., Asakura Y., Hada K., Hagiwara Y., Hirota T., Jike T., Kono Y., Suzuki S., Kobayashi H., Kawaguchi N. .  Trigonometric parallax and proper motion of Sagittarius A∗ measured by VERA using the new broad-band back-end system OCTAVE-DAS .  Publications of the Astronomical Society of Japan76 ( 2 ) 163 - 174   2024.4Reviewed

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

    We successfully measured the trigonometric parallax of Sagittarius A∗ (Sgr A∗) to be 117 ± 17 micro-Arcseconds () using the VLBI Exploration of Radio Astrometry (VERA) with the newly developed broad-band signal-processing system named "OCTAVE-DAS."The measured parallax corresponds to a Galactocentric distance at the Sun of kpc. By combining the astrometric results with VERA and the Very Long Baseline Array (VLBA) over a monitoring period of 25 yr, the proper motion of Sgr A∗ is obtained to be (μα, μδ) = (-3.133 ± 0.003,-5.575 ± 0.005) mas yr-1 in equatorial coordinates, corresponding to (μl, μb) = (-6.391 ± 0.005,-0.230 ± 0.004) mas yr-1 in Galactic coordinates. This gives an angular orbital velocity of the Sun of = 30.30 ± 0.02 km s-1 kpc-1. We find upper limits to the core wander, Δθ < 0.20 mas (1.6 au), peculiar motion, Δμ < 0.10 mas yr-1 (3.7 km s-1), and acceleration, a < 2.6 yr-2 (0.10 km s-1 yr-1) for Sgr A∗. Thus, we obtained upper mass limits of and for the supposed intermediate-mass black holes at 0.1 and 0.01 pc from the Galactic center, respectively.

    DOI： 10.1093/pasj/psad088

    Scopus

  • Khouri, T., Vlemmings, W. H. T., Tafoya, D., Pérez-Sánchez, A. F., Sánchez Contreras, C., Gómez, J. F., Imai. H., Sahai, R. .  Observational identification of a sample of likely recent Common-Envelope Events .  Nature Astronomy6   275 - 286   2021.12Reviewed International coauthorship

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

    DOI： 10.1038/s41550-021-01528-4

  • Tafoya, Daniel, Imai, Hiroshi, Gómez, José F., Nakashima, Jun-ichi, Orosz, Gabor, Yung, Bosco H. K. .  Shaping the Envelope of the Asymptotic Giant Branch Star W43A with a Collimated Fast Jet .  The Astrophysical Journal Letters890 ( 1 ) L14   2020.2Reviewed International coauthorship

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

    DOI： 10.3847/2041-8213/ab70b8

  • McDonald I., Srinivasan S., Scicluna P., Jones O.C., Zijlstra A.A., Wallström S.H.J., Danilovich T., He J.H., Marshall J.P., Loon J.T.v., Wesson R., Kemper F., Trejo-Cruz A., Greaves J., Dharmawardena T., Cami J., Kim H., Kraemer K.E., Clark C.J.R., Shinnaga H., Haswell C., Imai H., Wouterloot J.G.A., Vidal A.J.P., Rau G. .  The Nearby Evolved Stars Survey (NESS) V: properties of volume-limited samples of Galactic evolved stars .  Monthly Notices of the Royal Astronomical Society541 ( 1 ) 516 - 552   2025.7

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    Language：Japanese   Publisher：Monthly Notices of the Royal Astronomical Society  

    We provide a meta-study of the statistical and individual properties of two volume-complete sets of evolved stars in the solar neighbourhood: (1) 852 stars from the Nearby Evolved Stars Survey (NESS), and (2) a partially overlapping set of 507 evolved stars within 300 pc. We also investigate distance determinations to these stars, their luminosity functions and their spatial distribution. Gaia APSIS GSP-PHOT AENEAS temperatures of bright giant stars often appear to be underestimated. Existing literature on asymptotic giant branch (AGB) stars undersamples both the most and least extreme nearby dust-producing stars. We reproduce the literature star formation history of the solar neighbourhood, though stellar-evolution models overpredict the number of AGB stars of ages around 500 Myr. The distribution of AGB stars broadly matches the known 300 pc scale height of the Galactic disc and shows concentration in the direction of the Galactic centre. Most dust-producing carbon stars belong to the Galactic thick-disc population.

    DOI： 10.1093/mnras/staf978

    Scopus

  • Shinnaga H., Oyadomari M., Imai H., Oyama T., Claussen M.J., Shimojo M., Yamamoto S., Richards A.M.S., Etoka S., Gray M., Suzuki T. .  First VLBI imaging of SiO v = 0, J = 1→0 masers in VY Canis Majoris .  Publications of the Astronomical Society of Japan77 ( 3 ) 459 - 465   2025.6

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

    We have achieved the first VLBI detections of the ground vibrational state (v = 0) <sup>28</sup>SiO (hereafter, SiO) and <sup>29</sup>SiO masers of the J = 1→0 rotational transitions, towards the 25 red supergiant (RSG) star, VY Canis Majoris (VY CMa), taking advantage of the high sensitivity of the VLBI Exploration of Radio Astrometry (VERA) telescopes that coordinate with the Nobeyama 45 m telescope. In addition, we successfully detected the SiO J = 1→0 transition in the v = 3) state towards VY CMa for the first time with VLBI. The SiO J = 1→0 maser spot in the v = 0 state was detected in the cross-power spectra taken with the baselines involving the Nobeyama 45 m telescope. The combination of previously reported absolute astrometry and the relative astrometry technique allowed us to derive the location of the SiO v = 0 maser spot, (RA, Dec) = (,) in J2000.0 at an absolute positional accuracy of 100 milliarcseconds (mas). The SiO v = 0 maser spot is offset by the amount of (RA, Dec) = (-150, -300) (mas) to the south-west of the stellar position, suggesting that the v = 0) maser spot is associated with its outflow activity. This observational study demonstrates that the brightest SiO v = 0 maser spot is compact (3 mas), producing an extremely high brightness of K. This indicates that the SiO v = 0 maser action may originate from strong shocks in the stellar wind emanating from this extreme RSG that leads to its intense mass ejection.

    DOI： 10.1093/pasj/psaf013

    Scopus

  • Khouri T., Tafoya D., Vlemmings W.H.T., Olofsson H., Contreras C.S., Alcolea J., Gómez J.F., Velilla-Prieto L., Sahai R., Santander-García M., Bujarrabal V., Karakas A., Saberi M., Cava I.G., Imai H., Pérez-Sánchez A.F. .  ALMA observations of CO isotopologues towards six obscured post-asymptotic giant branch stars .  Astronomy and Astrophysics694   2025.2

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    Language：Japanese   Publisher：Astronomy and Astrophysics  

    Context. Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB) when an efficient mass-loss process removes a significant fraction of their initial mass. For most sources, this mass-loss process relies on the interplay between convection, stellar pulsations, and dust formation. However, predicting the mass-loss history of a given star from first principles is complex and not yet feasible at present. At the end of the AGB, at least some stars experience a substantial increase in their mass-loss rate for unknown reasons, leading to the creation of post-AGB objects that are completely enshrouded in thick dusty envelopes. Recent studies have suggested that some of these sources may be the product of interactions between an evolved star with a close companion. Aims. We observed six obscured post-AGB stars (four C-rich and two O-rich sources) to constrain the properties of their circumstellar envelopes, recent mass-loss histories, and initial masses of the central stars. Methods. We used observations of the J = 2−1 line of 13CO, C17O, and C18O with the Atacama Large Millimeter/submillimeter Array (ALMA) to determine the circumstellar gas masses and the 17O/18O isotopic ratios, the latter of which can be used to infer initial stellar masses. These results were interpreted in the context of comparisons with stellar evolution models in the literature and existing observations of other post-AGB stars. Results. Based on the inferred 17O/18O isotopic ratios, we find all stars to have relatively low initial masses (<2 M ), contrary to literature indications of higher masses for some sources. One of the C-rich sources, HD 187885, has a low 17O/18O ratio; coupled with a low metallicity, this would imply a relatively low mass (∼1.15 M ) for a carbon star. For all but one source (GLMP 950), we observe kinematic components with velocities of &30 km s−1, which are higher than typical AGB wind expansion velocities. For most sources, these higher velocity outflows display point-symmetric morphologies. The case of Hen 3-1475 is especially spectacular, with the high-velocity molecular outflow appearing to be interleaved with the high-velocity outflow of ionised gas observed at optical wavelengths. Based on the size of the emission regions of the slow components of the outflows, we derived typical kinematic ages associated with the C18O J = 2−1 emission of .1500 years and obtained relatively high associated mass-loss rates (&10−4 M yr−1). The sources with known spectral types are found to have evolved faster than expected, compared to stellar evolutionary models.

    DOI： 10.1051/0004-6361/202452500

    Scopus

  • Cala R.A., Gómez J.F., Miranda L.F., Imai H., De Gregorio-Monsalvo I., Placinta Mitrea F., Osorio M., Anglada G. .  An interferometric search for SiO maser emission in planetary nebulae .  Astronomy and Astrophysics692   2024.12

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    Language：Japanese   Publisher：Astronomy and Astrophysics  

    Context. Maser emission of SiO, H2O, and OH is widespread in asymptotic giant branch (AGB) stars with oxygen- (O-) rich envelopes. This emission quickly disappears during the post-AGB phase and is extremely rare in planetary nebulae (PNe). So far, only eight PNe have been confirmed to show OH and/or H2O maser emission, and none have ever been found to show SiO maser emission. Aims. We intend to obtain the first detection of a SiO maser from a PN. Such a detection would provide us with a useful tool to probe mass loss in PNe at a scales of a few AU from the central star, much shorter than the scales traced by H2O or OH masers. Methods. We compiled two different samples. The first one comprises all known PNe with confirmed OH and/or H2O maser emission, as well as two candidate PNe showing OH masers. For the second sample, we compiled single-dish SiO maser detections in the literature, and compared them with catalogs of PNe and radio continuum emission (which could trace photoionized gas in PNe). We identified five targets (either PN or radio continuum sources) within the beam of the single-dish SiO maser observations. We then carried out interferometric observations of both samples with the Australia Telescope Compact Array, to confirm the spatial association between continuum and SiO maser emission. Results. We find no SiO maser emission associated with any confirmed or candidate PN. In all targets, except IRAS 17390-3014, there is no spatial coincidence between SiO masers and radio continuum emission. While in IRAS 17390-3014 we cannot completely rule out a possible association, it is unlikely that the radio continuum emission arises from a PN. Conclusions. The absence of SiO maser emission in PNe showing OH or H2O masers is of special interest, since thermal SiO emission has been reported in at least one of these targets, indicating that SiO molecules can be present in the gas phase. Since some maser-emitting PNe show evidence of having O-rich outer envelopes, and carbon- (C-) rich central stars and inner envelopes, we speculate that SiO abundance could be very low in the central regions where physical conditions are optimal for maser pumping, and C-bearing molecules may be dominant in the gas phase at those locations.

    DOI： 10.1051/0004-6361/202451717

    Scopus

  • Fan, Haichen; Nakashima, Jun-ichi; Engels, Dieter; Zhang, Yong Zhang, Qiu, Jian-Jie; Feng, Huan-Xue; Xie, Jia-Yong; Imai, Hiroshi; Hsia, Chih-Hao .  Systematic Search for Water Fountain Candidates using the Databases of Circumstellar Maser Sources .  Astrophysical Journal Supplement Series270 ( 1 ) 13   2024.1Reviewed International coauthorship

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

  • Imai Hiroshi .  Frontier of International Collaborative Researches .  Journal of Japanese Scientists59 ( 5 ) 41 - 43   2024

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    Language：Japanese   Publisher：The Japan Scientists' Association  

    DOI： 10.60233/jjsci.59.5_41

    CiNii Research

  • Nakashima J., Fan H., Engels D., Zhang Y., Qiu J.J., Feng H.X., Xie J.Y., Imai H., Hsia C.H. .  A Profile-based Approach to Finding New Water Fountain Candidates using Databases of Circumstellar Maser Sources .  Proceedings of the International Astronomical Union18   377 - 379   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    Water fountains (WFs) are thought to represent an early stage in the morphological evolution of circumstellar envelopes surrounding low- and intermediate-mass evolved stars. These objects are considered to transition from spherical to asymmetric shapes. Despite their potential importance in this transformation process of evolved stars, there are only a few known examples. To identify new WF candidates, we used databases of circumstellar OH (1612 MHz) and H2O (22.235 GHz) maser sources, and compared the velocity ranges of the two maser lines. Finally, 41 sources were found to have a velocity range for the H2O maser line that exceeded that of the OH maser line. Excluding known planetary nebulae and after reviewing the maser spectra in the original literature, we found for 11 sources the exceedance as significant, qualifying them as new WF candidates.

    DOI： 10.1017/S1743921323002065

    Scopus

  • Yun Y., Cho S.H., Yoon D.H., Yang H., Dodson R., Rioja M.J., Imai H. .  Results of KVN Key Science Program for evolved stars .  Proceedings of the International Astronomical Union18   324 - 327   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We present the results of KVN Key Science Program (KSP) for evolved stars, which was launched in 2014. The first phase of KSP ended in June 2020 and the second phase started in October 2020. The goal of KSP is to study the physical characteristics of the evolved stars by observing the spatial distribution and temporal variability of the stellar masers at four frequency-bands (K, Q, W and D bands). The 22 GHz H2O maser is usually observed from the outer part of circumstellar envelopes compared to the 43, 86, 129 GHz SiO masers, thus the kinematic links between these regions can be studied by the multi-frequency simultaneous observations of KSP along the stellar pulsation cycles. This eventually enable us to study the enormous mass-loss rate of evolved stars, and the accumulated results from KSP are expected to shed light on the study of the late stage of the stellar evolution.

    DOI： 10.1017/S174392132300217X

    Scopus

  • Chacón P., Uscanga L., Imai H., Yung B.H.K., Gómez J.F., Rizzo J.R., Suárez O., Miranda L.F., Anglada G., Torrelles J.M. .  Interferometric Observations of the Water Fountain Candidates OH 16.3-3.0 and IRAS 19356+0754 .  Proceedings of the International Astronomical Union18   362 - 364   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    Water Fountains (WFs), located between the AGB and PN phases of stellar evolution, may provide significant clues on the shaping process of PNe. We present new VLA observations of the WF candidates OH 16.3-3.0 and IRAS 19356+0754. We detect H2O and OH maser and radio continuum emission towards OH 16.3-3.0. We suggest that the OH maser emission of OH 16.3-3.0 is associated with an aspherical circumstellar envelope due to its spatio-kinematics and peculiar spectral profile. We could not confirm the candidates as bona fide WFs because of the narrow velocity spread (OH 16.3-3.0) or non-detection (IRAS 19356+0754) of H2O maser emission. Further monitoring could help to discern their nature.

    DOI： 10.1017/S1743921323002168

    Scopus

  • Nakashima K., Shum K.Y., Imai H. .  HINOTORI and Maser Observations .  Proceedings of the International Astronomical Union18   380 - 382   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    HINOTORI (Hybrid Integration Project in Nobeyama, Triple-band Oriented) has constructed a higher sensitivity 22/43 GHz and a 22/43/86 GHz simultaneous observation systems in the Nobeyama 45-m telescope by introducing new frequency separation filters in the telescope's quasi-optics. The performance of the observation systems, such as the beam squint, the aperture efficiency, the system noise temperature when inserting the filters, and the phase stability of the signal path have been evaluated. It is indicated that the established systems have sufficient performance for single-dish and VLBI observations. The single-dish observation demonstrations using the triple-band system were successfully conducted in acquiring scientific data including multiple maser lines.

    DOI： 10.1017/S1743921323002740

    Scopus

  • Honma M., Hirota T., Hachisuka K., Imai H., Kobayashi H., Jike T., Nakagawa A., Oyama T., Sunada K., Sakai D., Sakai N., Yamauchi A. .  Galactic maser astrometry with VERA .  Proceedings of the International Astronomical Union18   82 - 87   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    VERA has been regularly conducting astrometry of Galactic maser sources for ∼ 20 years, producing more than 100 measurements of parallaxes and proper motions of star-forming regions as well as AGB stars. By combining the observational results obtained by VLBA BeSSeL, EVN, and LBA, maser astrometry provides a unique opportunity to explore the fundamental structure of the Galaxy. Here we present the view of the Galaxy revealed by the maser astrometry, and also discuss the importance of maser astrometry in the era of GAIA by comparing the results obtained by VLBI and GAIA. We also present our view of “proper motions toward the future” of the relevant field, expected in the next decade based on global collaborations.

    DOI： 10.1017/S174392132300306X

    Scopus

  • Shakhvorostova N.N., Moran J.M., Alakoz A.V., Imai H., Gwinn C.R., Sobolev A.M. .  Fine structure and refractive scattering of the H<inf>2</inf>O maser in star-forming region W49N .  Proceedings of the International Astronomical Union18   238 - 239   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We used the unprecedented resolution of ∼25 μas of the VLBI array formed with the RadioAstron satellite to study the structures of H2O maser spots in the star forming region W49N. We found that anisotropic diffractive scattering of the ISM dominates the images of the maser spot, but does not completely blur them. The refractive scattering floor is about 0.001 in visibility at a baseline of 8 Gλ.

    DOI： 10.1017/S1743921323003460

    Scopus

  • Uscanga L., Imai H., Gómez J.F., Tafoya D., Orosz G., McCarthy T.P., Hamae Y., Amada K. .  Evolution of the outflow traced by water masers in the evolved star IRAS 18043 - 2116 .  Proceedings of the International Astronomical Union18   338 - 342   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We present the spectral and spatial evolution of H2O masers associated with IRAS 18043-2116, a well-known water fountain hosting a high-velocity collimated jet, which has been found in the observations with the 45 m telescope of Nobeyama Radio Observatory and the Australia Telescope Compact Array. We found new highest velocity components of the H2O masers, with which the resulting velocity spread of ≃ 540 km s-1 breaks the speed record of fast jets/outflows in this type of sources.

    DOI： 10.1017/S1743921323002156

    Scopus

  • Amada K., Imai H., Hamae Y., Nakashima K., Shum K.Y., Tafoya D., Uscanga L., Gómez J.F., Orosz G., Burns R.A. .  Discovery of SiO masers in the Water Fountain source, IRAS 16552-3050 .  Proceedings of the International Astronomical Union18   359 - 361   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We report new detections of SiO ν = 1 and ν = 2 J = 1 → 0 masers in the water fountain source IRAS 16552-3050, which was observed with the Nobeyama 45 m telescope from March 2021 to April 2023. Water fountains are evolved stars whose H2O maser spectra trace high-velocity outflows of >100 Km s-. This is the second known case of SiO masers in a water fountain, after their prototypical source, W 43A. The line-of-sight velocity of the SiO masers are blue-shifted by ∼25 km s-1 from the systemic velocity. This velocity offset imply that the SiO masers are associated with nozzle structure formed by a jet penetrating the circumstellar envelope, and that new gas blobs of the jet erupted recently. Thus, the SiO masers imply this star to be in a new evolutionary stage.

    DOI： 10.1017/S1743921323002739

    Scopus

  • Gómez J.F., Cala R.A., Miranda L.F., Imai H., Osorio M., Anglada G. .  A sensitive search for SiO maser emission in planetary nebulae .  Proceedings of the International Astronomical Union18   374 - 376   2023.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    Eight planetary nebulae (PNe) are known to emit OH and/or H2O masers, but there is no report of an SiO maser in this type of objects. We present a search for SiO masers in 16 confirmed and candidate PNe, carried out with the Australia Telescope Compact Array. We found no evidence of association between SiO masers and PNe in our data. Previous detections of thermal SiO emission in PNe show that these molecules can be present in gas phase in this type of objects, but it is not yet clear whether they can be found where the physical conditions are appropriate for maser pumping. We suggest that the best candidates for a new search would be PNe showing high-velocity outflows.

    DOI： 10.1017/S1743921323002247

    Scopus

  • Imai H., Hamae Y., Amada K., Nakashima K., Shum K.Y., Kasai R., Gómez J.F., Uscanga L., Tafoya D., Orosz G., Burns R.A. .  FLASHING: Project overview .  Publications of the Astronomical Society of Japan75 ( 6 ) 1183 - 1213   2023.12Reviewed

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    Authorship：Lead author   Language：Japanese   Publisher：Publications of the Astronomical Society of Japan  

    This paper describes an overview of the FLASHING (Finest Legacy Acquisitions of SiO-/H2O-maser Ignitions by the Nobeyama Generation) project promoted using the 45 m telescope of Nobeyama Radio Observatory, which aims to intensively monitor H2O (at 22 GHz) and SiO (at 43 GHz) masers associated with so-called "water fountain"sources. Here we show scientific results based on the data taken in the first five seasons of FLASHING, from 2018 December to 2023 April. We show the evolution of the H2O maser spectra, discovering new spectral components that break the record of the jet's top speed and/or systematic velocity drifts in the spectrum indicating acceleration or deceleration of the maser gas clumps. For the 43 GHz SiO maser emission, we newly detect it in one source and find that it is no longer present in another source. This implies that the jets from these water fountains can be accelerated or decelerated, and show how circumstellar envelopes are destroyed.

    DOI： 10.1093/pasj/psad064

    Scopus

  • Imai, Hiroshi; Niinuma, Kotaro; Ogawa, Hideo; Oyama, Tomoaki; Shimizu, Yusuke; Miyazawa, Chieko; Nishimura, Atsushi; Okada, Nozomi; Amada, Kei; Matsusaka, Ren; Nakashima, Keisuke; Shum, Ka-Yiu; Tsusumi, Toshihisa; Yoneyama, Sho; Sawada-Satoh, Satoko; Shinnaga, Hiroko; Yonekura, Yoshinori; Hirota, Tomoya; Kameno, Seiji .  HINOTORI and its perspective .  2023 XXXVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)   2023.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.23919/URSIGASS57860.2023.10265583

  • 今井 裕 .  最も解像度が高いVLBI .  日本の科学者58 ( 7 ) 33 - 38   2023.7

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    Language：Japanese   Publisher：日本科学者会議  

    DOI： 10.60233/jjsci.58.7_33

    CiNii Research

  • Uscanga, L.; Imai, H.; Gómez, J. F.; Tafoya, D.; Orosz, G.; McCarthy, T. P.; Hamae, Y.; Amada, K. .  Evolution of the outflow in the water fountain source IRAS 18043−2116 .  The Astrophysical Journal948   17(1) - 17(11)   2023.5Reviewed International coauthorship

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

    DOI： 10.3847/1538-4357/acc06f

  • Tsutsumi, Toshihisa; Niinuma, Kotaro; Imai Hiroshi; Amari, Ryoko; Shimizu, Yusuke Shimizu; Ogawa, Hideo; Nishimura, Atsushi; Miyazawa, Chieko; Oyama, Tomoaki; kaneko, Hiroyuki; Nakashima, Keisuke; Sawada-Satoh, Satoko; Aoki, Takahiro Aoki .  HINOTORI and Its Perspectives in the Black-Hole Jet Study .  Galaxies11   30   2023.2Reviewed

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

    DOI： 10.3390/galaxies11010030

  • Sakai, Nobuyuki;, Zhang, Bo; Xu, Shuangjing; Sakai, Daisuke; Tamura, Yoshiaki; Jike, Takaaki; Jung, Taehyun; Oh, Chungsik; Kim, Jeong-Sook; Kawaguchi, Noriyuki; Imai, Hiroshi; Jiang, Wu; Cui, Lang; Kim, Soon-Wook; JIANG, Pengfei, KURAYAMA, Tomoharu; Lee, Jeong Ae; Hachisuka, Kazuya; Jung, Dong-Kyu; Xia, Bo; Li, Guanghui; Honma Mareki; Kim, Kee-Tae; Shen, Zhi-Qiang; Wang, Na Wang .  EAVN Astrometry toward the Extreme Outer Galaxy: Kinematic distance with the proper motion of G034.84−00.95 .  Publications of the Astronomical Society of Japan75   208 - 224   2023.2Reviewed International coauthorship

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

    DOI： 10.1093/pasj/psac102

  • Imai, Hiroshi; Ogawa, Hideo; Niinuma, Kotaro; Shimizu, Yusuke; Oyama, Tomoaki; Miyazawa, Chieko; Nishimura, Atsushi; Nosohara, Chiaki; Okada, Nozomi; Amada, Kei; Matsusaka, Ren; Nakashima, Keisuke; Shum, Ka-Yiu; Takahashi, Toshikazu; Tsutsumi, Toshihisa; Yoneyama, Sho; Sawada-Satoh, Satoko; Shinnaga, Hiroko; Yonekura, Yoshinori; Hirota, Tomoya; Kameno , Seiji .  Double-/triple-bands simultaneous observation system with perforated dichroic filter plates equipped for the Nobeyama 45 m radio telescope .  Proceedings of the 2022 Asian-Pacific Microwave Conference (APMC)   587 - 589   2023.1Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.23919/APMC55665.2022.9999827

  • Xu S., Imai H., Yun Y., Zhang B., Rioja M.J., Dodson R., Cho S.H., Kim J., Cui L., Sobolev A.M., Chibueze J.O., Kim D.J., Amada K., Nakashima J.I., Orosz G., Oyadomari M., Oh S., Yonekura Y., Sun Y., Mai X., Zhang J., Wen S., Jung T. .  The Astrometric Animation of Water Masers toward the Mira Variable BX Cam .  Proceedings of the International Astronomical Union18   328 - 332   2022.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We report VLBI monitoring observations of the 22 GHz H2O masers toward the Mira variable BX Cam. Data from 37 epochs spanning ∼3 stellar pulsation periods were obtained between May 2018 and June 2021 with a time interval of 3-4 weeks. In particular, the VERA dual-beam system was used to measure the kinematics and parallaxes of the H2O maser features. The obtained parallax, 1.79±0.08 mas, is consistent with Gaia EDR3 and previous VLBI measurements. The position of the central star was estimated relied on Gaia EDR3 data and the center position of the 43 GHz SiO maser ring imaged with KVN. Analysis of the 3D maser kinematics revealed an expanding circumstellar envelope with a velocity of 13±4 km s-1 and significant spatial and velocity asymmetries. The H2O maser animation achieved by our dense monitoring program manifests the propagation of shock waves in the circumstellar envelope of BX Cam.

    DOI： 10.1017/S1743921323002570

    Scopus

  • Imai H., Amada K., Gómez J.F., Uscanga L., Tafoya D., Nakashima K., Shum K.Y., Hamae Y., Burns R.A., Shibata Y., Kasai R., Takashima M., Orosz G. .  Water Fountain Sources Monitored in FLASHING .  Proceedings of the International Astronomical Union18   333 - 337   2022.12

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We have investigated the spectral evolutions of H2O and SiO masers associated with 12 water fountain sources in our FLASHING (Finest Legacy Acquisitions of SiO-/H2O-maser Ignitions by Nobeyama Generation) project. Our monitoring observations have been conducted using the Nobeyama 45 m telescope every 2 weeks-2 months since 2018 December except during summer seasons. We have found new extremely high velocity H2O maser components, breaking the records of jet speeds in this type of sources. Systematic line-of-sight velocity drifts of the H2O maser spectral peaks have also been found, indicating acceleration of the entrained material hosting the masers around the jet. Moreover, by comparing with previous spectral data, we can find decadal growths/decays of H2O maser emission. Possible periodic variations of the maser spectra are further being inspected in order to explore the periodicity of the central stellar system (a pulsating star or a binary). Thus we expect to see the real-time evolution/devolutions of the water fountains over decades.

    DOI： 10.1017/S1743921323001916

    Scopus

  • Xu, Shuangjing; Imai, Hiroshi; Yun, Youngjoo; Zhang, Bo; Rioja, Maria J.; Dodson, Richard; Cho, Se-Hyung; Kim, Jaeheon; Cui, Lang; Sobolev, Andrey M.; Chibueze, James O.; Kim, Dong-Jin; Amada, Kei; Nakashima, Jun-ichi; Orosz, Gabor; Oyadomari, Miyako; Oh, Sejin; Yonekura, Yoshinori; Sun, Yan; Mai, Xiaofeng; Zhang, Jingdong; Wen, Shiming; Jung, Taehyun .  The Astrometric Animation of Water Masers towards the Mira Variable BX Cam .  The Astrophysical Journal941   105   2022.12Reviewed International coauthorship

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

    DOI： 10.3847/1538-4357/ac9599

  • Akiyama, Kazunori; Algaba, Juan-Carlos; An, Tao; Asada, Keiichi; Asanok, Kitiyanee; Byun, Do-Young; Chanapote, Thanapol; Chen, Wen; Chen, Zhong; Cheng, Xiaopeng; Chibueze, James O.; Cho. Ilje; Cho, Se-Hyung; Chung, Hyun-Soo; Cui, Lang; Cui, Yuzhu; Doi, Akihiro; Dong, Jian; Fujisawa, Kenta; Gou, Wei; Guo, Wen; Hada, Kazuhiro; Hagiwara, Yoshiaki; Hirota, Tomoya; Hodgson, Jeffrey A.; Honma, Mareki; Imai, Hiroshi; Jaroenjittichai, Phrudth; Jiang, Wu; Jiang, Yongbin; Jiang, Yongchen; Jike, Takaaki; Jung, Dong-Kyu; Jung, Taehyun; Kawaguchi, Noriyuki; Kin, Dong-Jin; Kim, Hyo-Ryoung; Kim, Jaeheon; Kim, Jeong-Sook; Kim, Kee-Tae; Kim, Soon-Wook; Kino, Motoki; Kobayashi, Hideyuki; Koyama, Shoko; Kramer, Busaba H.; Lee, Jee-Won; Lee, Jeong Ae; Lee, Sang-Sung; Lee, Sang Won; Li, Bin; Li, Guanghui; Li, Xiaofei; Li, Zhixuan; Liu, Qinghui; Liu, Xiang; Lu, Ru-sen; Motogi, Kazuhito; Nakamura, Masanori; Niinuma, Kotaro; Oh, Chungsik; Oh, Hongjong; Oh, Junghwan; Oh, Se-Jin; Oyama, Tomoaki; Park, Jongho; Poshyachinda, Saran; Ro, Hyunwook; Roh, Duk-Hyoo; Rujopakarn, Wiphu; Sakai, Nobuyuki; Satoh-Sawada, Satoko; Shen, Zhi-Qiang; Shibata, Katsunori M.; Sohn, Bong Won; Soonthornthum, Boonrucksar; Sugiyama, Koichiro; Sun, Yunxia; Takamura, Mieko; Tanabe, Yoshihiro; Tazaki, Fumie; Trippe, Sascha; Wajima, Kiyoaki; Wang, Jinqing; Wang, Na; Wang, Shiqiang; Wang, Xuezheng; Xia, Bo; Xu, Shuangjing; Yan, Hao; Yang, Wenjun; Yeom, Jae-Hwan; Yi, Kunwoo; Yi, Sang-Oh; Yonekura, Yoshinori; Yoon, Hasu; Yu, Linfeng; Yuan, Jianping; Yun, Youngjoo; Zhang, Bo; Zhang, Hua; Zhang, Yingkang; Zhao, Guang-Yao; Zhao, Rongbing; Zhong, Weiye .  Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN) .  Galaxies10   113   2022.12Reviewed International coauthorship

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

    DOI： 10.3390/galaxies10060113

  • Cala, Roldán A.; Gómez, José F.; Miranda, Luis F.; Uscanga, Lucero; Breen, Shari L.; Dawson, Joanne R.; de Gregorio-Monsalvo, Itziar; Imai, Hiroshi; Qiao, Hai-Hua; Suárez, Olga .  Searching for nascent planetary nebulae: OHPNe candidates in the SPLASH survey .  Monthly Notices of the Royal Astronomical Society516   2235 - 2251   2022.10Reviewed International coauthorship

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

    DOI： 10.1093/mnras/stac2341

  • Dempsey, James; McClure-Griffiths, N. M.; Murray, Claire; Dickey, John M.; Pingel, Nickolas M.; Jameson, Katherine; Dénes, Helga; van Loon, Jacco Th.; Leahy, D.; Lee, Min-Young; Stanimirović, S.; Breen, Shari; Buckland-Willis, Frances; Gibson, Steven J.; Imai, Hiroshi; Lynn, Callum; Tremblay, C. D. .  GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud .  Publications of the Astronomical Society of Australia39   e34   2022.8Reviewed International coauthorship

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

    DOI： 10.1017/pasa.2022.18

  • Baan, Willem. A.; An, Tao,Henkel, Christian; Imai, Hiroshi; Kostenko, Vladimir; Sobolev, Andrej .  H2O MegaMaser emission in NGC 4258 indicative of a periodic disc instability .  Nature Astronomy6   976 - 983   2022.6Reviewed International coauthorship

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

    DOI： 10.1038/s41550-022-01706-y

  • Dawson, J. R.; Jones, P. A.; Purcell, C.; Walsh, A. J.; Breen, S. L.; Brown, C.; Carretti, E.; Cunningham, M. R.; Dickey, J. M.; Ellingsen, S. P.; Gibson, S. J.; Gómez, J. F.; Green, J. A.; Imai, H.; Krishnan, V.; Lo, N.; Lowe, V.; Marquarding, M.; McClure-Griffiths, N. M. .  SPLASH: the Southern Parkes Large-Area Survey in Hydroxyl - data description and release .  Monthly Notices of the Royal Astronomical Society512   3345 - 3364   2022.5Reviewed International coauthorship

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

    DOI： 10.1093/mnras/stac636

  • Scicluna, P., Kemper, F., McDonald, I., Srinivasan, S., Trejo, A., Wallström, S. H. J., Wouterloot, J. G. A., Cami, B. J., Greaves, J., He, J. Hoai, D. T., Kim, H., Jones, O. C., Shinnaga, H., Clark, C. J. R., Dharmawardena, T., Holland, W., Imai, H., van Loon, J. Th., Menten, K. M., Wesson, R., Chawner, H., Feng, S., Goldman, S., Liu, F. C., MacIsaac, H., Tang, J., Zeegers, S., Amada, K., Antoniou, V., Bemis, A., Boyer, M. L., Chapman, S., Chen, X., Cho, S.-H., Cui, L., Dell’Agli, F., Friberg, P., Fukaya, S., Gomez, H., Gong,Y., Haswell, C., Hirano, N., Hony, S., Izumiura, H., Jeste, M., Jiang, X., Kaminski, T., Keaveney, N., Kim, J., Kraemer, K. E., Kuan, Y.-J., Lagadec, E., Lee, C. F., Li, D., Liu, S.-Y., Liu, T., de Looze, I., Lykou, F., Maraston, C., Marshall, J. P., Matsuura, M., Min, C., Otsuka, M., Oyadomari, M., Parsons, H., Patel, N. A., Peeters, E., Pham, T. A., Qiu, J., Randall, S., Rau, G., Redman, M. P., Richards, A. M. S., Serjeant, S., Shi, C., Sloan, G. C., Smith, M. W. L., J. A., Uttenthaler, S., Ventura, P., Wang, B., Yamamura, I., Yang, T., Yun, Y., Zhang, F., Zhang, Y., Zhao, G., Zhu, M., Zijlstra, A. A. .  The Nearby Evolved Stars Survey II: Constructing a volume-limited sample and first results from the James Clerk Maxwell Telescope .  Monthly Notices of the Royal Astronomical Society512   1091 - 1110   2022.3Reviewed International coauthorship

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

    DOI： 10.1093/mnras/stab2860

  • Yamamoto, Hiroaki ; Okamoto, Ryuji ; Murata, Yasuhiro ; Nakanishi, Hiroyuki ; Imai, Hiroshi ; Kurahara, Kohei .  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 Japan   2022.3Reviewed

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

    DOI： 10.1093/pasj/psac012

  • Amada, Kei; Imai, Hiroshi; Hamae, Yuki;Nakashima, Keisuke; Shun, Ka Yiu; Tafoya, Daniel; Uscanga, Lucero; Gomez, Jose-Francisco; Orosz, Gabor; Burns, Ross A .  Discovery of SiO masers in the ``water fountain" source IRAS 16552-3050 .  Astronomical Journal163   85   2022.2Reviewed International coauthorship

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

    DOI： 10.3847/1538-3881/ac3fb6

  • Pingel, N. M.; Dempsey, J.; McClure-Griffiths, N. M.; Dickey, J. M.; Jameson, K. E.; Arce, H.; Anglada, G.; Bland-Hawthorn, J.; Breen, S. L.; Buckland-Willis, F.; Clark, S. E.; Dawson, J. R.; Dénes, H.; Di Teodoro, E. M.; For, B. -Q.; Foster, Tyler J.; Gómez, J. F.; Imai, H.; Joncas, G.; Kim, C. -G.; Lee, M. -Y.; Lynn, C.; Leahy, D.; Ma, Y. K.; Marchal, A.; McConnell, D.; Miville-Deschènes, M. -A.; Moss, V. A.; Murray, C. E.; Nidever, D.; Peek, J.; Stanimirović, S.; Staveley-Smith, L.; Tepper-Garcia, T.; Tremblay, C. D.; Uscanga, L.; van Loon, J. Th.; Vázquez-Semadeni, E.; Allison, J. R.; Anderson, C. S.; Ball, Lewis; Bell, M.; Bock, D. C. -J.; Bunton, J.; Cooray, F. R. ; Cornwell, T.; Koribalski, B. S.; Gupta, N.; Hayman, D. B.; Harvey-Smith, L.; Lee-Waddell, K.; Ng, A. ; Phillips, C. J.; Voronkov, M.; Westmeier, T.; Whiting, M. T. .  GASKAP-HI pilot survey science I: ASKAP zoom observations of HI emission in the Small Magellanic Cloud .  Publications of the Astronomical Society of Australia39   e005   2022.2Reviewed International coauthorship

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

    DOI： 10.1017/pasa.2021.59

  • Imai H., Ogawa H., Niinuma K., Shimizu Y., Oyama T., Miyazawa C., Nishimura A., Nosohara C., Okada N., Amada K., Matsusaka R., Nakashima K., Shum K.Y., Takahashi T., Tsutsumi T., Yoneyama S., Sawada-Satoh S., Shinnaga H., Yonekura Y., Hirota T., Kameno S. .  Double-/triple-bands Simultaneous Observation System with Perforated Dichroic Filter Plates Equipped for the Nobeyama 45 m Radio Telescope .  Asia Pacific Microwave Conference Proceedings APMC2022-November   587 - 589   2022

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    Language：Japanese   Publisher：Asia Pacific Microwave Conference Proceedings APMC  

    This paper introduces the Hybrid Integration Project in Nobeyama, Triple-band Oriented (HINOTORI) promoted with the 45 m telescope of Nobeyama Radio Observatory. The key development of the project was perforated dichroic filter plates installed in the quasi-optics of the telescope, enabling us to simultaneously observe in dual (22 and 43 GHz) and triple (22, 43, and 86 GHz) bands. HINOTORI has also upgraded the backend system for very long baseline interferometry (VLBI), enabling us to conduct three-millimeter VLBI observations in longer coherent data integration. This paper presents the specifications and the performance of the whole HINOTORI system including the filter plates that has been tested.

    Scopus

  • Baan, Willem A.; Imai, Hiroshi; Orosz, Gabor .  Fallback in bipolar Planetary Nebulae ? .  Research in Astronomy and Astrophysics21   275   2021.12Reviewed International coauthorship

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

    DOI： 10.1088/1674-4527/21/11/275

  • Khouri, Theo ; Vlemmings, Wouter H. T. ; Tafoya, Daniel ; Pérez-Sánchez, Andrés F. ; Sánchez Contreras, Carmen ; Gómez, José F. ; Imai, Hiroshi ; Sahai, Raghvendra .  Observational identification of a sample of likely recent common-envelope events .  Nature Astronomy6   275 - 286   2021.12Reviewed International coauthorship

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    Authorship：Last author  

    DOI： 10.1038/s41550-021-01528-4

  • Trinidad, Miguel A. ; Imai, Hiroshi ; de la Fuente, Eduardo ; Toledano-Juárez, Ivan ; Masqué, Joseph M. ; Rodríguez-Esnard, Tatianna .  Proper motions of water masers in the star-forming region IRAS 23139+5939 .  Publications of the Astronomical Society of Japan73   1669 - 1680   2021.12Reviewed International coauthorship

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

    DOI： 10.1093/pasj/psab103

  • Amada K., Fukaya S., Imai H., Scicluna P., Hirano N., Trejo-Cruz A., Zeegers S., Kemper F., Srinivasan S., Wallström S., Dharmawardena T., Shinnaga H. .  Statistical properties of cold circumstellar envelops observed in NESS-NRO .  Proceedings of the International Astronomical Union17 ( S370 ) 97 - 99   2021.8

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We conducted CO J=1→0 emission line observations for nearby AGB stars using the Nobeyama 45 m telescope. Comparing our results with those from CO J=3→2 observations with JCMT, the circumstellar envelopes observed in CO J=1→0 look more extended than J=3→2. Thus, we could trace the outer, cold parts of the envelopes. We also found four stars in which the CO/13CO ratio changes dramatically outward, but the change implies the effect of selective photodissociation by interstellar ultraviolet radiation, not the third dredge up in the stellar interior. We moreover found two unique stars with aspherical envelope morphology.

    DOI： 10.1017/S1743921323001783

    Scopus

  • Imai H., Amada K., Gómez J.F., Uscanga L., Tafoya D., Nakashima K., Shum K.Y., Hamae Y., Burns R., Orosz G. .  Water and silicon-monoxide masers monitored towards the water fountain sources .  Proceedings of the International Astronomical Union17 ( S370 ) 91 - 93   2021.8

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    Language：Japanese   Publisher：Proceedings of the International Astronomical Union  

    We have investigated the evolution of 12 water fountain sources in real time in the accompanying H2O 2o and SiO masers through our FLASHING (Finest Legacy Acquisitions of SiO-/ H2O 2o-maser Ignitions by Nobeyama Generation) project. It has been confirmed that these masers are excellent probes of new jet blob ejections, acceleration of the material supplied from the parental circumstellar envelope and entrained by the stellar jets yielding its deceleration. Possible periodic variations of the maser emission, reflecting properties of the central dying stars or binary systems, will be further investigated.

    DOI： 10.1017/S1743921322004355

    Scopus

  • Y. Uno, H. Imai, K. Shinano, H-H Qiao, J. R. Dawson, S. L. Breen, J.-F. Gómez .  Modelled 3D distribution of OH/IR stars in the Galactic disc .  Monthly Notices of the Royal Astronomical Society502   3012 - 3020   2021.1Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press  

    DOI： 10.1093/mnras/stab176

  • Nozomi Okada, Takeru Matsumoto, Hiroshi Kondo, Tatsuyuki Takashima, Sho Masui, Shota Ueda, Atsushi Nishimura, Takeshi Manabe, Toshikazu Onishi, Hideo Ogawa, Ryoko Amari, Toshihisa Tsutsumi, Takahiro Aoki, Satoko Sawada-Satoh, Kotaro Niinuma, Kenta Fujisawa, Kimihiro Kimura, Tetsuhiro Minamidani, Chieko Miyazawa, Hiroyuki Kaneko, Kazufumi Torii, Shigeru Takahashi, Yusuke Miyamoto, Kazuhiko Miyazawa, Tomoaki Oyama, Seiji Kameno, Hiroshi Imai .  Development of the multi-band simultaneous observation system of the Nobeyama 45-m Telescope in HINOTORI (Hybrid Installation project in NObeyama, Triple-band ORIented) .  Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X   1145349   2020.12

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  • The First VERA Astrometry Catalog .  Publications of the Astronomical Society of Japan72   50   2020.8Reviewed

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

  • FLASHING: New high-velocity H2O masers in IRAS 18286-0959 .  Publications of the Astronomical Society of Japan72   58   2020.8Reviewed

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

  • Qiao, Hai-Hua, Breen, Shari L.. Gómez, José F., Dawson, J. R., Walsh, Andrew J., Green, James A., Ellingsen, Simon P., Imai, Hiroshi, Shen, Zhi-Qiang .  Accurate OH Maser Positions from the SPLASH Survey. III. The Final 96 deg^2 .  The Astrophysical Journal Supplement Series247 ( 1 ) 5   2020.3Reviewed

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

  • Okada, Nozomi, Hashimoto, Ikumi, Kimura, Kimihiro, Manabe, Takeshi, Tokuda, Kazuki, Onishi, Toshikazu, Ogawa, Hideo, Imai, Hiroshi, Minamidani, Tetsuhiro .  Development of a 22/43 GHz-band quasi-optical perforated plate and dual-band observation system of the Nobeyama 45 m telescope .  Publications of the Astronomical Society of Japan72 ( 1 ) 7   2020.2Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press  

    DOI： 10.1093/pasj/psz126

  • Shakhvorostova, N. N., Sobolev, A. M., Moran, J. M., Alakoz, A. V., Imai, H., Avdeev, V. Y. .  RadioAstron probes the ultra-fine spatial structure in the H2O maser emission in the star forming region W49N .  Advances in Space Research65 ( 2 ) 772 - 779   2020.1Reviewed

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

    DOI： 10.1016/j.asr.2019.05.011

  • Asymmetric distributions of H2O and SiO masers towards V627 Cas .  Monthly Notices of the Royal Astronomical Society495   1284 - 1290   2020Reviewed

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  • Uscanga, L., Gómez, J. F., Yung, B. H. K., Imai, H., Rizzo, J. R., Suárez, O., Miranda, L. F., Trinidad, M. A., Anglada, G., Torrelles, J. M. .  Looking for new water-fountain stars .  Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time. Proceedings of the International Astronomical Union343   527 - 528   2019.12

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    DOI： 10.1017/S1743921318007354

  • Imai, Hiroshi, Nakagawa, Akiharu, Takaba, Hiroshi .  Overall variation of the H2O masers around W Hydrae in 28 years .  Publications of the Astronomical Society of Japan71 ( 6 ) 126   2019.12Reviewed

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    DOI： 10.1093/pasj/psz105

  • Kim, Jaeheon, Cho, S. -H., Bujarrabal, V., Imai, H., Dodson, R., Yoon, D. -H., Zhang, B. .  Time variations of H2O and SiO masers in the proto-Planetary Nebula OH 231.8+4.2 .  Monthly Notices of the Royal Astronomical Society488 ( 1 ) 1427 - 1445   2019.9Reviewed

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    DOI： 10.1093/mnras/stz1830

  • Hai-Hua Qiao, Andrew J. Walsh, Shari L. Breen, José F. Gómez, Joann R. Dawson, Hiroshi Imai, Simon P. Ellingsen, James A. Green, Zhi-Qiang Shen .  Accurate OH Maser Positions. II. The Galactic Center Region .  The Astrophysical Journal Supplement Series239   15   2018.11Reviewed

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    DOI： 20181100

  • Orosz, G., Gómez, J.F., Imai, H., Tafoya, D., Torrelles, J.M., Burns, R.A., Frau, P., Guerrero, M.A, Miranda, L.F., Perez-Torres, M.A., Ramos-Larios, G., Rizzo, J.R., Suárez, O., Uscanga, L. .  Rapidly evolving episodic outflow in IRAS 18113−2503: clues to the ejection mechanism of the fastest water fountain .  Monthly Notices of the Royal Astronomical Society482   L40 - L45   2018.10Reviewed

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  • Cho, S.-H., Yoon, D.-H., Yun, Y.-J., Choi, Y.-K., Dodson, R., Rioja, M., Kim, J.-H., Imai, H., Kim, D.-J., Yang H., Byun D.-Y. .  Astrometrically registered maps of H2O and SiO masers toward VX Sagittarii .  Nature Communications8   2534   2018.8Reviewed

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  • M. Rioja, R. Dodson, G. Orosz, G. H. Imai .  MultiView High Precision VLBI Astrometry at Low Frequencies .  IAU Symposium 336336   439 - 442   2018.8Reviewed

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  • Willem Baan, Alexey Alakoz, Tao An, Simon Ellingsen, Christian Henkel, Hiroshi Imai, Vladimir Kostenko, , Ivan Litovchenko, James Moran, Andrej Sobolev, Alexander Tolmachev, .  H2O MegaMasers: RadioAstron success story .  IAU Symposium 336336   422 - 425   2018.8Reviewed

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  • Nakashima, J., Engels, D., Hsia, C.-H., Imai, H., Ladeyschikov, D.A., Sobolev, A.M., Yung, B.H. .  The Extensive Database of Astrophysical Maser Sources (eDAMS): the First Release on Circumstellar Maser Sources .  IAU Symposium 336336   395 - 396   2018.8Reviewed

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  • Se-Hyung Cho, Hiroshi Imai 他 .  A study on evolved stars by simultaneous observations of H2O and SiO masers using KVN .  IAU Symposium 336336   359 - 364   2018.8Invited Reviewed

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  • Gabor Orosz, José F. Gómez, Daniel Tafoya, Hiroshi Imai, José M. Torrelles, .  Bow shocks in water fountain jets .  IAU Symposium 33614   351   2018.8Reviewed

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  • Hiroshi Imai .  Towards continuous viewing of circumstellar maser sources over decades .  IAU Symposium 336336   341 - 346   2018.8Invited Reviewed

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  • Mareki Honma, Hiroshi Imai 他 .  Maser Astrometry and Galactic Structure Study with VLBI .  IAU Symposium 336336   162 - 167   2018.8Invited Reviewed

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    DOI： 20180800

  • Sobolev, A.M., Moran, J.M., Grey, M.D., Alakoz, A., Imai, H., Baan, W.A., Tolmachev, A.M., Samodurov, V.A., Ladeyschchikov, D.A. .  Sun-sized Water Vapor Masers in Cepheus A .  Astrophysical Journal856   60   2018.5Reviewed

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  • Oyadomari, M., Imai, H., Nagayama, T., Oyama, T., Matsumoto, N., Nakashima, J., Cho, S.-H. .  Correlation between SiO v = 3 J = 1 → 0 maser excitation and the light curve of a long-period variable star .  Publications of the Astronomical Society of Japan70   33   2018.5Reviewed

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  • An, T., Sohn, B.-W., Imai, H. .  Capabilities and prospectives of the East Asia Very Long Baseline Interferometry Network .  Nature Astronomy2   118 - 125   2018.1Invited Reviewed

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  • Goldman, S.R., van Loon, J. Th., Gómez, J. F., Green, J.A., Zijlstra, A.A., Nanni, A., Imai, H., Whitelock, P.A., Groenewegen, M.A.T., Oliveira, J.M., .  A death of OH/IR stars in the Small Magellanic Cloud .  Monthly Notices of the Royal Astronomical Society473   3835 - 3853   2017.4Reviewed

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  • Orosz, G., Imai, H., Dodson, R., Rioja, M. J., Frey, S., Burns, R. A., Etoka, S., Nakagawa, A., Nakanishi, H., Asaki, Y., Goldman, S. R., and Tafoya, D. .  Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. Annual parallaxes of WX Psc and OH138.0+7.2 .  AJ153 ( 119 )   2017.3Reviewed

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  • Goddi, C., Surcis, G., Moscadelli, L., Imai, H. 他 .  Measuring Magnetic Fields from Water Masers Associated with the Synchrotron Protostellar Jet in W3(H2O) .  Astron. Astrophys.597 ( A43 )   2017.1Reviewed

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  • Burns, R. A., Handa, T., Imai, H., Nagayama, T., Omodaka, T., Hirota, T., Motogi, K., van Langevelde, H. J., Baan, W. A. .  Trigonometric distance and proper motions of H2O maser bowshocks in AFGL 5142 .  MNRAS467 ( 2367 )   2017.1Reviewed

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  • Rioja, M. J., Dodson, R., Orosz, G., Imai, H., Frey, S. .  MultiView High Precision VLBI Astrometry at Low Frequencies .  AJ153 ( 105 )   2017.1Reviewed

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  • Goldman, S. R., van Loon, J. Th., Zijlstra, A. A., Green, J. A., Wood, P. R., Ambra, N., Imai, H., Whitelock, P. A., Matsuura, M., Groenewege, M. A., Gómez, J. F. .  The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity .  Monthly Notices of the Royal Astronomical Society465 ( 403 )   2016.12Reviewed

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  • Takefuji, K., Imai, H., Sekido, M. .  Development of cross-correlation spectromery and the coherent structures of maser sources .  PASJ68   86   2016.10Reviewed

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  • Youngjoo Yun, Se-Hyung Cho, Hiroshi Imai, et al. .  SiO Masers around WX Psc Mapped with the KVN and VERA Array (KaVA) .  The Astrophysical Journal822   3   2016.4Reviewed

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  • Yung, B.H.K., Nakashima, J.-I., Hsia, C.-H., Imai, H. .  Do water fountains jets really indicate the onset of the morphological metamorphosis of circumstellar envelopes? .  MNRAS465 ( 4482 )   2016.3Reviewed

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  • Qiao, H.-H, Imai, H. 他 .  Unusual Shock-excited OH maser emission in a Young Planetary Nebula .  The Astrophysical Journal817   37   2016Reviewed

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  • Burns, R.A., Imai H. 他 .  Molecula jet emission and spectroscopic survey of S235AB .  Astronomy and Astrophisics586   34   2016Reviewed

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  • Oyama, T., Kono, Y.,Imai, H.　他 .  First Simultaneous mapping of four 7 mm SiO maser lines using the OCTAVE System .  Publ. Astron. Soc. Japan68   105   2016Reviewed

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  • Burns, R.A., Imai H. 他 .  A Water Spout’ Maser Jet in the S235AB-MIR Massive Young Stellar Object .  Monthly Notice of the Royal Astronomical Society453   3163 - 3173   2015Reviewed

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  • Naskanishi, H., Imai, H.　他 .  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 Japan67   68 - 13pages   2015Reviewed

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  • Chong, S.-N., Imai, H. 他 .  Water Masers in W43A: Early Morphological Changes of a Future Planetary Nebula .  The Astrophysical Journal67   53 - 9pages   2015Reviewed

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  • Yoshiura, S., Imai, H.　他 .  Sensitivity for 21cm Bispectrum from Epoch of Reionization .  Monthly Notice of the Royal AstronomicalSociety451   266 - 274   2015Reviewed

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  • Y. Asaki, H. Imai, A. M. Sobolev, S. Yu. Parfenov .  DISTANCE AND PROPER MOTION MEASUREMENT OF WATER MASERS IN SHARPLESS 269 IRS 2w .  The Astrophysical Journal787   54 - 9 pages   2014.5Reviewed

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  • J. R. Dawson, A. J. Walsh, P. A. Jones, S. L. Breen, M. R. Cunningham,V. Lowe, C. Jones, C. Purcell, J. L. Caswell, E. Carretti,N. M. McClure-Griths, S. P. Ellingsen, J. A. Green, J. F. Gomez,V. Krishnan, J. M. Dickey, H. Imai, S. J. Gibson, P. Hennebelle,N. Lo, T. Hayakawa, Y. Fukui, and A. Mizuno .  SPLASH: the Southern Parkes Large-Area Survey in Hydroxyl - first science from the pilot region .  Monthly Notices of the Royal Astronomical Society439   1596 - 1614   2014.4Reviewed

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  • Asaki, Y., Imai, H. 他 .  Distance and Proper Motion Measurement of Water Masers in Sharpless 269 IRS 2w .  The Astrophysical Journal787   54 - 9pages   2014Reviewed

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  • Chibueze, J.O., Imai, H. 他 .  Astrometry and Spatio-kinematics of H2O Masers in the Massive Star-forming Region NGC 6334I(North) with VERA .  The Astrophysical Journal784   114 - 8pages   2014Reviewed

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  • Hirota,T., Imai,H. 他 .  VERA and ALMA Observations of the H2O supermaser burst in Orion KL .  Publications of the Astronomical Society of Japan66   106   2014Reviewed

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  • Hiroshi Imai, Jun-ichi Nakashima,Shuji Deguchi, Sun Kwok, Philip J. Diamond .  The Spatio-kinematical Structure of H2O and OH Masers in the"Water Fountain" Source IRAS 18460-0151 .  Astrophysical Journal773   182 - 12pages   2013.8Reviewed

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  • Hiroshi Imai, Jun-ichi Nakashima, Bosco Yung H.K., Shuji Deguchi, Sun Kwok, Philip J. Diamond .  Relic Circumstellar Envelope in the ``Water Fountain" Source IRAS18286-0959 .  Astrophysical Journal771   47 - 11pages   2013.7Reviewed

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  • Richard Dodson, Maria Rioja, Yoshiharu Asaki, Hiroshi Imai, X.-H. Hong, Zhi-Qing. Shen .  THE APPLICATION OF MULTIVIEW METHODS FOR HIGH-PRECISION ASTROMETRIC SPACE VLBI AT LOW FREQUENCIES .  The Astronomical Journal145   147 - 11pages   2013.5Reviewed

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  • Bosco Yung H.K., Jun-ichi Nakashima,Hiroshi Imai, Shuji Deguchi, Sun Kwok .  Water Maser Survey on AKARI and IRAS Sources: A Search for “Low-velocity” Water Fountains .  Astrophysical Journal769   20 - 18pages   2013.5Reviewed

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  • H. Imai, T. Kurayama, M. Honma, and T. Miyaji .  Annual Parallax Distance and Secular Motion of the Water Fountain Source IRAS 18286-0959 .  Publications of the Astronomical Society of Japan65 ( 2 ) 28 - 9pages   2013.4Reviewed

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  • H. Imai, Y. Katayama, S. P. Ellingsen, Y. Hagiwara .  ATCA survey of H2O masers in the Large Magellanic Cloud .  Monthly Notices of the Royal Astronomical Society Letters432   16 - 20   2013.3Reviewed

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  • John M. Dickey, Naomi McClure-Griffiths, John S. Gibson, Jose F. Gomez. J., Hiroshi Imai, et al. (56 authors) .  GASKAP - The Galactic ASKAP Survey .  Publications of the Astronomical Society of Australia30   e003   2013.2Reviewed

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  • Hiroshi Imai .  Water fountains: bipolar fast stellar jets traced by water vapor maser emission .  Feeding Compact Objects: Accretion on All Scales, Proceedings of the International Astronomical Union Symposium 290   227 - 228   2013.2

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  • Imai, H., Nakashima, J. 他 .  EXPLORATION OF A RELIC CIRCUMSTELLAR ENVELOPE IN THE "WATER FOUNTAIN”, SOURCE IRAS 18286–0959 .  The Astrophysical Journal771   47 - 11pages   2013Reviewed

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  • Imai, H., Nakashima, J. 他 .  The Spatio-Kinematical Structure of H2O and OH Masers in the ‘Water Fountain’ Source IRAS 18460-0151 .  The Astrophysical Journal773   182 - 12pages   2013Reviewed

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  • Dodson, R., Rioja, M.J., Asaki, Y., Imai, H., Hong, X.-Y, Shen, Z. .  Application of MultiView Methods for High Precision Astrometric Space VLBI at Low Frequencies .  The Astronomucal Journal145   147 - 11pages   2013Reviewed

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  • Sze Ning Chong, Sun Kwok, Hiroshi Imai, Daniel Tafoya, James Chibueze O. .  Multipolar Planetary Nebulae: Not as Geometrically Diversified as Thought .  Astrophysical Journal760   115   2012.12Reviewed

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  • Hiroshi Imai, Miyako Oyadomari, Sze Ning Chong, Akiharu Nakagawa, Tomoharu Kurayama, Jun-ichi Nakashima, Naoko Matsumoto, Takumi Nagayama, Tomoaki Oyama, Shota Mizuno, Shuji Deguchi, Se-Hyung Cho .  Pilot VLBI Survey of SiO v=3 J=1-0 Maser Emission around Evolved Stars .  Publications of the Astronomical Society of Japan64 ( 6 ) L6   2012.12Reviewed

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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   142 - 11pages   2012.12Reviewed

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  • Hiroshi Imai, Sze-Ning Chong, Jin-Hua He, Jun-ichi Nakashima, Chih-Hao Hsia, Takeshi Sakai, Shuji Deguchi, Nico Koning .  Extremely Strong 13CO J = 3--2 Line in the ``Water Fountain'' IRAS 16342-3814: Evidence for the Hot-Bottom Burning .  Publications of the Astronomical Society of Japan64 ( 5 ) 87 - 8pages   2012.10Reviewed

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  • Haruka Yamaki, Seiji Kameno, Hisayuki Beppu, Izumi Mizuno, Hiroshi Imai .  Optimization by Smoothed Bandpass Calibration in Radio Spectroscopy .  Publications of the Astronomical Society of Japan64 ( 5 ) 117 - 9pages   2012.10Reviewed

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  • Hiroshi Imai, Daniel Tafoya, VERA collaboration .  Trigonometric parallax measurements of post-AGB stars with VERA .  Planetary Nebulae: An Eye to the Future, Proceedings of the International Astronomical Union Symposium283   394 - 395   2012.8Reviewed

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  • Makoto Miyoshi, Yoshiharu Asaki, Kei-ichi Wada, Hiroshi Imai .  Analysis of H_2O masers in Sharpless 269 using VERA archival data-Effect of maser structures on astrometric accuracy .  New Astronomy17   553 - 564   2012.8Reviewed

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  • Hiroshi Imai, VERA collaboration .  Astrometry of H_2O masers in post-AGB stars .  From OH to H_0, Proceedings of the International Astronomical Union Symposium287   411 - 412   2012.7Reviewed

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  • James Chibueze Okwe, Hiroshi Imai, Daniel Tafoya, Toshihiro Omodaka, Osamu Kameya, Tomoya Hirota, Sze-Ning Chong, Jose Maria Torrelles .  A HIGHLY COLLIMATED WATER MASER BIPOLAR OUTFLOW IN THE CEPHEUS A HW3d MASSIVE YOUNG STELLAR OBJECT .  Astrophysical Journal748   146 - 157   2012.4Reviewed

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  • Tatsuya Kamezaki, Akiharu Nakagawa, Toshihiro Omotaka, Tomoharu Kurayama, Hiroshi Imai, Daniel Tafoya, Makoto Matsui, Yoshiro Nishida, Takumi Nagayama, Mareki Honma, Hideyuki Kobayashi, Mine Takeuchi .  VLBI Astrometry of the Semiregular Variable RX Bootis .  Publications of the Astronomical Society of Japan64 ( 1 ) 7 - 8pages   2012.2Reviewed

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  • Honma, M., Imai, H., 他 .  Fundamental Parameters of the Milky Way Galaxy Based on VLBI Astrometry .  Publications of the Astronomical Society of Japan64   136 - 13pages   2012Reviewed

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  • Hiroshi Imai, Rui Omi, Tomoharu Kurayama, Takumi Nagayama, Tomoya Hirota, Takeshi Miyaji, Toshihiro Omodaka .  Multiple Outflows Traced by H2O Masers around the Ultra-Compact HII Region G 34.26+0.15 .  Publications of the Astronomical Society of Japan63 ( 6 ) 1293 - 1311   2011.12Reviewed

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  • Satoshi Shiozaki, Hiroshi Imai, Daniel Tafoya, Toshihiro Omodaka, Tomoya Hirota, Mareki Honma, Makoto Matsui, Yuji Ueno .  H_2O maser motions and the distance of the star forming reiong G192.16-3.84 .  Publications of the Astronomical Society of Japan63 ( 6 ) 1219 - 1228   2011.12Reviewed

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  • Tomoya Hirota, Makoto Tsuboi, Kenta Fujisawa, Mareki Honma, Noriyuki Kawaguchi, Mi Kyoung Kim, Hideyuki Kobayashi, Hiroshi Imai, Toshihiro Omodaka, katsunori Shibata M., Tomomi Shimoikura, Yoshinori Yonekura .  IDENTIFICATION OF BURSTING WATER MASER FEATURES IN ORION KL .  Astrophysical Journal739   L59 - L62   2011.8Reviewed

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  • Tomoharu Kurayama, Akiharu Nakagawa, Satoko Sawada-Satoh, Katsuhisa Sato, Mareki Honma, Kazuyoshi Sunada, Tomoya Hirota, Hiroshi Imai .  Annual Parallax Measurements of an Infrared Dark Cloud MSXDC G034.43+00.24 with VERA .  Publications of the Astronomical Society of Japan63 ( 3 ) 513 - 525   2011.6Reviewed

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  • Bosco Yung H.K., Jun-ichi Nakashima, Hiroshi Imai, Shuji Deguchi, Philip J. Diamond, Sun Kwok .  HIGH VELOCITY PRECESSING JETS FROM THE WATER FOUNTAIN IRAS 18286-0959 REVEALED BY VERY LONG BASELINE ARRAY OBSERVATIONS .  Astrophysical Journal741   94 - 107   2011.3Reviewed

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  • Daisuke Nyu, Akiharu Nakagawa, Makoto Matsui, Hiroshi Imai, Yoshiaki Sofue, Toshihiro Omodaka, Tomoharu Kurayama, Ryuichi Kamohara, Tomoya Hirota, Mareki Honma, Katsunori Shibata M., Hideyuki Kobayashi, Kenzaburo Iwadate, Takeshi Miyaji .  Astrometry of AGB Variables with VERA --- Annual Parallax and the orbit of SY~Sculptoris in the Galaxy --- .  Publications of the Astronomical Society of Japan63 ( 1 ) 63 - 70   2011.2Reviewed

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  • Kazuma Ando, Takumi Nagayama, Toshihiro Omodaka, Toshihiro Handa, Hiroshi Imai, Akiharu Nakagawa, Hiroyuki Nakanishi, Mareki Honma, Hideyuki Kobayashi, Takeshi Miyaji .  Astrometry of Galactic Star-Forming Region ON 2N with VERA: Estimation of the Galactic Constants .  Publications of the Astronomical Society of Japan63 ( 1 ) 45 - 51   2011.2Reviewed

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  • Tomoya Hirota, Mareki Honma, Hiroshi Imai, Kazuyoshi Sunada, Yuji Ueno, Hideyuki Kobayashi, Noriyuki Kawaguchi .  Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA --- IV. L1448C .  Publications of the Astronomical Society of Japan63 ( 1 ) 1 - 8   2011.2Reviewed

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  • Daniel Tafoya, Hiroshi Imai, Yolanda Gomez, Jose Maria Torrelles, Nimesh Patel A., Guilem Anglada, Luis Miranda F., Mareki Honma, Tomoya Hirota, Takeshi Miyaji .  Measurement of the Distance and Proper Motions of the H2O Masers in the Young Planetary Nebula K 3-35 .  Publications of the Astronomical Society of Japan63 ( 1 ) 71 - 80   2011.2Reviewed

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  • Hiroshi Imai, Daniel Tafoya, Tomoya Hirota, Mareki Honma, Takeshi Miyaji .  Annual Parallax Distance and Kinematical Property of H2O Masers in IRAS 19312+1950 .  Publications of the Astronomical Society of Japan63 ( 1 ) 81 - 87   2011.2Reviewed

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  • Jun-ichi Nakashima, Shuji Deguchi, Hiroshi Imai, Athol Kemball, Murrey Lewis B. .  Maser Properties of the Enigmatic IRAS Source 19312+1950 .  Astrophysical Journal728   266 - 277   2011.1Reviewed

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  • Yoshiharu Asaki, Shuji Deguchi, Hiroshi Imai, Kazuya Hachisuka, Makoto Miyoshi, Mareki Honma .  DISTANCE AND PROPER MOTION MEASUREMENT OF THE RED SUPERGIANT, S PERSEI, WITH VLBI H2O MASER ASTROMETRY .  Astrophysical Journal721   266 - 277   2010.10Reviewed

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  • Hiroshi Imai, Jun-ichi Nakashima, Shuji Deguchi, Aya Yamauchi, Akiharu Nakagawa, Takumi, Nagayama .  Japanese VLBI Network Mapping of SiO v = 3 J = 1--0 Maser Emission in W Hydrae .  Publications of the Astronomical Society of Japan62 ( 2 ) 431 - 439   2010.4Reviewed

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  • Ryuichi, Kamohara, Valentin Bujarrabal, Mareki Honma, Akiharu Nakagawa, Naoko Matsumoto, Tomoaki Oyama, Hiroshi Imai, Katsunori M. Shibata, Hideyki Kobayashi, Katsuhisa Sato, Yuji Ueno .  VERA observations of SiO maser emission from R Aquarii .  Astronomy and Astrophysics510   69 - 83   2010.3Reviewed

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  • Hiroshi Imai, Jin-Hua He, Jun-ichi Nakashima, Nobuharu Ukita, Shuji Deguchi, Nico Koning .  CO J=3-2 Emission from the "Water Fountain" Sources IRAS 16342-3814 and IRAS 18286-0959 .  Publications of the Astronomical Society of Japan61 ( 6 ) 1365 - 1372   2009.12Reviewed

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  • Hiroshi Imai .  Review: Cosmic Water Fountains in Radio Emission .  AGB Stars and Related Phenomena, A Conference in Honor of Yoshikazu Nakada   62 - 65   2009.1

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  • Mareki HONMA,Masachika KIJIMA, Hiroshi SUDA, Noriyuki KAWAGUCHI, Hideyuki KOBAYASHI, Takes hi BUSHIMATA, Rie SHIMIZU, Akane YOSHIMURA, Tetsuo SASAO,Tomoya HIROTA, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE, Osamu KAMEYA, Ryuichi KAMOHARA, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Takes hi MIYAJI, Akiharu NAKAGAWA, Toshihiro OMODAKA, Tomoaki OYAMA, Satoshi SAKAI, Katsuhisa SATO, Katsunori M. SHIBATA, Yoshiaki TAMURA .  Dual-Beam Delay Calibration for VERA .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 935 - 950   2008.10Reviewed

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  • Motonobu SHINTANI, Hiroshi IMAI, Kazuma ANDO, Kouichiro NAKASHIMA, Tomoya HIROTA, Noritomo INOMATA, Takayuki KAI, Seiji KAMENO, Masachika KIJIMA, Hideyuki KOBAYASHI, Mina KUROKI, Toshihisa MAEDA, Kenta MARUYAMA, Naoko MATSUMOTO, Takes hi MIYAJI, Takumi NAGAYAMA, Riiko NAGAYOSHI, Kayoko NAKAMURA, Akiharu NAKAGAWA, Daichi NAMIKAWA, Toshihiro OMODAKA, Tomoaki OYAMA, Seiichiro SAKAKIBARA, Rie SHIMIZU, Kasumi SORA, Miyuki TSUSHIMA, Kosuke UEDA, Yuya UEDA, Kazuyoshi YAMASHITA .  Statistical Properties of Stellar H2O Masers - Results of Three-Year Single-Dish Observations with the VERA Iriki Telescope .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1077 - 1131   2008.10Reviewed

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  • Takumi NAGAYAMA, Koji TAKEDA, Toshihiro OMODAKA, Hiroshi IMAI, Seiji KAMENO, Yoshiaki S OFUE, Akihiro DOI, Kenta FUJISAWA, Asao HABE, Mareki HONMA, Noriyuki KAWAGUCHI, Eiji KAWAI, Hideyuki KOBAYASHI, Yasuhiro KOYAMA, Yasuhiro MURATA, Kazuo SORAI, Hiroshi SUDOU, Hiroshi TAKABA, Sayaka TAMURA, Ken-ichi WAKAMATSU .  H2O Maser Outflow from the Red Supergiant Star NML Cygni Observed with Japanese VLBI Network .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1069 - 1075   2008.10Reviewed

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  • Toshihisa MAEDA, Hiroshi IMAI, Toshihiro OMODAKA, Hideyuki KOBAYASHI, Katsunori M. SHIBATA, Takeshi BUSHIMATA, Yoon Kyung CHOI, Tomoya HIROTA, Mareki HONMA, Koji HORIAI, Noritomo INOMATA, Kenzaburo IWADATE, Takaaki JIKE, Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Takes hi MIYAJI, Takumi NAGAYAMA, Akiharu NAKAGAWA, Kouichiro NAKASHIMA, Chung Sik OH, Tomoaki OYAMA, Satoshi SAKAI, Seiichiro SAKAKIBARA, Katsuhisa SATO, Rie SHIMIZU, Motonobu SHINTANI, Kasumi SORA, Hiroshi SUDA, Yoshiaki TAMURA, Kazuyoshi YAMASHITA .  A Bipolar Outflow of the M-Type Giant IRC-10414 Traced by H2O Maser Emission .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1057 - 1067   2008.10Reviewed

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  • Kosuke UEDA, Hiroshi IMAI, Shuji DEGUCHI, Ryuichi KAMOHARA, Toshihisa MAEDA, Naoko MATSUMOTO, Toshihiro OMODAKA .  Japanese VLBI Network Observations of SiO Masers in the M-Type Giant IRC-10414 .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1051 - 1056   2008.10Reviewed

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  • Naoko MATSUMOTO, Toshihiro OMODAKA, Hiroshi IMAI, Rie SHIMIZU, Takeshi BUSHIMATA, Yoon Kyung CHOI, Tomoya HIROTA, Mareki HONMA, Noritomo INOMATA, Kenzaburo IWADATE, Takaaki JIKE, Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Hideyuki KOBAYASHI, Seisuke KUJI, Tomoharu KURAYAMA, Toshihisa MAEDA, Seiji MANABE, Takes hi MIYAJI, Akiharu NAKAGAWA, Takumi NAGAYAMA, Koichiro NAKASHIMA, Chung Sik OH, Tomoaki OYAMA, Satoshi SAKAI, Seiichiro SAKAKIBARA, Tetsuo SASAO, Katsuhisa SATO, Katsunori M. SHIBATA, Motonobu SHINTANI, Yoshiaki SOFUE, Kasumi SORA, Hiroshi SUDA, Yoshiaki TAMURA, Miyuki TSUSHIMA, Kazuyoshi YAMASHITA .  Variable Asymmetry of the Circumstellar Envelope in IK Tauri Traced by SiO Maser Emission .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1039 - 1050   2008.10Reviewed

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  • Ryuichi KAMOHARA, Valentin BUJARRABAL, Takeshi BUSHIMATA, Yoon Kyung CHOI, Tomoya HIROTA, Mareki HONMA, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE, Osamu KAMEYA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Mi Kyoung KIM, Masachika KIJIMA, Hideyuki KOBAYASHI, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Takeshi MIYAJI, Takumi NAGAYAMA, Akiharu NAKAGAWA, Chung Sik OH, Toshihiro OMODAKA, Tomoaki OYAMA, Satoshi SAKAI, Tetsuo SASAO, Katsuhisa SATO, Mayumi SATO, Katsunori M. SHIBATA,Yoshiaki TAMURA, Kazuyoshi YAMASHITA .  VERA Observations of SiO Masers in the Symbiotic Star R Aquarii .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1023 - 1029   2008.10Reviewed

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  • Akiharu NAKAGAWA, Miyuki TSUSHIMA, Kazuma ANDO, Takeshi BUSHIMATA, Yoon Kyung CHOI, Tomoya HIROTA, Mareki HONMA, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE,7Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Masachika KIJIMA, Mi Kyoung KIM, Hideyuki KOBAYASHI, Seisuke KUJI, Tomoharu KURAYAMA, Toshihisa MAEDA, Seiji MANABE, Kenta MARUYAMA, Makoto MATSUI, Naoko MATSUMOTO, Takes hi MIYAJI, Takumi NAGAYAMA, Kayoko NAKAMURA, Daisuke NYU, Chung Sik OH, Toshihiro OMODAKA, Tomoaki OYAMA, Nicolas PRADEL, Satoshi SAKAI, Tetsuo SASAO, Katsuhisa SATO, Mayumi SATO, Katsunori M. SHIBATA, Hiroshi SUDA, Yoshiaki TAMURA, Kousuke UEDA, YujiU ENO, Kazuyoshi YAMASHITA .  VLBI Astrometry of AGB Variables with VERA -A Semiregular Variable S Crateris - .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1013 - 1021   2008.10Reviewed

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  • Mi Kyoung KIM, Tomoya HIROTA, Mareki HONMA, Hideyuki KOBAYASHI, Takeshi BUSHIMATA, Yoon Kyung CHOI, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE, Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Makoto MATSUI, Naoko MATSUMOTO, Takeshi MIYAJI, Takumi NAGAYAMA, Akiharu NAKAGAWA, Chung Sik OH, Toshihiro OMODAKA, Tomoaki OYAMA, Satoshi SAKAI, Katsuhisa SATO, Tetsuo SASAO, Mayumi SATO, Katsunori M. SHIBATA, Yoshiaki TAMURA, Kazuyoshi YAMASHITA .  SiO Maser Observations toward Orion-KL with VERA .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 991 - 999   2008.10Reviewed

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  • Mayumi SATO, Tomoya HIROTA, Mareki HONMA, Hideyuki KOBAYASHI, Tetsuo SASAO, Takeshi BUSHIMATA, Yoon Kyung CHOI, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE, Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Mi Kyoung KIM, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Makoto MATSUI, Naoko MATSUMOTO, Takeshi MIYAJI, Takumi NAGAYAMA, Akiharu NAKAGAWA, Kayoko NAKAMURA, Chung Sik OH, Toshihiro OMODAKA, Tomoaki OYAMA, Satoshi SAKAI, Katsuhisa SATO, Katsunori M. SHIBATA, Yoshiaki TAMURA, Kazuyoshi YAMASHITA .  Distance to NGC 281 in a Galactic Fragmenting Superbubble: Parallax Measurements with VERA .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 975 - 989   2008.10Reviewed

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  • Tomoya HIROTA, Kazuma ANDO, Takeshi BUSHIMATA, Yoon Kyung CHOI, Mareki HONMA, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE, Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Masachika KIJIMA, Mi Kyoung KIM, Hideyuki KOBAYASHI, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Makoto MATSUI, Naoko MATSUMOTO, Takes hi MIYAJI, Atsushi MIYAZAKI, Takumi NAGAYAMA, Akiharu NAKAGAWA, Daichi NAMIKAWA, Daisuke NYU, Chung Sik OH, Toshihiro OMODAKA, Tomoaki OYAMA, Satoshi SAKAI, Tetsuo SASAO, Katsuhisa SATO, Mayumi SATO, Katsunori M. SHIBATA, Yoshiaki TAMURA, Kosuke UEDA, Kazuyoshi YAMASHITA .  Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA III. IRAS 22198+6336 in Lynds 1204 G .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 961 - 974   2008.10Reviewed

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  • K. Motogi, Y. Watanabe, Kazuo Sorai, Asao Habe, Mareki Honma, Hiroshi Imai, Aya Yamauchi, Hideyuki Kobayashi, Kenta Fujisawa, Toshihiro Omodaka, Hiroshi Takaba, Katsunori M. Shibata, T. Minamidani, Ken-ichi Wakamatsu, Hiroshi Sudou, Eiji Kawai, Yasuhiro Koyama .  Microstructure and kinematics of H2O masers in the massive star-forming region IRAS 06061+2151 .  Publications of the Astronomical Society of Japan390 ( 2 ) 523 - 534   2008.10Reviewed

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  • Jun-ichi Nakashima, Shuji Deguchi, Hiroshi Imai, Athol Kemball .  Molecular line observations of the SiO maser source IRAS 19312+1950 .  Organic Matter in Space, Proceedings of the International Astronomical Union251   165 - 166   2008.10

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  • Yoon Kyung CHOI, Tomoya HIROTA, Mareki HONMA, Hideyuki KOBAYASHI, Takeshi BUSHIMATA, Hiroshi IMAI, Kenzaburo IWADATE, Takaaki JIKE, Seiji KAMENO, Osamu KAMEYA, Ryuichi KAMOHARA, Yukitoshi KAN-YA, Noriyuki KAWAGUCHI, Masachika KIJIMA, Mi Kyoung KIM, Seisuke KUJI, Tomoharu KURAYAMA, Seiji MANABE, Kenta MARUYAMA, Makoto MATSUI, Naoko MATSUMOTO, Takeshi MIYAJI, Takumi NAGAYAMA, Akiharu NAKAGAWA, Kayoko NAKAMURA, Chung Sik OH, Toshihiro OMODAKA, Tomoaki OYAMA, Satoshi SAKAI, Tetsuo SASAO, Katsuhisa SATO, Mayumi SATO, Katsunori M. SHIBATA, Yoshiaki TAMURA, Miyuki TSUSHIMA, Kazuyoshi YAMASHITA .  Distance to VY Canis Majoris with VERA .  Publicaitons of the Astronomical Society of Japan60 ( 5 ) 1007 - 1012   2008.10Reviewed

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  • Jin-Hua He, Hiroshi Imai, Tatsuhiko Hasegawa, I. T., Campbell, Simon., Jun-ichi Nakashima .  First detection of CO lines in a water fountain star .  Astronomy & Astrophysics488 ( 2 ) L21 - L24   2008.9Reviewed

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  • Takumi Nagayama, Akiharu Nakagawa, Hiroshi Imai, Toshihiro Omodaka, Yoshiaki Sofue .  VLBI Observations of Water Masers in Onsala1: Massive Binary Star-Forming Site? .  Publications of the Astronomical Society of Japan60 ( 2 ) 183 - 190   2008.4Reviewed

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  • Tomoaki Oyama, Makoto Miyoshi, Shuji Deguchi, Hiroshi Imai, Zhi-Qiang Shen .  A Measurement of Proper Motions of SiO Maser Sources in the Galactic Center with the VLBA .  Publicaitons of the Astronomical Society of Japan60 ( 1 ) 11 - 22   2008.3Reviewed

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  • Hiroshi Imai, Takahiro Fujii, Toshihiro Omodaka, Shuji Deguchi .  JVN observations of H2O masers around the evolved star IRAS22480+6002 .  Publicaitons of the Astronomical Society of Japan60 ( 1 ) 55 - 62   2008.3Reviewed

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  • Tomoya Hirota, Takeshi Bushimata, Yoon Kyung Choi, Mareki Honma, Hiroshi Imai, Kenzaburo Iwadate, Takaaki Jike, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-ya, Noriyuki Kawaguchi, Masachika Kijima, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Tetsuo Sasao, Katsuhisa Sato, Katsunori M. Shibata, Yoshiaki Tamura, Kazuyoshi Yamashita .  Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA II SVS13 in NGC1333 .  Publications of the Astronomical Society of Japan60 ( 1 ) 37 - 44   2008.3Reviewed

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  • Hiroshi Imai .  Stellar molecular jets traced by maser emission .  International Astronomical Union242   279 - 286   2008.1Reviewed

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  • Hiroshi Imai, Kohichiro Nakashima, Takeshi Bushimata, Yoon Kyung Choi, Tomoya Hirota, Mareki Honma, Koji Horiai, Noritomo Inomata, Kenzaburo Iwadate, Takaaki Jike, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-ya, Noriyuki Kawaguchi, Masachika Kijima, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Seiichiro Sakakibara, Katsuhisa Sato, Tetsuo Sasao, Katsunori M. Shibata, Rie Shimizu, Motonobu Shintani, Yoshiaki Sofue, Kasumi Sora, Hiroshi Suda, Yoshiaki Tamura, Miyuki Tsushima, Yuji Ueno, Kazuyoshi Yamashita .  Astrometry of H2O Masers in Nearby Star-Forming Regions with the VERA -- I. IRAS 16293-2422 in ρ Oph East .  Publicaitons of the Astronomical Society of Japan59 ( 6 ) 1107 - 1113   2007.12Reviewed

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  • Hiroshi Imai, Raghvendra Sahai, Mark Morris .  The spatio-kinematical structure and distance of the pre-planetary nebula IRAS 19134+2131 .  Astrophysical Journal669   424 - 434   2007.11Reviewed

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  • Mareki Honma, Takeshi Bushimata, Yoon Kyung Choi, Tomoya Hirota, Hiroshi Imai, Kenzaburo Iwadate, Takaaki Jike, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-Ya, Noriyuki Kawaguchi, Masachika Kijima, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Katsuhisa Sato, Tetsuo Sasao, Katsunori M. Shibata, Motonobu Shintani, Hiroshi Suda, Yoshiaki Tamura, Miyuki Tsushima, Kazuyoshi Yamashita .  Astrometry of Galactic Star Forming Region Sharpless 269 with VERA: Parallax Measurements and Constraint on Outer Rotation Curve .  Publicaitons of the Astronomical Society of Japan59 ( 5 ) 889 - 895   2007.10Reviewed

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  • Tomoya Hirota, Takeshi Bushimata, Yoon Kyung Choi, Mareki Honma, Hiroshi Imai, Kenzaburo Iwadate, Takaaki Jike, Seiji Kameno, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-Ya,Noriyuki Kawaguchi, Masachika Kijima, Mi Kyoung Kim, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Kenta Maruyama, Makoto Matsui, Naoko Matsumoto, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Kayoko Nakamura, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Tetsuo Sasao, Katsuhisa Sato, Mayumi Sato, Katsunori M. Shibata, Motonobu Shintani, Yoshiaki Tamura, Miyuki Tsushima, Kazuyoshi Yamashita .  Distance to Orion KL Measured with VERA .  Publicaitons of the Astronomical Society of Japan59 ( 5 ) 897 - 903   2007.10Reviewed

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  • Shuji Deguchi, Takahiro Fujii, Yoshifusa Ita, Hiroshi Imai, Hideyuki Izumiura, Osamu Kameya, Noriyuki Matsunaga, Atsushi Miyazaki, Akihiro Mizutani, Yoshikazu Nakada, Jun-ichi Nakashina, Anders Winnberg .  SiO Maser Search off the Galactic Plane .  Publications of the Astronomical Society of Japan59 ( 3 ) 559 - 587   2007.6Reviewed

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  • Mayumi Sato, T. Hirota, Mareki Honma, Hideyuki Kobayashi, Tetsuo Sasao, Takeshi Bushimata, Yoon Kyung Choi, Hiroshi Imai, Kenzaburo Iwadate, Takaaki Jike, Seiji Kameno, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-Ya, Niriyuki Kawaguchi, Masachika Kijima, Mi Kyoung Kim, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Kenta Maruyama, Makoto Matsui, Naoko Matsumoto, Takeshi Miyaji, Takumi Nagayama, Akiharu Nakagawa, Kayoko Nakamura, Chung-Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Satoshi Sakai, Katsuhisa Sato, Katsunori M. Shibata, Motonobu Shintani, Yoshiaki Tamura, Miyuki Tsushima, Kazuyoshi Yamashita .  Absolute Proper Motions of H2O Masers Away from the Galactic Plane Measured with VERA in the "Superbubble" Region NGC 281 .  Publicaitons of the Astronomical Society of Japan59 ( 3 ) 743 - 751   2007.6Reviewed

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  • Noritomo Inomata, Hiroshi Imai, Toshihiro Omodaka .  A Pole-on Bipolar Outflow from the AGB Star WX Piscium .  Publication of the Astronomical Society of Japan59 ( 3 ) 779 - 809   2007.6Reviewed

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  • Hiroshi Imai, Toshihiro Omodaka, Tomoya Hirota, Tomofumi Umemoto, Kazuo Sorai, Tetsuro Kondo .  A Collimated Jet and an Infalling-Rotating Disk in G192.16-3.84 Traced by H2O Maser Emission .  Publications of the Astronomical Society of Japan58 ( 5 ) 883 - 892   2006.10Reviewed

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  • Xi Chen Xi, Zhigiang Shen, Ryuichi Kamohara Ryuichi, Hiroshi Imai .  INWARD MOTIONS OF THE COMPACT SiO MASERS AROUND VX SAGITTARII .  Astrophysical Journal640 ( 1 ) 982 - 994   2006.4Reviewed

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  • Kazuya Hachisuka, Andreas Brunthaler, Karl M. Menten, Mark J. Reid, Hiroshi Imai, Yoshiaki Hagiwara, Makoto Miyoshi, Shinji Horiuchi, Tetsuo Sasao .  WATER MASER MOTIONS IN W3(OH) AND A DETERMINATION OF ITS DISTANCE .  Astrophysical Journal645 ( 1 ) 337 - 344   2006.4Reviewed

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  • Wouter H. T. Vlemmings, Philip J. Diamond, Hiroshi Imai .  A magnetically collimated jet from an evolved star .  Nature440   58 - 60   2006.3Reviewed

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  • Mareki Honma, Takeshi Bushimata, Yoon Kyung Choi, Takahiro Fujii, Tomoya Hirota, Koji Horiai, Hiroshi Imai, Noritomo Inomata, Jose Ishitsuka, Kenzaburo Iwadate, Takaaki Jike, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-Ya, Noriyuki Kawaguchi, Masachika Kijima, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Takeshi Miyaji, Akiharu Nakagawa, Kouichirou Nakashima, Chung Sik Oh, Toshihiro Omodaka, Tomoaki Oyama, Maria Rioja, Satoshi Sakai, katsuhisa Sato, Tetsuo Sasao, Katsunori M. Shibata, Rie Shimizu, Kasumi Sora, Hiroshi Suda, Yoshiaki Tamura, Kazuyoshi Yamashita .  Multi-Epoch VERA Observations of OH43.8-0.1 .  Publications of the Astronomical Society of Japan57 ( 4 ) 595 - 603   2005.8Reviewed

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  • Hiroshi Imai, Jun-ichi Nakashima, Philip J. Diamond, SHuji Deguchi, Atsushi Miyazaki .  A BICONICALLY EXPANDING FLOW IN W43A TRACED BY SiO MASER EMISSION .  Astrophysical Journal622 ( 1 ) L125 - L128   2005.4Reviewed

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  • Hiroshi Imai, Anuj Sarma .  THE KINEMATICS, PHYSICAL CONDITION AND MAGNETIC FIELD OF THE W3 IRS5 REGION .  Dense Molecular Gas Around Protostars and in Galactic Nuclei, Springer295   271 - 274   2005.3Reviewed

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  • Shuji Deguchi, Takahiro Fujii, Ian S. Glass, Hiroshi Imai, Yoshifusa Ita, Hideyuki Izumiura, Osamu Kameya, Atsushi Miyazaki, Yoshikazu Nakada, Jun-ichi Nakashima .  SiO Maser Survey of IRAS Sources in the Inner Galactic Disk .  Publicaitons of the Astronomical Society of Japan56 ( 5 ) 765 - 802   2004.10Reviewed

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  • Hiroshi ImaiI, Mark Morris, Raghvendra Sahai, Kazuya Hachisuka, Jose Ruyman Azollini Fellipe .  The kinematics of water masers in the stellar outflow source, IRAS 19134+2131 .  Astronomy and Astrophysics European Journal420 ( 1 ) 265 - 271   2004.5Reviewed

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  • Shuji Deguchi, Hiroshi Imai, Takahiro Fujii, Ian S. Glass, Yoshifusa Ita, Hideyuki Izumiura, Osamu Kameya, Atsushi Miyazaki, Yoshikazu Nakada, Jun-ichi Nakashima .  SiO Maser Survey of the Large-Amplitude Variables in the Galactic Center .  Publicaitons of the Astronomical Society of Japan56 ( 3 ) 261 - 294   2004.4Reviewed

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  • Mareki Honma, Yoon Kyung Choi, Takechi Bushimata, Takahiro Fujii, Tomoya Hirota, Koji Horiai, Hiroshi Imai, Noritomo Inomata, Jose Ishitsuka, Kenzaburo Iwadate, Takaaki Jike, Osamu Kameya, Ryuichi Kamohara, Yukitoshi Kan-Ya, Noriyuki Kawaguchi, Hideyuki Kobayashi, Seisuke Kuji, Tomoharu Kurayama, Seiji Manabe, Takeshi Miyaji, Akiharu Nakagawa, Kouichirou Nakashima, Riiko Nagayoshi, Toshihiro Omodaka, Tomoaki Oyama, Maria Rioja, Satoshi Sakai, Sei-ichiro Sakakibara, Katsuhisa Sato, Tetsuo Sasao, Katsunori M. Shibata, Rie Shimizu, Kasumi Sora, Hiroshi Suda, Yoshiaki Tamura, Kazuyoshi Yamashita .  VERA Observation of the W49N H2O Maser Outburst in 2003 October .  Publicaitons of the Astronomical Society of Japan56 ( 1 ) L15 - L18   2004.1Reviewed

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

  • Imai, H., Horiuchi S., Deguchi S., Kameya O. .  LINEAR POLARIZATION OBSERVATIONS OF WATER MASERS IN W3 IRS 5 .  The Astrophysical Journal595   285 - 293   2003Reviewed

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

    Institutional Repository URL

  • Imai, H., Shibata K.M., Marvel, K.B., Diamond P.J., Sasao T., Miyoshi M., Inoue M., Migenes V., Murata Y. .  THE THREE-DIMENSIONAL KINEMATICS OF WATER MASERS AROUND THE SEMIREGULAR VARIABLE RT VIRGINIS .  The Astrophysical Journal590   460 - 472   2003Reviewed

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

  • Imai, H., Watanabe T., Omodaka, T., Nishio M., Kameya O., Miyaji T., Nakajima J. .  3-D Kinematics of Water Masers in the W51A Region .  Publications of the Astronomical Society of Japan54 ( 5 ) 741 - 755   2002.10Reviewed

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

  • Imai, H., Obara K., Diamond P.J., Omodaka T., Sasao T. .  A collimated jet of molecular gas from a star on the asymptotic-giant-branch .  Nature417   829 - 831   2002.6Reviewed

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

  • Imai, H., Deguchi S., Fujii T., Glass I. S., Ita Y., Izumiura H., Kameya O., Miyazaki A., Nakada Y., Nakashima J. .  Detection of SiO Masers from the Large-Amplitude Variables in the Galactic Nuclear Disk .  Publications of the Astronomical Society of Japan54 ( 2 ) L19 - L23   2002.4Reviewed

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

  • Imai, H., Deguchi S., Sasao T. .  MICROSTRUCTURE OF WATER MASERS IN W3 IRS 5 .  The Astrophysical Journal567   971 - 979   2002.3Reviewed

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

  • Ishitsuka J. K., Imai, H., Omodaka T., Ueno M., Kameya O., Sasao T., Morimoto M., Miyaji T., Nakajima J., Watanabe T. .  VLBI Monitoring Observations of Water Masers around the Semi-Regular Variable Star R Crateris .  Publications of the Astronomical Society of Japan53 ( 6 ) 1231 - 1238   2001.12Reviewed

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

  • Sudou H, Omodaka T., Imai, H., Sasao T., Takaba H., Nishio M., Hasegawa W., Nakajima J. .  VLBI Observations of Water Masers in the Circumstellar Envelope of IRC +60169 .  Publications of the Astronomical Society of Japan54 ( 5 ) 757 - 764   2001.10Reviewed

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

  • Imai, H., Ishihara Y., Kameya O., Nakai N. .  Water Maser Survey in the Andromeda Galaxy .  Publications of the Astronomical Society of Japan53 ( 3 ) 489 - 493   2001Reviewed

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

  • Imai Hiroshi, et al. .  Snapshot VLBI observations of SiO v=1 and v=2 (J=1--0) Maser Sources .  Publications of the Astronomical Society of Japan53 ( 2 ) 259 - 273   2001Reviewed

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

  • Honma M., Oyama T., Hachisuka K., Sawada S. S., Sebata K., Miyoshi M., Kameya O., Manabe S., Kawaguchi N., Sasao T., Kameno S., Fujisawa K., Shibata K. M., Bushimata T., Miyaji T., Kobayashi H., Inoue M., Imai, H., et al. .  J-Net Galactic Plane Survey of VLBI Radio Sources .  Publications of the Astronomical Society of Japan52 ( 5 ) 631 - 643   2000.10Reviewed

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

  • Hiroshi Imai, et al. .  KINEMATICS AND DISTANCE OF WATER MASERS IN W3 IRS5 .  The Astrophysical Journal538   751 - 765   2000Reviewed

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

  • Hiroshi Imai .  Internal Motions and Fine Structure of Astronomical Masers -- Application to Stellar Astrophysics and High Precision Astrometry -- .      1999.3

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    Language：English   Publishing type：Doctoral thesis  

  • Imai, H., Deguchi S., Miyoshi M. .  VLBA Observation of SiO Masers in the M Giant IRC-10414 .  Publications of the Astronomical Society of Japan51 ( 5 ) 587 - 593   1999Reviewed

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

  • Imai, H., Iwata T., Miyoshi M. .  Rotation-Infall Motion around the Protostar IRAS16293-2422 .  Publications of the Astronomical Society of Japan51 ( 4 ) 473 - 477   1999Reviewed

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

  • Imai Hiroshi, et al. .  Measurement of shifts in line-of-sight velocities of stellar water masers using VLBI .  Astronomy and Astrophisics319   L1 - L4   1997.9Reviewed

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

  • Imai Hiroshi, et al. .  Detection of compact water maser spots around late-type stars .  Astronomy and Astrophisics317   L67 - L70   1997.7Reviewed

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

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Books

MISC

  • Frontier of global collaboration: case of astrophysics Invited Reviewed

    IMAI, Hiroshi

    Journal of Japanese Scientists   59 ( 5 )   41 - 43   2024.5

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    Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)  

  • VLBI Achieving the Highest Resolution Invited Reviewed

    IMAI, Hiroshi

    Journal of Japanese Scientist   58 ( 7 )   33 - 38   2023.7

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    Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

  • 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

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  • 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

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  • 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

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  • VERAによる宇宙メーザー励起機構の研究 Reviewed

    今井　裕

    天文月報   1016 ( 6 )   408 - 417   2013

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    Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：日本天文学会  

  • VLBA問題 Reviewed

    今井　裕

    天文月報   101 ( 6 )   344 - 350   2008

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本天文学会  

  • 恒星の進化と宇宙水蒸気メーザー Reviewed

    今井　裕

    日本の科学者   41 ( 2 )   40 - 44   2006

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本科学者会議  

  • 年老いた星からの「噴水」：AGB星からの分子ガスジェットの発見 Reviewed

    今井　裕

    天文月報   95 ( 12 )   589 - 595   2002

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：日本天文学会  

  • 恒星の進化と水メーザー

    今井　裕

    鹿島宇宙通信センター宇宙電波観測用大型アンテナ成果報告   47   31 - 39   2001

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    Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：通信総合研究所  

  • 水蒸気メーザー源のVLBI観測その２: 星形成フローの三次元運動を眺める

    今井　裕

    天文月報   93 ( 6 )   307 - 312   2000

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本天文学会  

  • 当事者から眺めたPD・OD問題 Reviewed

    今井　裕

    天文月報   93 ( 2 )   93 - 98   2000

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    Language：Japanese   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：日本天文学会  

  • 水蒸気メーザー源のVLBI観測：太陽系スケール原始星周辺ガス回転降着運動 Reviewed

    今井　裕

    天文月報   93 ( 1 )   16 - 23   2000

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：日本天文学会  

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Presentations

  • IMAI, Hiroshi   VLBI Experiments with an OCXO installed in Nobeyama 45 m radio telescope  

    Astronomical Socieity of of Japan Autumn Meeting  2024.9  Astronomical Society of Japan

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    Event date： 2024.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：Sanda, Hyogo   Country：Japan  

  • IMAI, Hiroshi   A digital-spectroscopy-type water vapor radiometer for high accuracy radio astrometry   International conference

    32th International Astronomical Union General Assembly Focus Meeting 11  2024.8  International Astronomical Union

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    Event date： 2024.8

    Language：English   Presentation type：Poster presentation  

    Venue：Cape Town   Country：South Africa  

  • IMAI, Hiroshi   Five-year Summaru of FLASHING   International coauthorship

    Autumn Meeting of the Astronomical Society of Japan  2023.9  Astronomical Society of Japan

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：Nagoya   Country：Japan  

  • IMAI, Hiroshi   HINOTORI and its perspectives   International conference

    URSI General Assemby and Science Symposium  2023.8  International Union of Radio Science

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    Event date： 2023.8

    Language：English   Presentation type：Poster presentation  

    Venue：Sappro   Country：Japan  

  • IMAI, Hiroshi   ESTEMA   International coauthorship

    Asian-Pacific IAU Regional Meeting 2023  2023.8 

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    Event date： 2023.8

    Language：English   Presentation type：Poster presentation  

    Venue：Koriyama   Country：Japan  

  • IMAI Hiroshi   Water fountain sources monitored in FLASHING   International coauthorship International conference

    IAU Symposium 380 Cosmic Masers  2023.3  IAU Symposium Organizing Committee

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    Event date： 2023.3

    Language：English   Presentation type：Oral presentation (general)  

    Venue：ライカ南国ホール（鹿児島市）   Country：Japan  

  • 今井　裕   天の川銀河中心部に対する高精度電波アストロメトリ  

    SKA Japanワークショップ2022  2023.3 

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    Event date： 2023.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：国立天文台三鷹キャンパス   Country：Japan  

  • 今井　裕   HINOTORI Status Report  

    2022年度宇宙電波懇談会シンポジウム 「2030年代の電波天文学」  2022.12  VLBI懇談会

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    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東北大学  

  • 今井　裕   天の川銀河中心部に対するVERAアストロメトリ  

    2022年度宇宙電波懇談会シンポジウム 「2030年代の電波天文学」  2022.12  VLBI懇談会

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    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東北大学   Country：Japan  

  • IMAI Hiroshi   Scientific operation of the HINOTORI system   International conference

    ALMA/ASTE/NRO Users Meeting  2022.12  国立天文台東アジアアルマ地域センター

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    Event date： 2022.12

    Language：English   Presentation type：Oral presentation (general)  

    Venue：国立天文台三鷹キャンパス  

  • 今井　裕   HINOTORI システムによる星周メーザー源モニター観測  

    2022年度連星・変光星研究会  2022.12 

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    Event date： 2022.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：岡山理科大学   Country：Japan  

  • IMAI Hiroshi   Double-/triple-bands simultaneous observation system with perforated dichroic filter plates equipped for the Nobeyama 45 m radio telescope   International conference

    アジアー太平洋マイクロ波会議2022  2022.12 

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    Event date： 2022.11 - 2022.12

    Language：English   Presentation type：Oral presentation (general)  

    Venue：パシフィコ横浜   Country：Japan  

  • 今井　裕   HINOTORI (Hybrid Integration Project in Nobeyama, Triple-band Oriented) 進捗報告  

    日本天文学会秋季年会  2022.9  日本天文学会

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    Event date： 2022.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：新潟大学   Country：Japan  

  • 今井　裕   銀河系中心電波源astrometry に基づく JASMINE との連携計画  

    日本天文学会秋季年会  2022.9 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：新潟大学   Country：Japan  

  • 氏原秀樹   次世代マイクロ波放射計兼広帯域VLBI 受信システムの開発(III)  

    日本天文学会秋季年会  2022.9  日本天文学会

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：新潟大学   Country：Japan  

  • HINOTORI, FLASHING, and ESTEMA   International coauthorship

    2022.3 

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    Event date： 2022.3

    Language：English   Presentation type：Poster presentation  

  • 氏原秀樹, 市川隆一, 関戸衛, 宗包浩志, 宮原伐折羅, 小林知勝, 寺家孝明, 小山友明, 竹内央, 今井裕   次世代マイクロ波放射計兼広帯域VLBI 受信システムの開発(II)  

    日本天文学会2022年春季年会  2022.3  日本天文学会

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    Event date： 2022.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：広島大学（オンライン）  

  • 小山友明、鈴木駿策、河野祐介、山内彩、寺家孝明、秦和弘、亀谷收、萩原喜昭、今井裕、他KaVA, EAVN メンバー   VERA-upgrade for EAVN and GVLBI 計画の進捗V  

    日本天文学会2022年春季年会  2022.3  日本天文学会

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    Event date： 2022.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：広島大学（オンライン）  

  • IMAI Hiroshi   HINOTORI toward VLBI in the SKA era   International conference

    VLBI in the SKA Era  2022.2  SKA Observatory, ICRAR, CSIRO

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    Event date： 2022.2

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Perth   Country：Australia  

  • ESTEMA (EAVN Synthesis of Stellar Maser Animations)   International coauthorship

    2022.1 

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    Event date： 2022.1

    Language：Japanese   Presentation type：Oral presentation (general)  

  • IMAI Hiroshi   HINOTORI Status Report 2021   International conference

    ALMA/45m/ASTE Users Meeting FY2021  2021.12 

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    Event date： 2021.12

    Language：English   Presentation type：Poster presentation  

  • 甘田 渓, 今井 裕, 濱江勇希, 中島圭佑, 沈 嘉耀, Daniel Tafoya, Lucero Uscanga, Jos ́e Francisco G ́omez, Garbor Orosz, Ross Burns   新SiOメーザー検出が示唆する「宇宙の噴水」天体の進化急速進行   International coauthorship

    日本天文学会2021年秋季年会  2021.9  日本天文学会

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都産業大学（オンライン）  

  • 氏原秀樹, 市川隆一, 関戸衛, 宗包浩志, 宮原伐折羅, 小林知勝, 寺家孝明, 小山友明, 竹内央, 今井裕   次世代マイクロ波放射計兼広帯域VLBI 受信システムの開発(I)  

    日本天文学会2021年秋季年会  2021.9  日本天文学会

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都産業大学（オンライン）  

  • 今井　裕   高感度ミリ波ＶＬＢＩ撮像による星間分子ガス中の超微細空間構造の探求  

    新学術領域「星惑星形成」 後半戦キックオフミーティング   2021.7  新学術領域「星惑星形成」

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    Event date： 2021.7

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名古屋大学  

  • Hideki UJIHARA, Shinsuke SATOH, Yusaku OHTA, Basara MIYAHARA, Hiroshi MUNEKANE, Tomokazu KOBAYASHI, Takeshi NAGASAKI, Osamu TAJIMA, Kentaro ARAKI, Takuya TAJIRI, Takeshi MATSUSHIMA, Hiroshi TAKIGUCHI, Nobuo MATSUSHIMA, Tatsuya MOMOTANI, Kenji UTSUNOMIYA, Mamoru SEKIDO, Takaaki JIKE, Tomoaki OYAMA, Hiroshi TAKEUCHI, Hiroshi IMAI   Development of Wideband Receiver for Novel Ground-based Microwave Radiometer -field experiments of the new 20-60 GHz wide-band receiver and its implications to new development of the wide-band VLBI receiver -   International conference

    Scientific Assembly of the International Association of Geodesy 2021  2021.6  International Association of Geodesy

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    Event date： 2021.6 - 2021.7

    Language：English   Presentation type：Poster presentation  

  • IMAI Hiroshi, FLASHING Team   FLASHING (Finest Legacy Acquisitions of H2O-/SiO-maser Ignitions by Nobeyama Generation)   International conference

    East Asian VLBI Workshop 2021 

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    Event date： 2021.3

    Language：English   Presentation type：Oral presentation (general)  

    Venue：タイ（オンライン開催）  

  • 甘田渓, 今井 裕, NESS Team   NESS (Nearby Evolved Stars Survey)で観測された冷たいAGB星周縁の統計的性質  

    連星・変光星研究会2020 

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    Event date： 2021.1

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都大学（オンライン）  

  • 濱江勇希, 今井 裕, 甘田 渓, FLASHING Team   FLASHING (Finest Legacy Acquisitions of H2O-/SiO-maser Ignitions by Nobeyama Generation)  

    連星・変光星研究会2020 

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    Event date： 2021.1

    Language：Japanese   Presentation type：Poster presentation  

  • IMAI Hiroshi, et al.   FLASHING (Finest Legacy Acquisitions of H2O-/SiO-maser Ignitions by Nobeyama Generation)  

    ALMA/ASTE/NRO Users Meeting 

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    Event date： 2021.1

    Language：English   Presentation type：Poster presentation  

  • TSUTSUMI Toshihisa, NIINUMA Kotaro, IMAI Hiroshi, et al.   Construction and test observation of a simultaneous 3-band VLBI observing system on the Nobeyama 45-m telescope  

    ALMA/45m/ASTE Users Meeting FY2020  EA-ARC

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    Event date： 2021.1

    Language：English   Presentation type：Poster presentation  

  • AMADA Kei, IMAI Hiroshi, NESS Team   Statistical properties of cold circumstellar envelops observed in NESS(Nearby Evolved Stars Survey)  

    ALMA/45m/ASTE Users Meeting FY2020  EA-ARC

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    Event date： 2021.1

    Language：English   Presentation type：Poster presentation  

    Venue：国立天文台三鷹キャンパス（オンライン）  

  • Hiroshi Imai   ESTEMA, HINOTORI, and FLASHING   Invited

    Nobeyama Science Workshop 2020 

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    Event date： 2020.9

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

  • 今井裕, 濱江勇希, 甘田渓, FLASHINGチーム   ミラ型変光星かんむり座S 星の星周縁における衝撃波伝播パターンの発見  

    日本天文学会2020年秋季年会 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 甘利涼湖, 堤稔喜, 藤澤健太, 新沼浩太郎, 青木貴弘, 澤田-佐藤聡子, 今井裕, 小川英夫, 西村淳, 岡田望, 上田翔汰, 高嶋辰幸, 増井翔, 近藤滉, 松本健, 鳥居和史, 宮 澤千栄子, 金子紘之   野辺山45 m電波望遠鏡における3帯域同時観測に向けたTZ受信機の改修  

    日本天文学会2020年秋春年会  日本天文学会

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    Event date： 2020.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：筑波大学  

  • 今井 裕, 宇野友理, 前山大地, 山口諒祐, 甘田 渓, 濱江勇希, Ross Burns, Gabor Orosz   『宇宙の間欠泉』から新たに出現した双極高速ジェットからの同時噴出ガス塊  

    連星系・変光星研究会2019 

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    Event date： 2019.11 - 2019.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：中京大学  

  • 今井 裕, 宇野友理, 前山大地, 山口諒祐, 甘田 渓, 濱江勇希, Ross Burns, Gabor Orosz   『宇宙の間欠泉』から新たに出現した双極高速ジェットからの同時噴出ガス塊  

    VLBI懇談会シンポジウム2019 

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    Event date： 2019.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：中京大学  

  • IMAI Hiroshi   Current progress in ESTEMA and relevant EAVN commissioning   Invited International conference

    12th East Asian VLBI Workshop 

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    Event date： 2019.9

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

  • 今井 裕, 宇野友理, 前山大地, 山口諒祐, 甘田 渓, 濱江勇希, Ross Burns, Gabor Orosz, Jos ?e Francisco Go ?mez, Daniel Tafoya, Lucero Uscanga   「宇宙の間欠泉」から新たに出現した双極高速ジェットからの同時噴出ガス塊  

    日本天文学会2019年秋季年会  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  

  • 岳藤一宏, 米倉覚則, 齋藤悠, 青木貴弘, 藤澤健太, 杉山孝一郎, 今井裕   拡張相互相関分光法による 6.7GHz メタノールメーザー解析  

    日本天文学会2019年秋季年会  日本天文学会

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    Event date： 2019.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：熊本大学  

  • 甘田渓, 深谷紗希子, 今井裕, 新永浩子, Peter Scicluna, Naomi Hirano, Francisca Kemper, Sundar Srinivasan, Sofia Wallstrom, Thavisha Dharmawardena, NESS Team   野辺山 45m 電波望遠鏡を使った AGB 星周縁の 12CO, 13CO 輝線の撮像  

    日本天文学会2019年秋季年会  日本天文学会

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    Event date： 2019.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：熊本大学  

  • 今井　裕   HINOTORI and its Early Single-dish Science   Invited

    Nobeyama Science Workshop -令和元年- 

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    Event date： 2019.9

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

  • 今井 裕   電波アストロメトリの将来を考察する   Invited

    SKA-Japanシンポジウム 2019 

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    Event date： 2019.9

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

    Venue：国立天文台三鷹キャンパス  

  • H. Imai, H. Shinnaga, S.Sawada-Satoh, D. Maeyama, Y. Uno, A. Nakagawa, K. Niinuma, T. Aoki, T. Tsutsumi, K. Fujisawa, H. Ogawa, T. Manabe, N. Okada, K. Kimura, M. Chiba, I. Hashimoto, D. Yasuda, T. Ohnishi, T. Oyama, Y. Kono, N. Sakai, T. Hirota, Y. Tamura, K.M. Shibata, K. Sunada, M. Honma (Mizusawa, NAOJ), T. Minamidani, Y. Miyamoto, K. Miyazawa, C. Miyazawa、Y. Asaki, S. Kameno, Y. Yonekura, K. Takefuji   HINOTORI Status in 2018  

    ALMA/ASTE/NRO Users Meeting 

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    Event date： 2018.12

    Language：English   Presentation type：Poster presentation  

  • 今井　裕, Daniel Tafoya, 中島淳一, Gabor Orosz, Bosco Yung, Jos ?e-Francisco Gom ?ez   W43A: AGB星縁を数10年間で 高速双極ジェットが ぶち抜いていく様子  

    連星・変光星・低温度星研究会 

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    Event date： 2018.12

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 今井　裕, Daniel Tafoya, 中島淳一, Gabor Orosz, Bosco Yung, Jos ?e-Francisco Gom ?ez   W43A: Shaping the envelope of an AGB star with a collimated jet  

    VLBI懇談会シンポジウム2018 

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    Event date： 2018.12

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 岡田 望 , 橋本 育実 , 保田 大介 , 木村 公洋 , 千葉 正克 , 真鍋 武嗣 , 大西 利和 , 小川 英夫, 南谷 哲宏 , 宮本 祐介, 宮澤 和 彦, 宮澤 千栄子, 小山 友明, 澤田-佐藤 聡子, 岸本 直子, 前山 大地 , 今井 裕   22/43 GHz帯フィルタによる野辺山45 m鏡二周波同時観測について -フィルタ開発からコミッショニング観測まで-  

    VLBI懇談会シンポジウム2018 

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    Event date： 2018.12

    Language：Japanese   Presentation type：Poster presentation  

  • 今井　裕   HINOTORIと3 mm 帯VLBI観測で目指すもの   Invited

    薩長同盟天文学研究会 

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    Event date： 2018.10

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 木村公洋, 岡田望, 橋本育実, 小川英夫, 真鍋武嗣, 今井裕   22/43GHz 帯分離および43/86GHz 帯分離 Perforated Plate 型周波数フィルター の開発評価  

    日本天文学会秋季年会 

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    Event date： 2018.9 - 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • 岡田 望, 橋本 育実, 保田 大介, 木村 公洋, 千葉 正克, 真鍋 武嗣, 大西 利和, 小川 英夫, 南谷 哲宏, 宮本 祐介, 宮澤 和彦, 宮澤 千栄子, 小山 友明, 澤田-佐藤 聡子, 岸本 直子, 前山 大地, 今井 裕   野辺山45m電波望遠鏡における 22/43 GHz 帯同時観測評価  

    日本天文学会秋季年会 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

  • Hiroshi Imai 他   Status Reports on EAVN Evolved Stars Science Working Group and ESTEMA   International conference

    East Asia VLBI Workshop 

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    Event date： 2018.9

    Language：English   Presentation type：Oral presentation (general)  

  • Hiroshi Imai   Exploration of extended circmstelar matter around dying stars   Invited International conference

    NOEMA/IRAM30m Workshop 

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    Event date： 2018.7

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

  • 今井　裕   SKA-VLBI Concept   Invited

    SKA時代のVLBIサイエンス 

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    Event date： 2018.7

    Language：Japanese   Presentation type：Oral presentation (keynote)  

  • Hiroshi Imai   Towards decadal continuous viewing of circumstellar maser sources   Invited International conference

    Internationa Astronomical Union Symposium 336  Internationa Astronomical Union

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    Event date： 2017.9

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

    Venue：Cagriali  

  • Miyako Oyadomari, Hiroshi Imai,   Correlation of the relative SiO maser distributions with the stellar light curves   International conference

    13th European VLBI Network Meeting 

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    Event date： 2016.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue： St. Petersburg Scientific Center  

  • Gabor Orosz, Hiroshi Imai, Richard Dodson, Maria Rioja, Dieter Engeles, Sandra Etoka, Sandor Frey   MultiView ? a pilot study for precise VLBI astrometry at low frequencies using multiple calibrators   International conference

    13th European VLBI Network Meeting 

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    Event date： 2016.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue： St. Petersburg Scientific Center  

  • "Hiroshi Imai, Tomoaki Oyama, Yusuke Kono, Tomoya Hirota, Takumi Nagayama, Syunsaki Suzuki, Masahiro Kanaguchi, Takashi Nishikawa, Noriyuki Kawaguchi, Hideyuki, Kobayashi (National Astronomical Observatory of Japan) Miyako Oyadomari, Sho Kuwahara, Amane Kano, Sze-Ning Chong"   Wide-band VLBI observations of multiple SiO maser lines using the OCTAVE system   International conference

    Asia-Pacific Radio Science Conference 2016 

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    Event date： 2016.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Hotel Hilton Seoul  

  • "Hiroshi Imai, Tomoaki Oyama, Yusuke Kono, Tomoya Hirota, Takumi Nagayama, Syunsaki Suzuki, Masahiro Kanaguchi, Takashi Nishikawa, Noriyuki Kawaguchi, Hideyuki, Kobayashi (National Astronomical Observatory of Japan) Miyako Oyadomari, Sho Kuwahara, Amane Kano, Sze-Ning Chong"   Radio Astrometry towards the Nearby Universe with the Square Kilometre Array   Invited International conference

    Asia-Pacific Radio Science Conference 2016 

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    Event date： 2016.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Center of Interdisciplinary Science Education  

  • Hiroshi Imai   "VLBI observations of circumstellar maser sources for exploration of stellar pulsation-driven shock waves "   International conference

    Blowing in the wind, Rencontres du Vietnam 

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    Event date： 2016.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Center of Interdisciplinary Science Education  

  • Gabor Orosz, Hiroshi Imai, Daniel Tafoya, Jose Francisco Gomez, Olga Suarez, Ricardo Rizzo, Andres Perez Sanchez, Steve Goldman, Ross Burns   Water fountain jets as seen by VLBI maser astrometry   International conference

    SCHOCKS2016 Conference 

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    Event date： 2016.8

    Language：English   Presentation type：Oral presentation (general)  

  • Gabor Orosz, Hiroshi Imai, Daniel Tafoya, Jose Francisco Gomez, Olga Suarez, Ricardo Rizzo, Andres Perez Sanchez, Steve Goldman, Ross Burns   Water fountain jets as seen by VLBI maser astrometry   International conference

    Blowing in the wind, Rencontres du Vietnam 

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    Event date： 2016.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：International Center of Interdisciplinary Science Education  

  • Hiroshi Imai, SKA-JP Astrometry Science Working Group   Planning VLBI in the SKA era   Invited International conference

    Astronomy Development in Vietnam, Challenges and Opportunities 

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    Event date： 2016.7 - 2016.8

    Language：English   Presentation type：Oral presentation (general)  

    Venue：クイニョン、ベトナム  

  • Hiroshi Imai, SKA-JP Astrometry Science Working Group   Science drivers for low frequency astrometry   International conference

    Joint Australian and Japanese SKA Astrometry Schools  

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    Event date： 2016.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：タスマニア大学  

  • Gabor Orosz, Hiroshi Imai, Richard Dodson, Maria Rioja, Dieter Engeles, Sandra Etoka, Sandor Frey   Multi-calibrator methods for astrometric VLBI   International conference

    Joint Australian and Japanese SKA Astrometry Schools  

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    Event date： 2016.6

    Language：English   Presentation type：Oral presentation (general)  

    Venue：タスマニア大学  

  • 今井 裕、Joanne Dawson、Andrew Walsh、SPLASHチーム   SPLASH によるOHメーザー源探査の初期成果  

    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： 2014.9

    Language：Japanese  

    Venue：山形  

    国内学会

  • Se-Hyung Cho, Hiroshi Imai, KaVA Evolved Stars sub-Working Group   Planning Large Programs of Stellar Maser Studies with KaVA   International conference

    12th Asia-Pacific Regional IAU Meeting  12th Asia-Pacific Regional IAU Meeting

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    Event date： 2014.8

    Language：English  

    Venue：韓国  

    国際学会

  • Hiroshi Imai   OH maser astrometry with the SKA   International conference

    Transformational Science with the SKA  Transformational Science with the SKA

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    Event date： 2014.2

    Language：English  

    Venue：南アフリカ  

    国際学会

  • Hiroshi Imai, Miyako Oyadomari, Se-Hyung Cho, Young-Joo Yun, Kozue Kusuno, Yoshiharu Asaki, Naoko Matsumoto, KVN+VERA Evolved Stars sub-Working Group   Imaging demonstration of stellar masers with KVN+VERA  

    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： 2013.9

    Language：Japanese  

    Venue：宮城県  

    国内学会

  • Hiroshi Imai   Towards Maser Source Astrometry with the SKA   International conference

    Asian-Pacific Radio Science Conference 2013  Asian-Pacific Radio Science Conference 2013

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    Event date： 2013.9

    Language：English  

    Venue：台湾  

    国際学会

  • 今井 裕, 中島淳一, 郭 新, Bosco Yung, 出口修至   「宇宙の噴水」に見られるAGB星フローまたは「赤道流」  

    日本天文学会春季年会  日本天文学会春季年会

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    Event date： 2013.3

    Language：Japanese  

    Venue：埼玉  

    国内学会

  • 今井 裕   GASKAPに向けたメーザー源同定シミュレーションその１  

    日本天文学会春季年会  日本天文学会春季年会

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    Event date： 2013.3

    Language：Japanese  

    Venue：埼玉  

    国内学会

  • 今井　裕   HINOTORI進捗報告  

    2021年度VLBI懇談会シンポジウム  2021.12  VLBI懇談会

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    Event date： 2012.12 - 2021.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：国立天文台三鷹キャンパス  

  • Hiroshi Imai   Water fountains: bipolar fast stellar jets traced by water vapor maser emission   International conference

    International Astronomical Union Symposium 290 - Accretion on all scales  International Astronomical Union Symposium 290 - Accretion on all scales

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    Event date： 2012.8

    Language：English  

    Venue：中国  

    国際学会

  • Hiroshi Imai, VERA collaboration   Astrometry of H_2O masers in post-AGB stars   International conference

    International Astronomical Union Symposium 287 - Cosmicl Masers: From OH to H_0  International Astronomical Union Symposium 287 - Cosmicl Masers: From OH to H_0

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    Event date： 2012.1

    Language：English  

    Venue：南アフリカ  

    国際学会

  • 今井裕、荘思寧、中島淳一、Chih-Hao Hsia、出口修至、酒井剛、 Jin-Hua He、Nico Koning   「宇宙の噴水」天体 IRAS 16342-3814 で見つかった極端に低い 12CO/13 CO (J = 3-2) 輝線強度比  

    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： 2011.9

    Language：Japanese  

    Venue：鹿児島  

    国内学会

  • 今井裕、VERA チーム   「宇宙の噴水」天体 IRAS 18286-0959 の年周視差距離と銀河系内運動  

    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： 2011.9

    Language：Japanese  

    Venue：鹿児島  

    国内学会

  • Hiroshi Imai, Daniel Tafoya, and VERA collaboration   Trigonometric parallax measurements of post-AGB stars with VERA   International conference

    International Astronomical Union Symposium 283 - Planetary Nebulae: An Eye to the Future  International Astronomical Union Symposium 283 - Planetary Nebulae: An Eye to the Future

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    Event date： 2011.7

    Language：English  

    Venue：スペイン  

    国際学会

  • Hiroshi Imai   Astrometry from VERA to SKA  

    Square Kilometer Array Japan Workshop 2010  Square Kilometer Array Japan Workshop 2010

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    Event date： 2010.11

    Language：Japanese  

    Venue：東京  

    研究会

  • Hiroshi Imai   Stellar Maser Astrophysics Explored with the East Asian VLBI Network   International conference

    8th East Asian Meeting on Astronomy  8th East Asian Meeting on Astronomy

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    Event date： 2010.10

    Language：English  

    Venue：中国  

    国際学会

  • Hiroshi Imai   VLBI Mapping of Multiple Maser Lines with the East Asia VLBI Network   International conference

    Asian-Pacific Radio Science Conference 2010  Asian-Pacific Radio Science Conference 2010

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    Event date： 2010.9

    Language：English  

    Venue：富山  

    国際学会

  • Hiroshi Imai, John Dickey, Steven Gibson, Jose Francisco G´omez, Paul Jones, Naomi M. McClure-Griffiths, Jacco van Loon, and Snezana Stannimirovi'c   GASKAP: The Galactic Australian SKA Path?nder Survey   International conference

    Asian-Pacific Radio Science Conference 2010  Asian-Pacific Radio Science Conference 2010

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    Event date： 2010.9

    Language：English  

    Venue：富山  

    国際学会

  • Hiroshi Imai, Jun-ichi Nakashima, Shuji DeguchiAkiharu Nakagawa, Takumi NagayamaAya Yamauchi   JVN mapping of multi-transitions of SiO J=1―0 maser emission   International conference

    East-Asia VLBI Network Workshop 2010  East-Asia VLBI Network Workshop 2010

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    Event date： 2010.4

    Language：English  

    Venue：鹿児島  

    国際学会

  • 今井 裕、 VERA プロジェクトチーム   惑星状星雲 K3-35 に付随する水メーザー源の年周視差計測   International conference

    日本天文学会春季年会  日本天文学会春季年会

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    Event date： 2010.3

    Language：English  

    Venue：広島  

    国際学会

  • 今井裕、出口修至、中川亜紀治、永山匠、山内 彩   一酸化珪素メーザー v=3 J=1-0 輝線のVLBIによる初撮像  

    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： 2009.9

    Language：Japanese  

    Venue：山口  

    国内学会

  • 今井 裕、Jin-Hua He, 中島淳一、出口修至   「宇宙の噴水」天体からのCO J=3-2輝線の検出  

    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： 2008.9

    Language：Japanese  

    Venue：岡山  

    国内学会

  • Hiroshi Imai   OH maser envelopes of the "water fountain" sources  

    9th European VLBI Network Symposium  9th European VLBI Network Symposium

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    Event date： 2008.9

    Language：Japanese  

    Venue：イタリア  

    研究会

  • Hiroshi Imai   Stellar molecular jets traced by maser emission  

    Approaching Micro-Arcsecond Resolutino with VSOP-2: Astrophysics and Technology  Approaching Micro-Arcsecond Resolutino with VSOP-2: Astrophysics and Technology

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    Event date： 2007.12

    Language：Japanese  

    Venue：神奈川  

    研究会

  • Hiroshi Imai, Raghvendra Sahai, Mark Morris   Distance and kinematics of IRAS 19134+2131 revealed by H2O maser observations   International conference

    International Astronomical Union Symposium 248: A Giant Step from Milli- to Micro-arcsecond Astrometry  International Astronomical Union Symposium 248: A Giant Step from Milli- to Micro-arcsecond Astrometry

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    Event date： 2007.10

    Language：English  

    Venue：中国  

    国際学会

▼display all

Awards

  • 国際会議誘致・開催貢献賞　国際会議誘致の部　特別賞

    2023.2   日本政府観光局  

    国際天文学連合シンポジウム開催実行委員会

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    Award type：Award from publisher, newspaper, foundation, etc.  Country：Japan

    宇宙研究と関係の深い鹿児島を強調することで、意義深く効果的な計画・誘致活動が達成されたこと が評価された。若手研究者のみならず市民向けの講演会や電波天文観測実習が計画されていることも ユニークな評価を受けるポイントとなった。

  • The PASJ Excellent Paper Award 2014

    2015.3   The Astronomical Society of Japan  

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    Award type：Honored in official journal of a scientific society, scientific journal  Country：Japan

Research Projects

  • Large-area surveys for hydroxyl emission probing the comprehensive view of interstellar matter circulation in the Milky Way Galaxy International coauthorship

    Grant number：JPJSBP12023993  2023.10 - 2025.9

    Japan Society for Promotion of Science  International Collaborative Program  Bilateral Collaboration (Open Partnership)

    NAKANISHI Hiroyuki

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\4000000

  • 多波長電波同時高解像度撮像による星周物質の合成・加速過程の探求

    Grant number：16H02167  2016.4 - 2020.3

    日本学術振興会  科学研究費補助金  基盤研究(A)

    河野裕介、小川英夫、朝木義晴、新永浩子

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    本研究では、ミリ秒角の解像度}を実現する超長基線電波干渉法(VLBI)}において、複数波長帯電波を完全同時受信するシステムを積極的に導入し、従来感度的に困難であった短ミリ波帯VLBI撮像の手法を飛躍的に向上させる。その上で、研究の進展が最も期待される課題の１つである、長周期変光星から放出される星周物質の合成・加速過程}を探求する。発達した星周縁の中で恒星半径の2--3倍から数10倍の距離}にわたって分布する一酸化珪素(SiO)及び水(H2O)メーザーの空間分布時間変化を同時に連続追跡することで、宇宙における星間空間<-->恒星間の物質循環（星形成・恒星質量放出）のうち後者における力学的素過程を詳細に視覚化して理解することを目指す。

  • 高感度ミリ波VLBI撮像による星間分子ガス中の超微細空間構造の探求 International coauthorship

    Grant number：21H00047  2021.4 - 2023.3

    日本学術振興会  科学研究費助成事業  新学術領域研究(研究領域提案型)

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\4940000 （ Direct Cost: \3800000 、 Indirect Cost：\1140000 ）

  • 中性水素及び水酸基分子輝線の広視野電波干渉計探査に向けた像合成／像分析手法の開発

    2011.4 - 2013.3

    民間財団等  山田科学財団研究助成 

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    Grant type：Competitive

    中性水素及び水酸基分子輝線の広視野電波干渉計探査に向けた像合成／像分析手法の開発

  • 次世代大型電波干渉計建設に向けた若手研究者の国際連携構築

    2011.4 - 2013.3

    その他省庁等  日本学術振興会戦略的若手研究者戦略的海外派遣事業 

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    Grant type：Competitive

  • 革新的超高解像度リアルタイム水蒸気観測が解き明かす積乱雲発生の前兆と発達過程

    Grant number：23H00221  2024.4 - 2027.3

    文部科学省  科学研究費助成事業  基盤研究A

    市川隆一

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    Authorship：Coinvestigator(s)  Grant type：Competitive

    Grant amount：\1300000 （ Direct Cost: \1000000 、 Indirect Cost：\300000 ）

  • 地球と宇宙の時空計測の地平を拓く超広帯域大気スペクトル計測システムの開発 International coauthorship

    Grant number：21H04524  2021.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(A)(一般)

    氏原秀樹 他

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    Authorship：Coinvestigator(s)  Grant type：Competitive

    Grant amount：\1040000 （ Direct Cost: \800000 、 Indirect Cost：\240000 ）

    VLBIは遠方の天体からの電波を複数の電波望遠鏡で受信し、相関処理を行うことで10,000km の距離と方向をミリメートル精度で、また地球の 自転速度変動を1000分の1 秒を切る精度で計測可能な宇宙測地技術である。最近では「はやぶさ2」等の深宇宙探査機の軌道決定、大陸間での 光格子時計の高精度国際周波数比較にも貢献した。しかし受信機は各観測機関の目的に特化している。また根本的に電波星からの信号を地上で 受信する限り、地球大気による電波伝播遅延誤差が精度向上の壁である。本研究は革新的な超広帯域受信観測系を開発し、大気の壁と分野の壁 を超えた汎用VLBI観測による新たなサイエンスを拓くことを目標とする。

  • Exploration of direct tracking techniques for rapid evolution of interstellar regions

    2018.3 - 2018.4

    Other Ministries  JSPS Invitation Program for Foreign Researcher 

    Hiroshi Imai, Tomoya Hirota, Koichiro Sugiyama, Kenta Fujisawa, Kazuhito Motogi, Toshihiro Handa, Shigehisa Takakuwa, Tomofumi Umemoto

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    Grant type：Competitive

  • 宇宙メーザー放射を用いた高密度分子ガス領域の探求

    2016.2 - 2016.4

    その他省庁等  日本学術振興会外国人招へい研究者 

    　 More details

    Grant type：Competitive

  • HINOTORI (Hybrid Installation Project in Nobeyama, Triple-band Oriented)

    2015.10 - 2025.3

    Government Agency  Collaboration in Japan 

  • 韓国天文宇宙科学研究院(KASI)受託研究事業費

    2015.1 - 2017.12

    韓国天文宇宙科学研究院  一般受託研究 

    今井　裕、今井 裕

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    KaVA Large Programs on Circumstellar Masers

  • 星周縁から惑星状星雲への進化に関する電波波長横断的な研究

    2014.11 - 2014.12

    その他省庁等  日本学術振興会外国人招へい研究者 

    　 More details

    Grant type：Competitive

  • 広帯域センチ波望遠鏡によるサーベイ観測で探る銀河系の３次元構造と物質循環

    2014.7 - 2016.6

    その他省庁等  日本学術振興会二国間共同研究 

    高橋慶太郎、今井　裕

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    Grant type：Competitive

  • 宇宙空間超長基線電波干渉計観測による水酸基・水蒸気メーザー源の微細構造の探求

    2014.4 - 2015.3

    国際共同研究 

  • 銀河系水酸基メーザー源の広域掃天探査及びマゼラン雲軌道推定

    2014.4 - 2015.3

    国際共同研究 

  • 恒星進化末期における脈動変光及び高速ジェット形成のメカニズムの解明

    2014.4 - 2015.3

    国際共同研究 

  • 次世代大型電波干渉計（SKA）建設に向けた基盤開発と銀河研究、若手研究者の国際連携構築

    2014.4 - 2015.3

  • 大学間連携VLBIによる銀河系の進化と構造の解明

    2014.4 - 2015.3

  • VERA-銀河系精密立体地図の作成

    2014.4 - 2015.3

  • 宇宙空間超長基線電波干渉計観測に基づく宇宙メーザー微細構造の探究

    2014.2 - 2014.4

    その他省庁等  日本学術振興会外国人招へい研究者 

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    Grant type：Competitive

  • 水酸基メーザー天体に対する広域探査と高精度位置計測手法の確立

    Grant number：25610043  2013.4 - 2016.3

    日本学術振興会  科学研究費補助金  挑戦的萌芽研究

    今井　裕、中西裕之、朝木義晴

  • 超広帯域メーザー輝線VLBI観測システムの構築

    2013.4 - 2014.3

    一般受託研究 

  • 水素原子ガス雲及び水酸基メーザー源の銀河系広域にわたる高感度掃天探査

    2012.4 - 2013.3

    その他省庁等  日本学術振興会特定国派遣研究者事業 

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    Grant type：Competitive

  • 超広帯域メーザー輝線VLBI観測システムの構築

    2011.4 - 2012.3

    一般受託研究 

  • 水蒸気メーザー源の観測を通した惑星状星雲の研究

    2010.4 - 2012.3

    その他省庁等  日本学術振興会外国人特別研究員研究奨励費 

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    Grant type：Competitive

  • VSOP-2 を用いた高精度メーザー源測量に向けた遠方メーザー源及び位置参照電波源探査

    2010.4 - 2011.3

    一般受託研究 

  • 老星ジェットの探査と超精密解像観測

    2008.4 - 2010.3

    科学研究費補助金  基盤研究(C)

    今井　裕、出口修至

  • 進化末期の恒星に見られるジェットの発現・成長過程の解明

    2006.4 - 2007.3

    科学研究費補助金  若手研究(B)

  • 老星ジェットの探査と超精密解像観測

    2006.4 - 2007.3

    その他省庁等  日本学術振興会科学国際研究集会派遣事業 

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    Grant type：Competitive

  • 超長基線電波干渉法データ解析用パイプラインの開発

    2003

    基礎科学研究 

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    Grant type：Competitive

  • メーザー源に見られる超微細構造の研究

    1999.4 - 2002.3

    日本学術振興会  日本学術振興会特別研究員研究奨励費 

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    Grant type：Competitive

  • 超長基線電波干渉法による宇宙メーザーの観測と恒星物理学

    1999

    国際共同研究 

    　 More details

    Grant type：Competitive

  • 水メーザー源のVLBI観測による大質量星の形成過程・形成形態の研究

    1996.4 - 1999.3

    日本学術振興会  日本学術振興会特別研究員研究奨励費 

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    Grant type：Competitive

  • VSOP-2 を用いた高精度メーザー源測量に向けた遠方メーザー源及び位置参照電波源探査

    国立天文台  国立天文台客員准教授客員経費 

    今井 裕

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\550000

  • 超広帯域メーザー輝線VLBI観測システムの構築

    国立天文台  客員准教授客員経費 

    今井 裕

    　 More details

    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\300000

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Other research activities

  • Organization of the IAU Symposium on Cosmic Masers

    2023.3

 

Teaching Experience

  • Observations of celestial bodies and associating science and technology

    2024.4
    Institution：Kagoshima University

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    Level：Undergraduate (liberal arts)  Country：Japan

  • Measurements in the Universe and Eeath

    2020.10
    Institution：Kagoshima University

    　More details

    Country：Japan

  • 電波干渉計特論

    2013.10
    Institution：鹿児島大学

    　More details

    Level：Postgraduate 

  • 初年次セミナーII

    2018.10
    Institution：鹿児島大学

    　More details

    Level：Undergraduate (liberal arts) 

  • 初年次セミナーI

    2018.4
    Institution：鹿児島大学

    　More details

    Level：Undergraduate (liberal arts) 

  • 大学と地域

    2018.4
    Institution：鹿児島大学

    　More details

    Level：Undergraduate (liberal arts) 

  • 基礎物理学実験

    2019.4
    Institution：鹿児島大学

    　More details

    Level：Undergraduate (liberal arts) 

  • 「公開講座」実習

    Institution：鹿児島大学

  • セミナー・学問のススメ（導入科目）

    Institution：鹿児島大学

  • 電波干渉計特論

    Institution：鹿児島大学

  • 銀河天文学

    Institution：鹿児島大学

  • 観測的宇宙論

    Institution：鹿児島大学

  • 観測天文学特論

    Institution：鹿児島大学

  • 科学英語

    Institution：鹿児島大学

  • 物理学概論

    Institution：鹿児島大学

  • 物理学基礎BII（農学部１年生対象）

    Institution：鹿児島大学

  • 星間物理学特論

    Institution：鹿児島大学

  • 情報計測科学

    Institution：鹿児島大学

  • 情報社会と科学（隔年）

    Institution：鹿児島大学

  • 情報物理学演習I （電磁気学演習）

    Institution：鹿児島大学

  • 情報活用基礎

    Institution：鹿児島大学

  • 宇宙科学基礎演習

    Institution：鹿児島大学

  • 宇宙科学

    Institution：鹿児島大学

  • 宇宙生物学特論

    Institution：鹿児島大学

  • 天体観測実習

    Institution：鹿児島大学

  • 基礎物理学実験(A・B)

    Institution：鹿児島大学

  • プログラミング基礎演習

    Institution：鹿児島大学

▼display all

 

Media Coverage

  • すばる・アルマより愛を込めて TV or radio program

    NHK  コズミックフロント  2021.4

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    Author：Other 

  • 「鹿児島であることが一番 うれしい」鹿児島で初 国際天文学連合のシンポ始まる TV or radio program

    MBC南日本放送  MBCニュース  2023.3

  • 記者会見（熱い抱擁を遂げた双子星の末路を解明） Internet

    国立天文台、鹿児島大学  2021.12

    　More details

    Author：Myself 

  • 記者会見（星の最終進化始まりの合図を発見）

    日本天文学会、鹿児島大学  2021.9

  • 記者会見（宇宙の噴水）

    鹿児島大学  2020.3

Academic Activities

  • Organization of International Astronomical Union Symposium 380 International contribution

    Role(s)： Planning, management, etc.

    IMAI Hiroshi, NAKAGAWA Akiharu, HIROTA Tomoya  2023.3

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    Type：Competition, symposium, etc.