Exploration of synthesis and outward acceleration of circumstellar matter through simultaneous multiple-band high-resolution radio imaging

• Project/Area Number: 16H02167
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Kagoshima University
• Principal Investigator: IMAI Hiroshi 鹿児島大学, 総合科学域総合教育学系, 准教授 (70374155)
• Co-Investigator(Kenkyū-buntansha): 朝木 義晴 国立天文台, チリ観測所, 准教授 (00332148) ; 河野 裕介 国立天文台, 水沢VLBI観測所, 助教 (00370106) ; 小川 英夫 大阪府立大学, 理学(系)研究科(研究院), 客員教授 (20022717) ; 新永 浩子 鹿児島大学, 理工学域理学系, 准教授 (20709589)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥46,670,000 (Direct Cost: ¥35,900,000、Indirect Cost: ¥10,770,000); Fiscal Year 2019: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000); Fiscal Year 2018: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2017: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000); Fiscal Year 2016: ¥26,650,000 (Direct Cost: ¥20,500,000、Indirect Cost: ¥6,150,000)
• Keywords: 超長基線電波干渉法(VLBI) / 複数波長帯電波同時観測 / 多孔式周波数分離板 / 宇宙メーザー / 長周期脈動変光星 / 宇宙物理 / 恒星進化 / 超長基線電波干渉法 / 複数波長帯同時観測 / 波長帯電波同時観測

Outline of Final Research Achievements

Our project succeeded in developing the triple-radio-band receiving system in the Nobeyama 45 m telescope. There we confirmed that the perforated frequency-band-separation filter plates we developed have the expected performance in the transparency rate and the pointing offset in the higher frequency bands. Using a part of this system, we succeeded in detecting the ignitions of jets from dying stars and periodic behaviors of circumstellar water and silicon-monoxide masers. Our intensive monitoring observations of circumstellar maser sources using the East Asia VLBI Network also have yielded detections of the different performances in the temporal variations of in the brightness distributions of water and silicon-monoxide masers in the common circumstellar envelope. These imply the possibility that we can reveal the variations in the bulk motions and the physical conditions of the maser gas clumps in the circumstellar envelopes affected by stellar pulsation and shock propagation.

Academic Significance and Societal Importance of the Research Achievements

高感度の大型電波望遠鏡における３周波数帯同時観測システムの構築によって、電波観測の効率が飛躍的に進むだけでなく、異種電波放射間の相対輝度分布の高精度での把握が求められる研究でその進展が見込める。VLBI観測においては、分子輝線が豊富なミリ波帯の電波データに対する高精度較正が実現し、多くの輝線では未知だった精密な空間輝度分布の把握が進む。本課題では、星周メーザー源に対する観測でその実用化を進めた。その中で、物理状態によって制御されるメーザー源の見かけの振る舞いと、メーザー源における真の物質運動とを見分けられる見通しがついた。今後、終末星からの物質放出を定量的に理解することにつながるはずである。

Research Products

• [Int'l Joint Research] 韓国天文宇宙科学研究院/Chungbuk National University(韓国)
• [Int'l Joint Research] 上海天文台/新疆天文台/中山大学(中国)
• [Int'l Joint Research] アンダルシア天体物理学研究所/スペイン高等科学研究院(スペイン)
• [Int'l Joint Research] タスマニア大学/西オーストラリア大学/Australia Telescope National Facility(オーストラリア)
• [Int'l Joint Research] シャルマース工科大学(スウェーデン)
• [Int'l Joint Research]
• [Int'l Joint Research] 韓国天文宇宙科学研究院(韓国)
• [Int'l Joint Research] 上海天文台/新疆天文台(中国)
• [Int'l Joint Research] ICRAR/University of Tasmania/CSIRO(オーストラリア)
• [Int'l Joint Research] ウラル連邦大学(ロシア連邦)
• [Int'l Joint Research] Joint Institute for VLBI in Europe(オランダ)
• [Int'l Joint Research]
• [Int'l Joint Research] 韓国天文宇宙科学研究院(韓国)
• [Int'l Joint Research] ICRAR(オーストラリア)
• [Int'l Joint Research] ウラル連邦大学(ロシア連邦)
• [Int'l Joint Research] Joint Institute for VLBI in Europe(オランダ)
• [Int'l Joint Research] 上海天文台/新疆天文台(中国)
• [Int'l Joint Research]
• [Int'l Joint Research] 韓国天文宇宙科学研究院/国立ソウル大学(韓国)
• [Int'l Joint Research] CSIRO/ICRAR/タスマニア大学(オーストラリア)
• [Int'l Joint Research] 上海天文台/新疆天文台(中国)
• [Int'l Joint Research] JIVE(オランダ)
• [Int'l Joint Research] ケレエ大学/マンチェスター大学(英国)
• [Int'l Joint Research]
• [Journal Article] Development of a 22/43 GHz-band quasi-optical perforated plate and dual-band observation system of the Nobeyama 45 m telescope (2020)
  • Author(s): Okada, Nozomi; Hashimoto, Ikumi; Kimura, Kimihiro; Manabe, Takeshi; Tokuda, Kazuki; Onishi, Toshikazu; Ogawa, Hideo; Imai, Hiroshi; Minamidani, Tetsuhiro
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 1 Pages: 7-7
  • DOI: 10.1093/pasj/psz126
  • Peer Reviewed
• [Journal Article] Shaping the Envelope of the Asymptotic Giant Branch Star W43A with a Collimated Fast Jet (2020)
  • Author(s): Tafoya, Daniel; Imai, Hiroshi; Gomez, Jose; F.; Nakashima, Jun-ichi; Orosz, Gabor; Yung, Bosco H. K.
  • Journal Title: The Astrophysical Journal Letters Volume: 890 Issue: 1 Pages: L14-L14
  • DOI: 10.3847/2041-8213/ab70b8
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] RadioAstron probes the ultra-fine spatial structure in the H2O maser emission in the star forming region W49N (2020)
  • Author(s): Shakhvorostova, N. N.; Sobolev, A. M.; Moran, J. M.; Alakoz, A. V.; Imai, H.; Avdeev, V. Y.
  • Journal Title: Advances in Space Research Volume: 65 Issue: 2 Pages: 772-779
  • DOI: 10.1016/j.asr.2019.05.011
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Accurate OH Maser Positions from the SPLASH Survey. III. The Final 96 deg^2 (2020)
  • Author(s): Qiao, Hai-Hua; Breen, Shari L.; Gomez, Jose; F.; Dawson, J. R.; Walsh, Andrew J.; Green, James A.; Ellingsen, Simon P.; Imai, Hiroshi; Shen, Zhi-Qiang
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 247 Issue: 1 Pages: 5-5
  • DOI: 10.3847/1538-4365/ab655d
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Overall variation of the H2O masers around W Hydrae in 28 years (2019)
  • Author(s): Imai, Hiroshi; Nakagawa, Akiharu; Takaba, Hiroshi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 71 Issue: 6 Pages: 126-126
  • DOI: 10.1093/pasj/psz105
  • Peer Reviewed
• [Journal Article] Time variations of H2O and SiO masers in the proto-Planetary Nebula OH 231.8+4.2 (2019)
  • Author(s): Kim, Jaeheon; Cho, S. -H.; Bujarrabal, V.; Imai, H.; Dodson, R.; Yoon, D. -H.; Zhang, B.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 488 Pages: 1427-1445
  • DOI: 10.1093/mnras/stz1830
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Looking for new water-fountain stars (2019)
  • Author(s): Uscanga, L.; Gomez, J. F.; Yung, B. H. K.; Imai, H.; Rizzo, J. R.; Suarez, O.; Miranda, L. F.; Trinidad, M. A.; Anglada, G.; Torrelles, J. M.
  • Journal Title: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time. Proceedings of the International Astronomical Union Volume: 343 Issue: S343 Pages: 527-528
  • DOI: 10.1017/s1743921318007354
  • Int'l Joint Research
• [Journal Article] A balloon-borne very long baseline interferometry experiment in the stratosphere: Systems design and developments (2019)
  • Author(s): Doi, A.; Kono, Y.; Ogawa, H. et al.
  • Journal Title: Advances in Space Research Volume: 63 Issue: 1 Pages: 779-793
  • DOI: 10.1016/j.asr.2018.09.020
  • NAID: 120006885510
  • Peer Reviewed
• [Journal Article] A 1000 au Scale Molecular Outflow Driven by a Protostar with an Age of <4000 yr (2019)
  • Author(s): Furuya, Ray S.; Kitamura, Yoshimi; Shinnaga, Hiroko
  • Journal Title: The Astrophysical Journal Volume: 871 Issue: 2 Pages: 137-137
  • DOI: 10.3847/1538-4357/aaf85c
  • Peer Reviewed
• [Journal Article] Correlation between SiO v = 3 J = 1 → 0 maser excitation and the light curve of a long-period variable star (2018)
  • Author(s): Oyadomari, M.; Imai, H.; Nagayama, T.i; Oyama, T.i; Matsumoto, N.; Nakashima, J.-I.; Cho, S.-H.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 70 Issue: 3 Pages: 33-33
  • DOI: 10.1093/pasj/psy021
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Astrometrically registered maps of H2O and SiO masers toward VX Sagittarii (2018)
  • Author(s): Yoon, Dong-Hwan; Cho, Se-Hyung; Yun, Youngjoo; Choi, Yoon Kyung; Dodson, Richard; Rioja, Maria; Kim, Jaeheon; Imai, Hiroshi; Kim, Dongjin; Yang, Haneul; Byun, Do-Young
  • Journal Title: Nature Communications Volume: 9 Pages: 2534-2534
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Rapidly evolving episodic outflow in IRAS 18113-2503: clues to the ejection mechanism of the fastest water fountain (2018)
  • Author(s): Orosz, G., Gomez, 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., Suarez, O., Uscanga, L.,
  • Journal Title: Monthly Notices of the Royal Astronomical Society: Letters Volume: 482 Issue: 1 Pages: L40-L45
  • DOI: 10.1093/mnrasl/sly177
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Accurate OH Maser Positions. II. The Galactic Center Region (2018)
  • Author(s): Qiao, H.-H., Walsh, A. J., Breen, S. L., Gomez, J. F., Dawson, J. R., Imai, H., Ellingsen, S. P., Ellingsen, S. P., Shen, Z.-Q.,
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 239 Issue: 1 Pages: 15-15
  • DOI: 10.3847/1538-4365/aae580
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements (2018)
  • Author(s): Soam, Archana; Pattle, Kate; Ward-Thompson, Derek; Lee, Chang Won; Sadavoy, Sarah; Koch, Patrick M.; Kim, Gwanjeong; Kwon, Jungmi; Kwon, Woojin; Arzoumanian, Doris; Berry, David; Hoang, Thiem; Tamura, Motohide; Lee, Sang-Sung; Liu, Tie; Tsukamoto, Yusuke et.al
  • Journal Title: The Astrophysical Journal Volume: 861 Issue: 1 Pages: 65-78
  • DOI: 10.3847/1538-4357/aac4a6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A First Look at BISTRO Observations of the ρ Oph-A core (2018)
  • Author(s): Kwon, Jungmi; Doi, Yasuo; Tamura, Motohide; Matsumura, Masafumi; Pattle, Kate; Berry, David; Sadavoy, Sarah; Matthews, Brenda C.; Ward-Thompson, Derek; Hasegawa, Tetsuo; Furuya, Ray S.; Pon, Andy; Di Francesco, James; Arzoumanian, Doris; Tsukamoto, Yusuke et.al
  • Journal Title: The Astrophysical Journal Volume: 859 Issue: 1 Pages: 4-26
  • DOI: 10.3847/1538-4357/aabd82
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sun-sized Water Vapor Masers in Cepheus A (2018)
  • Author(s): Sobolev, A. M.; Moran, J. M.; Gray, M. D.; Alakoz, A.; Imai, H.; Baan, W. A.; Tolmachev, A. M.; Samodurov, V. A.; Ladeyshchikov, D. A.
  • Journal Title: The Astrophysical Journal Volume: 856 Issue: 1 Pages: 60-60
  • DOI: 10.3847/1538-4357/aab096
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Capabilities and prospects of the East Asia Very Long Baseline Interferometry Network (2018)
  • Author(s): An, T.; Sohn, B. W.; Imai, H.
  • Journal Title: Nature Astronomy Volume: 2 Issue: 2 Pages: 118-125
  • DOI: 10.1038/s41550-017-0277-z
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A dearth of OH/IR stars in the Small Magellanic Cloud (2018)
  • Author(s): Goldman, Steven R.; van Loon, Jacco Th.; Gomez, Jose, F.; Green, James A.; Zijlstra, Albert A.; Nanni, Ambra; Imai, Hiroshi; Whitelock, Patricia A.; Groenewegen, Martin A. T.; Oliveira, Joana M.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 473 Issue: 3 Pages: 3835-3853
  • DOI: 10.1093/mnras/stx2601
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The ALMA Phasing System: A Beamforming Capability for Ultra-high-resolution Science at (Sub)Millimeter Wavelengths (2018)
  • Author(s): Matthews, L. D., 他40名（M. Honma 19番目）
  • Journal Title: Publications of the Astronomical Society of the Pacific Volume: 130 Issue: 983 Pages: 015002-015002
  • DOI: 10.1088/1538-3873/aa9c3d
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Trigonometric distance and proper motions of H2O maser bowshocks in AFGL 5142 (2017)
  • Author(s): Burns R. A.、Handa T.、Imai H.、Nagayama T.、Omodaka T.、Hirota T.、Motogi K.、van Langevelde H. J.、Baan W. A.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 467 Pages: 2367-2376
  • DOI: 10.1093/mnras/stx216
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Phase correction for ALMA. Investigating water vapour radiometer scaling: The long-baseline science verification data case study (2017)
  • Author(s): Maud, L. T.; Tilanus, R. P. J.; van Kempen, T. A.; Hogerheijde, M. R.; Schmalzl, M.; Yoon, I.; Contreras, Y.; Toribio, M. C.; Asaki, Y.; Dent, W. R. F.; Fomalont, E.; Matsushita, S.
  • Journal Title: Astronomy & Astrophysics Volume: 605 Pages: A121-A121
  • DOI: 10.1051/0004-6361/201731197
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A comparative study of amplitude calibrations for the East Asia VLBI Network: A priori and template spectrum methods (2017)
  • Author(s): Cho, Ilje; Jung, Taehyun; Zhao, Guang-Yao; Akiyama, Kazunori; Sawada-Satoh, Satoko; Kino, Motoki; Byun, Do-Young; Sohn, Bong Won; Shibata, Katsunori M.; Hirota, Tomoya; Niinuma, Kotaro; Yonekura, Yoshinori; Fujisawa, Kenta; Oyama, Tomoaki
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 6
  • DOI: 10.1093/pasj/psx090
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS?J110006.07+442144.3 (2017)
  • Author(s): T. Morokuma, M. Tanaka, Y. Tanaka, et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 5 Pages: 82-103
  • DOI: 10.1093/pasj/psx075
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Pilot KaVA monitoring on the M 87 jet: Confirming the inner jet structure and superluminal motions at sub-pc scales (2017)
  • Author(s): Hada, Kazuhiro; Sawada-Satoh, Satoko (15番目); 他(計40名)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 4 Pages: 71-80
  • DOI: 10.1093/pasj/psx054
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Trigonometric parallax measurement of a water maser source toward the Sgr D H II region (2017)
  • Author(s): D. Sakai, T. Oyama, T. Nagayama, M. Honma, H. Kobayashi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 4 Pages: 1-7
  • DOI: 10.1093/pasj/psx039
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Strong magnetic field generated by the extreme oxygen-rich red supergiant VY Canis Majoris (2017)
  • Author(s): H. Shinnaga, M.J. Claussen, S. Yamamoto, M. Shimojo
  • Journal Title: Publications of the Astronomical Society of Japan (Letter) Volume: 69 Issue: 6
  • DOI: 10.1093/pasj/psx110
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Observational demonstration of a high image rejection SIS mixer receiver using a new waveguide filter at 230 GHz (2017)
  • Author(s): Hasegawa, Yutaka; Asayama, Shinichiro; Harada, Ryohei; Tokuda, Kazuki; Kimura, Kimihiro; Ogawa, Hideo; Onishi, Toshikazu
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 69 Issue: 6
  • DOI: 10.1093/pasj/psx098
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity (2017)
  • Author(s): 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., Gomez, J. F.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 465 Issue: 1 Pages: 403-433
  • DOI: 10.1093/mnras/stw2708
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Astrometry of OH/IR Stars Using 1612 MHz Hydroxyl Masers. I. Annual Parallaxes of WX Psc and OH138.0+7.2 (2017)
  • Author(s): 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.; Tafoya, D.
  • Journal Title: The Astronomical Journal Volume: 153 Issue: 3 Pages: 1-13
  • DOI: 10.3847/1538-3881/153/3/119
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Do water fountains jets really indicate the onset of the morphological metamorphosis of circumstellar envelopes? (2017)
  • Author(s): Yung, B.H.K., Nakashima, J.-I., Hsia, C.-H., Imai, H.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 465 Issue: 4 Pages: 4482-4499
  • DOI: 10.1093/mnras/stw2931
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] MultiView High Precision VLBI Astrometry at Low Frequencies (2017)
  • Author(s): Rioja, M. J., Dodson, R., Orosz, G., Imai, H., Frey, S.
  • Journal Title: The Astronomical Journal Volume: 153 Issue: 3 Pages: 105-105
  • DOI: 10.3847/1538-3881/153/3/105
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] SiO Masers around WX Psc Mapped with the KVN and VERA Array (KaVA) (2016)
  • Author(s): Yun, Youngjoo; Cho, Se-Hyung; Imai, Hiroshi; and 59 coauthors
  • Journal Title: The Astrophysical Journal Volume: 822 Issue: 1 Pages: 3-3
  • DOI: 10.3847/0004-637x/822/1/3
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of cross-correlation spectromery and the coherent structures of maser sources (2016)
  • Author(s): Takefuji, K., Imai, H., Sekido, M.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 5
  • DOI: 10.1093/pasj/psw077
  • Peer Reviewed
• [Journal Article] First Simultaneous mapping of four 7 mm SiO maser lines using the OCTAVE System (2016)
  • Author(s): Oyama, T., Kono, Y., Suzuki, S., Kanaguchi, M., Nishikawa, T., Kawaguchi, N., Hirota, T., Nagayama, T., Kobayashi, H., Imai, H., Kuwahara, S., Kano, A., Oyadomari, M., Chong, S.-N.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 6
  • DOI: 10.1093/pasj/psw099
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Measuring Magnetic Fields from Water Masers Associated with the Synchrotron Protostellar Jet in W3(H2O) (2016)
  • Author(s): Goddi, C., Surcis, G., Moscadelli, L., Imai, H., Vlemmings, W.H.T., van Langevelde, H.J., Sanna, A.
  • Journal Title: Astronomy and Astrophysics Volume: 597 Pages: A43-A43
  • DOI: 10.1051/0004-6361/201629321
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spatially Resolved HCN Absorption Features in the Circumnuclear Region of NGC 1052 (2016)
  • Author(s): Sawada-Satoh, Satoko; Roh, Duk-Gyoo; Oh, Se-Jin; Lee, Sang-Sung; Byun, Do-Young; Kameno, Seiji; Yeom, Jae-Hwan; Jung, Dong-Kyu; Kim, Hyo-Ryoung; Hwang, Ju-Yeon
  • Journal Title: The Astrophysical Journal Letters Volume: 830 Issue: 1 Pages: L3-L3
  • DOI: 10.3847/2041-8205/830/1/l3
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 「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 (2019)
  • Author(s): 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, Jose Francisco Gomez, Daniel Tafoya, Lucero Uscanga
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] 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 (2019)
  • Author(s): 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 and NESS Team
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] 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 (2019)
  • Author(s): 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
  • Organizer: 日本天文学会2019年秋季年会
• [Presentation] Current progress in ESTEMA and relevant EAVN commissioning (2019)
  • Author(s): Hiroshi Imai
  • Organizer: 12th East Asian VLBI Workshop
  • Int'l Joint Research / Invited
• [Presentation] 野辺山45m電波望遠鏡における 22/43 GHz 帯同時観測評価 (2018)
  • Author(s): 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
  • Organizer: 日本天文学会秋季年会
• [Presentation] 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 (2018)
  • Author(s): 木村公洋, 岡田望, 橋本育実, 小川英夫, 真鍋武嗣, 今井裕
  • Organizer: 日本天文学会秋季年会
• [Presentation] Exploration of extended circumstellar matter around dying stars (2018)
  • Author(s): Hiroshi Imai
  • Organizer: NOEMA/30m Workshop
  • Int'l Joint Research / Invited
• [Presentation] Status Reports on EAVN Evolved Stars Science Working Group and ESTEMA (2018)
  • Author(s): Hiroshi Imai
  • Organizer: EAST ASIAN VLBI WORKSHOP 2018
  • Int'l Joint Research
• [Presentation] Development in HINOTORI - 22/43 GHz simultaneous observation system in the Nobeyama 45-m Telescope - (2018)
  • Author(s): Nozomi OKADA, Hideo OGAWA, Tomoaki OYAMA, et al.
  • Organizer: 19th East Asia Submillimeter-wave Receiver Technology Workshop
  • Int'l Joint Research
• [Presentation] 野辺山45 m電波望遠鏡による3帯域同時観測に向けたTZ受信機の改造 (2018)
  • Author(s): 堤稔喜 藤澤健太 新沼浩太郎 甘利涼湖, 小川英夫 岡田望 増井翔
  • Organizer: VLBI懇談会シンポジウム2018
• [Presentation] 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- (2018)
  • Author(s): 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
  • Organizer: VLBI懇談会シンポジウム2018
• [Presentation] 野辺山45 m電波望遠鏡搭載同時観測用周波数フィルタの開発(II) (2018)
  • Author(s): 岡田 望, 橋本 育実, 保田 大介, 高田 勝太, 本間 愛彩, 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, 岸本 直子, 水窪 耕兵, 澤田-佐藤 聡子, 今井 裕
  • Organizer: 日本天文学会春季年会
• [Presentation] Strong magnetic field generated by the extreme red supergiant VY Canis Majoris (2018)
  • Author(s): 新永浩子
  • Organizer: 日本天文学会春季年会
• [Presentation] Circumstellar, interstellar, and circumnuclear water masers as probes of fine structures of astrophysical objects (2017)
  • Author(s): Hiroshi Imai
  • Organizer: Black Hole Astrophysics with VLBI: Past, Present, and Future
  • Place of Presentation: 国立天文台三鷹（東京都三鷹市）
  • Year and Date: 2017-03-27
  • Int'l Joint Research / Invited
• [Presentation] Circumnuclear Torus Revealed by VLBI (2017)
  • Author(s): Satoko Sawada-Satoh
  • Organizer: Black Hole Astrophysics with VLBI: Past, Present, and Future
  • Place of Presentation: 国立天文台三鷹（東京都三鷹市）
  • Year and Date: 2017-03-27
  • Int'l Joint Research
• [Presentation] ALMA High Frequency (Long Baseline) Capability Commissioning Campaign 2017 (2017)
  • Author(s): Yoshiharu Asaki
  • Organizer: Black Hole Astrophysics with VLBI
  • Place of Presentation: ウプサラ（スェーデン）
  • Year and Date: 2017-03-27
  • Int'l Joint Research
• [Presentation] 野辺山45m望遠鏡22GHz/43GHz同時観測用FSSの試作と測定 (2017)
  • Author(s): 真鍋武嗣、岡田望、木村公洋、小川英夫、橋本育実、千葉正克
  • Organizer: 2017年電子情報通信学会総合大会
  • Place of Presentation: 大阪大学（大阪府豊中市）
  • Year and Date: 2017-03-22
• [Presentation] 野辺山 45 m 鏡搭載 20/40 GHz 帯同時観測用周波数フィルタの開発 (2017)
  • Author(s): 岡田 望, 橋本 育実, 高田 勝太, 本間 愛彩, 高橋 諒, 木村 公洋, 千葉 正克, 真鍋 武嗣, 小川 英夫, 大西 利和, 南谷 哲宏, 宮本 祐介, 宮澤 和彦, 齋藤 正雄, 岸本 直子, 水窪耕兵, 今井 裕
  • Organizer: 日本天文学会2017年春季年会
  • Place of Presentation: 九州大学（福岡県福岡市）
  • Year and Date: 2017-03-15
• [Presentation] 野辺山 45 m 電波望遠鏡搭載同時観測用周波数フィルタの開発 (2017)
  • Author(s): 岡田 望, 橋本 育実, 高田 勝太, 本間 愛彩, 木村 公洋, 千葉 正克, 真鍋 武嗣, 小川 英夫, 大西 利和, 南谷 哲宏, 宮本 祐介, 宮澤 和彦, 宮澤 千栄子, 岸本 直子, 水窪 耕兵, 澤田-佐藤 聡子, 今井 裕
  • Organizer: 日本天文学会秋季年会
• [Presentation] 野辺山 45m 電波望遠鏡複周波数バンド同時観測プロジェクト (Hybrid Installa- tion Project in Nobeyama, Triple-band Oriented) (2017)
  • Author(s): 澤田-佐藤聡子, 今井裕, 半田利弘, 新永浩子, 水窪耕兵, 小川英夫, 真鍋武嗣, 木村公洋, 岡田望, 橋本育実, 南谷哲宏, 小山友明, 河野裕介, 砂田和良, 田村良明, 坂井伸行, 朝木義晴, 亀野誠二, 新沼浩太郎, 藤澤健太, 米倉覚則
  • Organizer: 日本天文学会秋季年会
• [Presentation] Towards decadal continuous viewing of circumstellar maser sources (2017)
  • Author(s): Hiroshi Imai
  • Organizer: IAU Symposium 336
  • Int'l Joint Research / Invited
• [Presentation] Intermittent Mass Blowout of the Red Supergiant S Per (2016)
  • Author(s): Yoshiharu Asaki
  • Organizer: Pulsation 2016
  • Place of Presentation: San Pedro de Atacama（チリ）
  • Year and Date: 2016-11-28
  • Int'l Joint Research
• [Presentation] MultiView; a pilot study for precise VLBI astrometry at low frequencies using multiple calibrators (2016)
  • Author(s): Gabor Orosz, Hiroshi Imai, Richard Dodson, Maria Rioja, Dieter Engeles, Sandra Etoka, Sandor Frey
  • Organizer: 13th European VLBI Network Meeting
  • Place of Presentation: サンクトペテルブルク（ロシア）
  • Year and Date: 2016-09-20
  • Int'l Joint Research
• [Presentation] Correlation of the relative SiO maser distributions with the stellar light curves (2016)
  • Author(s): Miyako Oyadomari, Hiroshi Imai
  • Organizer: 13th European VLBI Network Meeting
  • Place of Presentation: サンクトペテルブルク（ロシア）
  • Year and Date: 2016-09-20
  • Int'l Joint Research
• [Presentation] Water fountain jets as seen by VLBI maser astrometry (2016)
  • Author(s): Gabor Orosz, Hiroshi Imai, Daniel Tafoya, Jose Francisco Gomez, Olga Suarez, Ricardo Rizzo, Andres Perez Sanchez, Steve Goldman, Ross Burns
  • Organizer: SCHOCKS2016 Conference
  • Place of Presentation: トルン（ポーランド）
  • Year and Date: 2016-09-14
  • Int'l Joint Research
• [Presentation] Wide-band VLBI observations of multiple SiO maser lines using the OCTAVE system (2016)
  • Author(s): 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
  • Organizer: Asia-Pacific Radio Science Conference 2016
  • Place of Presentation: ソウル（韓国）
  • Year and Date: 2016-08-21
  • Int'l Joint Research / Invited
• [Presentation] Radio Astrometry towards the Nearby Universe with the Square Kilometre Array (2016)
  • Author(s): Hiroshi Imai, SKA-JP Astrometry Science Working Group
  • Organizer: Asia-Pacific Radio Science Conference 2016
  • Place of Presentation: ソウル（韓国）
  • Year and Date: 2016-08-21
  • Int'l Joint Research / Invited
• [Presentation] Water fountain jets as seen by VLBI maser astrometry (2016)
  • Author(s): Gabor Orosz, Hiroshi Imai, Daniel Tafoya, Jose Francisco Gomez, Olga Suarez, Ricardo Rizzo, Andres Perez Sanchez, Steve Goldman, Ross Burns
  • Organizer: Blowing in the wind, Rencontres du Vietnam
  • Place of Presentation: クイニョン（ベトナム）
  • Year and Date: 2016-08-07
  • Int'l Joint Research / Invited
• [Presentation] "VLBI observations of circumstellar maser sources for exploration of stellar pulsation-driven shock waves " (2016)
  • Author(s): Hiroshi Imai
  • Organizer: Blowing in the wind, Rencontres du Vietnam
  • Place of Presentation: クイニョン（ベトナム）
  • Year and Date: 2016-08-07
  • Int'l Joint Research / Invited
• [Presentation] Map Comparison between Quadruple Masers of the Red Supergiant S Per Using VLBI Source/Frequency Phase Transfer Technique (2016)
  • Author(s): Yoshiharu Asaki
  • Organizer: Cool Stars 19 th
  • Place of Presentation: ウプサラ（スェーデン）
  • Year and Date: 2016-06-06
  • Int'l Joint Research
• [Presentation] Planning VLBI in the SKA era (2016)
  • Author(s): Hiroshi Imai, SKA-JP Astrometry Science Working Group
  • Organizer: Astronomy Development in Vietnam, Challenges and Opportunities
  • Place of Presentation: クイニョン（ベトナム）
  • Int'l Joint Research / Invited
• [Remarks] 天の川銀河研究センター星間・星周物理学研究室
  • URL: http://milkyway.sci.kagoshima-u.ac.jp/~imai/lab/
• [Remarks] メーザー放射をプローブとした星や銀河及び星間物質の研究
  • URL: https://www.kagoshima-u.ac.jp/researcher/2020/04/post-27.html
• [Remarks] 【天の川銀河研究センター】「臨終間近の老星が変身する瞬間を捉えた！」
  • URL: https://www.kagoshima-u.ac.jp/topics/2020/03/post-1678.html
• [Remarks] 星間・星周物理学研究チーム（今井研究室）紹介ページ
  • URL: http://milkyway.sci.kagoshima-u.ac.jp/~imai/lab/
• [Remarks] 日韓共同VLBI観測網本格運用開始 ―うお座WX星周囲に見られる一酸化珪素メーザー
  • URL: http://www.miz.nao.ac.jp/vera/content/news/topic/20160531-186
• [Funded Workshop] Joint Australian and Japanese SKA Astrometry Schools (2016)
  • Place of Presentation: ホバート（オーストラリア）
  • Year and Date: 2016-06-14