International joint research for maser variability and mass accretion processes in high-mass protostars

• Project/Area Number: 17K05398
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: Hirota Tomoya 国立天文台, 水沢VLBI観測所, 助教 (10325764)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 電波天文学 / 大質量星形成 / メーザー / 超長基線電波干渉計(VLBI) / アルマ / タイムドメイン天文学 / 多波長天文学 / アルマ(ALMA) / 超長基線電波干渉計

Outline of Final Research Achievements

This research aims to investigate time variation of strong maser emission associated with high-mass protostars, which are newly born stars more massive than 8 times the Solar masses, through radio interferometer observations. In the first year of this study, an international collaboration team Maser Monitoring Organization (M2O) was established during an international conference in Italy. As a result, maser flares in two sources, G358.93 and G24.33, were successfully identified. In addition, detailed observational studies on well studied sources, NGC6334 and S255, were also carried out. It is found that the maser flare could be caused by luminosity increase due to mass accretion onto protostars, and that the accretion rate and timescale show source-to-source differences.

Academic Significance and Societal Importance of the Research Achievements

大質量星は、星団で形成され周囲のガスを電離したり、進化末期に超新星爆発を起こして重元素を放出したりするなど宇宙や銀河の進化にも大きな影響を与える重要な存在である。しかし、生まれたばかりの大質量原始星は数が少ないために、これらがどのようにして周囲から物質を獲得（質量降着）して成長するのか、という基本問題についても理解が進んでいない。本科研費による国際共同研究は、大質量原始星が成長する際に起こる周辺環境の変化をメーザー放射の時間変動によって捉える手法を確立し、大質量星形成の理論を構築する上で重要な役割を果たしている。

Research Products

• [Int'l Joint Research] タイ国立天文学研究所(タイ)
• [Int'l Joint Research] バンドン工科大学(インドネシア)
• [Int'l Joint Research] ノースウエスト大学/南アフリカ電波天文観測所/SKA機構(南アフリカ)
• [Int'l Joint Research] キョンヒ大学/韓国天文研究院(韓国)
• [Int'l Joint Research] マックスプランク電波天文研究所(ドイツ)
• [Int'l Joint Research]
• [Int'l Joint Research] NARIT(タイ)
• [Int'l Joint Research] Max Planck Institute for Radio Astronomy(ドイツ)
• [Int'l Joint Research] Arcetri Observatory(イタリア)
• [Int'l Joint Research] NRAO/UC Berkeley(米国)
• [Int'l Joint Research] KASI/Kyung Hee Unversity(韓国)
• [Int'l Joint Research]
• [Int'l Joint Research] NARIT(タイ)
• [Int'l Joint Research] Max Planck Institute for Radio Astronomy(ドイツ)
• [Int'l Joint Research] Arcetri Observatory(イタリア)
• [Int'l Joint Research] NRAO/UC Berkeley(米国)
• [Int'l Joint Research] KASI/Kyung Hee Unversity(韓国)
• [Int'l Joint Research]
• [Int'l Joint Research] NARIT(タイ)
• [Int'l Joint Research] Max Planck Institute for Radio Astronomy(ドイツ)
• [Int'l Joint Research] Arcetri Observatory(イタリア)
• [Int'l Joint Research] NRAO/UC Berkeley(米国)
• [Int'l Joint Research] KASI/Kyung Hee Unversity(韓国)
• [Int'l Joint Research]
• [Int'l Joint Research] UNAM(メキシコ)
• [Int'l Joint Research] NARIT/Khon Kaen University(タイ)
• [Int'l Joint Research] Max Planck Institute for Radio Astronomy(ドイツ)
• [Int'l Joint Research] Joint Institute for VLBI ERIC(オランダ)
• [Int'l Joint Research] Arcetri Observatory(イタリア)
• [Int'l Joint Research]
• [Journal Article] Structure of the Source I Disk in Orion-KL (2022)
  • Author(s): Wright Melvyn、Bally John、Hirota Tomoya、Miller Kyle、Harding Tyler、Colleluori Keira、Ginsburg Adam、Goddi Ciriaco、McGuire Brett
  • Journal Title: The Astrophysical Journal Volume: 924 Issue: 2 Pages: 107-107
  • DOI: 10.3847/1538-4357/ac391b
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). V. Deuterated Molecules in the 70 μm Dark IRDC G14.492-00.139 (2022)
  • Author(s): Sakai Takeshi、Sanhueza Patricio、Furuya Kenji、Tatematsu Ken’ichi、Li Shanghuo、Aikawa Yuri、Lu Xing、Zhang Qizhou、Morii Kaho、Nakamura Fumitaka、Takemura Hideaki、Izumi Natsuko、Hirota Tomoya、Silva Andrea、Guzman Andres E.、Sakai Nami、Yamamoto Satoshi
  • Journal Title: The Astrophysical Journal Volume: 925 Issue: 2 Pages: 144-144
  • DOI: 10.3847/1538-4357/ac3d2e
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Exploring the 100 au Scale Structure of the Protobinary System NGC 2264 CMM3 with ALMA (2021)
  • Author(s): Shibayama Yoshiki、Watanabe Yoshimasa、Oya Yoko、Sakai Nami、Lopez-Sepulcre Ana、Liu Sheng-Yuan、Su Yu-Nung、Zhang Yichen、Sakai Takeshi、Hirota Tomoya、Yamamoto Satoshi
  • Journal Title: The Astrophysical Journal Volume: 918 Issue: 1 Pages: 32-32
  • DOI: 10.3847/1538-4357/ac0ef6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Molecular line search towards the flaring 6.7-GHz methanol masers of G24.33+0.13 and G359.62-0.24: rare maser transitions detected (2021)
  • Author(s): McCarthy T P、Orosz G、Ellingsen S P、Breen S L、Voronkov M A、Burns R A、Olech M、Yonekura Y、Hirota T、Hyland L J、Wolak P
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 509 Issue: 2 Pages: 1681-1689
  • DOI: 10.1093/mnras/stab3040
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Extraordinary Outburst in the Massive Protostellar System NGC 6334 I-MM1: Spatiokinematics of Water Masers during a Contemporaneous Flare Event (2021)
  • Author(s): Chibueze James O.、MacLeod Gordon C.、Vorster Jakobus M.、Hirota Tomoya、Brogan Crystal L.、Hunter Todd R.、van Rooyen Ruby
  • Journal Title: The Astrophysical Journal Volume: 908 Issue: 2 Pages: 175-175
  • DOI: 10.3847/1538-4357/abd474
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Water maser variability in a high-mass YSO outburst (2021)
  • Author(s): Hirota Tomoya、Cesaroni Riccardo、Moscadelli Luca、Sugiyama Koichiro、Burns Ross A.、Kim Jungha、Sunada Kazuyoshi、Yonekura Yoshinori
  • Journal Title: Astronomy & Astrophysics Volume: 647 Pages: A23-A23
  • DOI: 10.1051/0004-6361/202039798
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Formation and Evolution of Disks Around Young Stellar Objects (2020)
  • Author(s): Zhao Bo、Tomida Kengo、Hennebelle Patrick、Tobin John J.、Maury Anaelle、Hirota Tomoya、Sanchez-Monge Alvaro、Kuiper Rolf、Rosen Anna、Bhandare Asmita、Padovani Marco、Lee Yueh-Ning
  • Journal Title: Space Science Reviews Volume: 216 Issue: 3 Pages: 43-43
  • DOI: 10.1007/s11214-020-00664-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Multiple Outflows in the High-mass Cluster-forming Region G25.82-0.17 (2020)
  • Author(s): Kim Jungha、Kim Mi Kyoung、Hirota Tomoya、Kim Kee-Tae、Sugiyama Koichiro、Honma Mareki、Byun Do-young、Oh Chungsik、Motogi Kazuhito、Kang Jihyun、Kim Jeongsook、Liu Tie、Hu Bo、Burns Ross A.、Chibueze James O.、Matsumoto Naoko、Sunada Kazuyoshi
  • Journal Title: The Astrophysical Journal Volume: 896 Issue: 2 Pages: 127-127
  • DOI: 10.3847/1538-4357/ab9100
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Field Structure of Orion Source I (2020)
  • Author(s): Hirota Tomoya、Plambeck Richard L.、Wright Melvyn C. H.、Machida Masahiro N.、Matsushita Yuko、Motogi Kazuhito、Kim Mi Kyoung、Burns Ross A.、Honma Mareki
  • Journal Title: The Astrophysical Journal Volume: 896 Issue: 2 Pages: 157-157
  • DOI: 10.3847/1538-4357/ab959e
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The First VERA Astrometry Catalog (2020)
  • Author(s): Hirota Tomoya、VERA collaboration、他60名(1番目)
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 4 Pages: 50-50
  • DOI: 10.1093/pasj/psaa018
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] VEDA: VERA data analysis software for VLBI phase-referencing astrometry (2020)
  • Author(s): Nagayama Takumi、Hirota Tomoya、Honma Mareki、Kurayama Tomoharu、Adachi Yuuki、Tamura Yoshiaki、Kanya Yukitoshi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 4 Pages: 51-51
  • DOI: 10.1093/pasj/psaa044
  • Peer Reviewed
• [Journal Article] Performance of VERA in 10 micro-arcsecond astrometry (2020)
  • Author(s): Nagayama Takumi、Kobayashi Hideyuki、Hirota Tomoya、Honma Mareki、Jike Takaaki、Kim Mi Kyoung、Nakagawa Akiharu、Omodaka Toshihiro、Oyama Tomoaki、Sakai Daisuke、Shibata Katsunori M、Tamura Yoshiaki
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 72 Issue: 4 Pages: 52-52
  • DOI: 10.1093/pasj/psaa034
  • Peer Reviewed
• [Journal Article] Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks (2020)
  • Author(s): Tanaka Kei E. I.、Zhang Yichen、Hirota Tomoya、Sakai Nami、Motogi Kazuhito、Tomida Kengo、Tan Jonathan C.、Rosero Viviana、Higuchi Aya E.、Ohashi Satoshi、Liu Mengyao、Sugiyama Koichiro
  • Journal Title: The Astrophysical Journal Volume: 900 Issue: 1 Pages: 1-11
  • DOI: 10.3847/2041-8213/abadfc
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar (2020)
  • Author(s): Burns R. A.、Sugiyama K.、Hirota T.、Kim Kee-Tae、Sobolev A. M.、Stecklum B.、MacLeod G. C.、Yonekura Y.、Olech M.、Orosz G.、Ellingsen S. P.、Hyland L.、Caratti o Garatti A.、Brogan C.、Hunter T. R.、Phillips C.、van den Heever S. P.、Eisloffel J.、Linz H.、Surcis G.、Chibueze J. O.、Baan W.、Kramer B.
  • Journal Title: Nature Astronomy Volume: - Issue: 5 Pages: 506-510
  • DOI: 10.1038/s41550-019-0989-3
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observations of the Orion Source I Disk and Outflow Interface (2020)
  • Author(s): Wright Melvyn、Plambeck Richard、Hirota Tomoya、Ginsburg Adam、McGuire Brett、Bally John、Goddi Ciriaco
  • Journal Title: The Astrophysical Journal Volume: 889 Issue: 2 Pages: 155-155
  • DOI: 10.3847/1538-4357/ab5864
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 13CH3OH Masers Associated With a Transient Phenomenon in a High-mass Young Stellar Object (2020)
  • Author(s): Chen Xi、Hirota Tomoya、他23名(21番目)
  • Journal Title: The Astrophysical Journal Volume: 890 Issue: 2 Pages: L22-L22
  • DOI: 10.3847/2041-8213/ab72a5
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spatial Distribution of AlO in a High-mass Protostar Candidate Orion Source I (2019)
  • Author(s): Tachibana Shogo、Kamizuka Takafumi、Hirota Tomoya、Sakai Nami、Oya Yoko、Takigawa Aki、Yamamoto Satoshi
  • Journal Title: The Astrophysical Journal Volume: 875 Issue: 2 Pages: L29-L29
  • DOI: 10.3847/2041-8213/ab1653
  • NAID: 120006902789
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The First Bird’s-eye View of a Gravitationally Unstable Accretion Disk in High-mass Star Formation (2019)
  • Author(s): Motogi Kazuhito、Hirota Tomoya、Machida Masahiro N.、Yonekura Yoshinori、Honma Mareki、Takakuwa Shigehisa、Matsushita Satoki
  • Journal Title: The Astrophysical Journal Volume: 877 Issue: 2 Pages: 1-8
  • DOI: 10.3847/2041-8213/ab212f
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Sub-arcsecond (Sub)millimeter Imaging of the Massive Protocluster G358.93-0.03: Discovery of 14 New Methanol Maser Lines Associated with a Hot Core (2019)
  • Author(s): Brogan C. L.、Hirota T.、他26名(14番目)
  • Journal Title: The Astrophysical Journal Volume: 881 Issue: 2 Pages: L39-L39
  • DOI: 10.3847/2041-8213/ab2f8a
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] VLBI observations of the G25.65+1.05 water maser superburst (2019)
  • Author(s): Burns R A、Orosz G、Bayandina O、Surcis G、Olech M、MacLeod G、Volvach A、Rudnitskii G、Hirota T、Immer K、Blanchard J、Marcote B、van Langevelde H J、Chibueze J O、Sugiyama K、Kim Kee-Tae、Val‘tts I、Shakhvorostova N、Kramer B、Baan W A、Brogan C、Hunter T、Kurtz S、Sobolev A M、Brand J、Volvach L
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 491 Issue: 3 Pages: 4069-4075
  • DOI: 10.1093/mnras/stz3172
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Extremely High Excitation SiO Lines in Disk-Out ow System in Orion Source I (2019)
  • Author(s): Kim, M. K., Hirota, T., Machida, M. N., Matsushita, Y., Motogi, K., Matsumoto, N., Burns, R. A., Honma, M.,
  • Journal Title: The Astrophysical Journal Volume: 872 Issue: 1 Pages: 64-64
  • DOI: 10.3847/1538-4357/aafb6b
  • Peer Reviewed
• [Journal Article] Recent progress in high-mass star-formation studies with ALMA (2018)
  • Author(s): Hirota Tomoya
  • Journal Title: Publications of the Korean Astronomical Society Volume: 33 Pages: 21-30
  • Peer Reviewed / Open Access
• [Journal Article] ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules (2018)
  • Author(s): Sakai Takeshi、Yanagida Takahiro、Furuya Kenji、Aikawa Yuri、Sanhueza Patricio、Sakai Nami、Hirota Tomoya、Jackson James M.、Yamamoto Satoshi
  • Journal Title: The Astrophysical Journal Volume: 857 Issue: 1 Pages: 35-35
  • DOI: 10.3847/1538-4357/aaadfd
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] "The Difference in Abundances between N-bearing and O-bearing Species in High-Mass Star-Forming Regions (2018)
  • Author(s): Suzuki, T., Ohishi, M., Saito, M., Hirota, T., Majumdar, L., Wakelam, V.
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 237 Issue: 1 Pages: 3-3
  • DOI: 10.3847/1538-4365/aac8db
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] An Expanded Gas-Grain Model for Interstellar Glycine (2018)
  • Author(s): Suzuki, T., Ohishi, M., Saito, M., Hirota, T., Majumdar, L., Wakelam, V.
  • Journal Title: The Astrophysical Journal Volume: 865 Issue: 1 Pages: 51-51
  • DOI: 10.3847/1538-4357/aad087
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] "Chemical Diversity in Three Hot Cores associated with the 6.7 GHz CH3OH Masers (2018)
  • Author(s): Taniguchi, K., Saito, M., Majumdar, L., Shimoikura, T., Dobashi, K., Ozeki, H., Nakamura, F., Hirota, T., Minamidani, T., Miyamoto, Y., Kaneko, H.
  • Journal Title: The Astrophysical Journal Volume: 866 Issue: 2 Pages: 150-150
  • DOI: 10.3847/1538-4357/aade97
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] "The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Flaring of the Water Masers in a North-South Bipolar Out ow Driven by MM1B (2018)
  • Author(s): Brogan, C. L., Hunter, T. R., Cyganowski, C. J., Chibueze, J. O., Friesen, R. K., Hirota, T., MacLeod, G. C., McGuire, B. A., Sobolev, A. M.
  • Journal Title: The Astrophysical Journal Volume: 866 Issue: 2 Pages: 87-87
  • DOI: 10.3847/1538-4357/aae151
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Compressed magnetic field in the magnetically-regulated global collapsing clump of G9.62+0.19 (2018)
  • Author(s): Liu, T., Kim, K. T., Liu, S. -Y., Juvela, M., Zhang, Q., Wu, Y., Li, P. S., Parsons, H., Soam, A., Goldsmith, P. F., Su, Y. -N., Tatematsu, K., Qin, S. L., Garay, G., Hirota, T., Wouterloot, J., Chen, H. -R., Evans, N. J., II, Graves, S., Kang, S. -J., Li, D., Mardones, D., Rawlings, M. G., Ren, Z., Wang, K.
  • Journal Title: Astrophysical Journal Letters Volume: 869 Issue: 1 Pages: L5-L5
  • DOI: 10.3847/2041-8213/aaf19e
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] "Science with a Next-Generation Very Large Array: Understanding Massive Star Formation through Maser Imaging (2018)
  • Author(s): Hunter, T. R., Brogan, C. L., Bartkiewicz, A., Chibueze, J. O., Cyganowski, C. J., Hirota, T., MacLeod, G. C., Sanna, A., Torrelles, J. M.
  • Journal Title: ASP Conference Series Monograph Volume: 7 Pages: 321-331
  • Open Access / Int'l Joint Research
• [Journal Article] The Extraordinary Outburst in the Massive Protostellar System NGC 6334I-MM1: Emergence of Strong 6.7 GHz Methanol Masers (2018)
  • Author(s): Hunter T. R.、Brogan C. L.、MacLeod G. C.、Cyganowski C. J.、Chibueze J. O.、Friesen R.、Hirota T.、Smits D. P.、Chandler C. J.、Indebetouw R.
  • Journal Title: The Astrophysical Journal Volume: 854 Issue: 2 Pages: 170-170
  • DOI: 10.3847/1538-4357/aaa962
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Statistical Study of Massive Cluster-forming Clumps (2018)
  • Author(s): Shimoikura Tomomi、Dobashi Kazuhito、Nakamura Fumitaka、Matsumoto Tomoaki、Hirota Tomoya
  • Journal Title: The Astrophysical Journal Volume: 855 Issue: 1 Pages: 45-45
  • DOI: 10.3847/1538-4357/aaaccd
  • Peer Reviewed / Open Access
• [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] Disk-driven rotating bipolar outflow in Orion Source I (2017)
  • Author(s): 10.Hirota, T. *, Machida, M. N., Matsushita, Y., Motogi, K., Matsumoto, N., Kim, M. K., Burns, R. A., Honma, M.
  • Journal Title: Nature Astronomy Volume: 1 Issue: 7 Pages: 0146-0146
  • DOI: 10.1038/s41550-017-0146
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] ALMA Observations of the Archetypal “Hot Core” That Is Not: Orion-KL (2017)
  • Author(s): Orozco-Aguilera M. T.、Zapata Luis A.、Hirota Tomoya、Qin Sheng-Li、Masque Josep M
  • Journal Title: The Astrophysical Journal Volume: 847 Issue: 1 Pages: 66-66
  • DOI: 10.3847/1538-4357/aa88cd
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Face-on Accretion System in High-mass Star Formation: Possible Dusty Infall Streams within 100 AU (2017)
  • Author(s): Motogi Kazuhito、Hirota Tomoya、Sorai Kazuo、Yonekura Yoshinori、Sugiyama Koichiro、Honma Mareki、Niinuma Kotaro、Hachisuka Kazuya、Fujisawa Kenta、Walsh Andrew J.
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 1 Pages: 23-23
  • DOI: 10.3847/1538-4357/aa8d75
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observations of Cyanopolyynes toward Four High-mass Star-forming Regions Containing Hot Cores (2017)
  • Author(s): Taniguchi Kotomi、Saito Masao、Hirota Tomoya、Ozeki Hiroyuki、Miyamoto Yusuke、Kaneko Hiroyuki、Minamidani Tetsuhiro、Shimoikura Tomomi、Nakamura Fumitaka、Dobashi Kazuhito
  • Journal Title: The Astrophysical Journal Volume: 844 Issue: 1 Pages: 68-68
  • DOI: 10.3847/1538-4357/aa7899
  • Peer Reviewed
• [Journal Article] Discovery of Striking Difference of Molecular-emission-line Richness in the Potential Proto-binary System NGC 2264 CMM3 (2017)
  • Author(s): Watanabe Yoshimasa、Sakai Nami、Lopez-Sepulcre Ana、Sakai Takeshi、Hirota Tomoya、Liu Sheng-Yuan、Su Yu-Nung、Yamamoto Satoshi
  • Journal Title: The Astrophysical Journal Volume: 847 Issue: 2 Pages: 108-108
  • DOI: 10.3847/1538-4357/aa88b6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex (2017)
  • Author(s): Liu Tie、Lacy John、Li Pak Shing、Wang Ke、Qin Sheng-Li、Zhang Qizhou、Kim Kee-Tae、Garay Guido、Wu Yuefang、Mardones Diego、Zhu Qingfeng、Tatematsu Ken’ichi、Hirota Tomoya、Ren Zhiyuan、Liu Sheng-Yuan、Chen Huei-Ru、Su Yu-Nung、Li Di
  • Journal Title: The Astrophysical Journal Volume: 849 Issue: 1 Pages: 25-25
  • DOI: 10.3847/1538-4357/aa8d73
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 大質量原始星候補天体Orion Source IにおけるALMAバンド10連続波観測" (2022)
  • Author(s): 廣田朋也、本間希樹、松下祐子、Burns, Ross A.、町田正博、元木業人、金美京
  • Organizer: 日本天文学会春季年会
• [Presentation] 科学報告「星惑星形成」 (2021)
  • Author(s): 廣田朋也
  • Organizer: Japan SKA Consortium Science Strategy Workshop 2021
  • Invited
• [Presentation] Some specific science cases for star-planet formation studies with SKA and ngVLA (2021)
  • Author(s): 廣田朋也
  • Organizer: Linking the science of large interferometers in the 2030s
  • Invited
• [Presentation] VERAサイエンスの現状と将来 (2021)
  • Author(s): 廣田朋也
  • Organizer: 2021年度 VLBI 懇談会シンポジウム「国内VLBIの現在地を知る」
• [Presentation] ミリ波サブミリ波メーザーによる星形成研究の可能性 (2021)
  • Author(s): 廣田朋也
  • Organizer: アルマワークショップ 2021「ALMAによるミリ波/サブミリ波VLBIのサイエンス」
• [Presentation] Basics of proposal writing (2021)
  • Author(s): 廣田朋也
  • Organizer: 分子雲から原始星誕生までを追う~新時代の星形成モデル構築に向けて~
  • Invited
• [Presentation] Recent astrometry results from VERA project (2021)
  • Author(s): Hirota, Tomoya
  • Organizer: The 13th East Asian VLBI Worksop 2021
  • Int'l Joint Research
• [Presentation] ALMA Band 10 imaging of Orion Source I (2021)
  • Author(s): 廣田朋也
  • Organizer: ALMA高周波バンドを用いた星形成研究を考える
• [Presentation] VERAとALMAを用いた大質量原始星S255~NIRS~3における水メーザー観測 (2021)
  • Author(s): 廣田朋也、Burns, Ross A.、砂田和良、Cesaroni, Riccardo、Moscadelli, Luca、杉山孝一郎、Kim, Jungha、米倉覚則
  • Organizer: 日本天文学会春季年会
• [Presentation] VERAによる位置天文データのカタログ作成 (2020)
  • Author(s): 廣田朋也、VERA collaboration
  • Organizer: 日本天文学会秋季年会
• [Presentation] VERAの科学的成果の報告 (2020)
  • Author(s): 廣田朋也
  • Organizer: VERAユーザーズミーティング
• [Presentation] VERAサイエンスの現状と将来 (2020)
  • Author(s): 廣田朋也
  • Organizer: 2020年度 VLBI 懇談会シンポジウム「VLBIの未来」
• [Presentation] SKA-VLBI による高感度・高分解能観測の検討 (2020)
  • Author(s): 廣田朋也
  • Organizer: 大質量星形成ワークショップ2020「大質量星 形成研究の現状と次世代観測装置へ向けた展望」
  • Invited
• [Presentation] Progress of Italy-Japan collaboration on high-mass star-formation studies (2019)
  • Author(s): Hirota, T.
  • Organizer: Eating VLBI Workshop 2019
  • Int'l Joint Research / Invited
• [Presentation] Possible science cases for the cradle of life with SKA (2019)
  • Author(s): Hirota, T.
  • Organizer: East Asia SKA Science Workshop 2019
  • Int'l Joint Research / Invited
• [Presentation] High frequency H2O and SiO line observations in Orion Source I (2019)
  • Author(s): Hirota, T.
  • Organizer: East Asian ALMA Development Workshop
  • Int'l Joint Research / Invited
• [Presentation] High resolution ALMA observations of Orion Source I (2019)
  • Author(s): Hirota, T.
  • Organizer: Orion Uncovered
  • Int'l Joint Research
• [Presentation] SKA-VLBI による高感度・高分解能観測の検討 (2019)
  • Author(s): 廣田朋也
  • Organizer: SKA-Japan シンポジウム2019
• [Presentation] オリオンKL 電波源I における一酸化ケイ素メーザーの偏波観測 (2019)
  • Author(s): 廣田朋也、Plambeck, Richard, L., Wright, Melvyn, C. H., 町田正博、松下祐子、元木業人、金美京、Burns, Ross A.、本間希樹
  • Organizer: 日本天文学会秋季年会
• [Presentation] KaVA Large Program for Star-formation (2019)
  • Author(s): Hirota, T.
  • Organizer: The 12th East Asian VLBI Worksop
  • Int'l Joint Research
• [Presentation] Sciences with VERA and future developments to SKA (2019)
  • Author(s): Hirota, T.
  • Organizer: SKA General Science Meeting and Key Science Workshop 2019
  • Int'l Joint Research
• [Presentation] High resolution observational studies of star-formation (2019)
  • Author(s): Hirota Tomoya
  • Organizer: Special Colloquium on Radio Astronomy
  • Int'l Joint Research / Invited
• [Presentation] "High-frequency/High-resolution observations of High-mass young stellar objects with ALMA and VLBI (2019)
  • Author(s): Hirota Tomoya
  • Organizer: Star formation with ALMA: Evolution from molecular clouds to protostars
  • Int'l Joint Research / Invited
• [Presentation] Recent progress in high-mass star-formation studies (2018)
  • Author(s): Hirota Tomoya
  • Organizer: The Cosmic Cycle of Dust and Gas in the Galaxy: From Old to Young Stars
  • Int'l Joint Research / Invited
• [Presentation] KaVA Large Proposal for High-Mass Star-Formation Studies with Multiple Masers (2018)
  • Author(s): Hirota Tomoya
  • Organizer: The 14th European VLBI Network Symposium and EVN Users Meeting
  • Int'l Joint Research
• [Presentation] Status of KaVA SFRs WG (2018)
  • Author(s): Hirota Tomoya
  • Organizer: EAST ASIAN VLBI WORKSHOP 2018
  • Int'l Joint Research
• [Presentation] Future KaVA+TNRT (or extended EAVN) for Star-formation Studies (2018)
  • Author(s): Hirota Tomoya
  • Organizer: NARIT- Key Science Workshop: Masers & Molecular Lines in Radio Astronomy
  • Int'l Joint Research / Invited
• [Presentation] Molecular line view in the heart of Orion Nebula (2018)
  • Author(s): Hirota Tomoya
  • Organizer: NARIT-SOKENDAI Winter School 2018; Astropysical Masers & Molecular Lines in Radio Astronomy
  • Int'l Joint Research / Invited
• [Presentation] High Resolution Observations of Orion Source I (2018)
  • Author(s): Hirota Tomoya
  • Organizer: High Mass Star Formation Workshop 2018
  • Int'l Joint Research / Invited
• [Presentation] Orion KL 電波源Iにおける高励起一酸化ケイ素分子・水分子輝線の放射機構と物理的環境 (2018)
  • Author(s): 廣田朋也、町田正博、松下祐子、元木業人、松本尚子、金美京、Burns, Ross A.、本間希樹
  • Organizer: 日本天文学会春季年会
• [Presentation] Recent progress in high-mass star-formation studies with ALMA (2017)
  • Author(s): Hirota Tomoya
  • Organizer: East- Asia ALMA Science Workshop 2017
  • Int'l Joint Research / Invited
• [Presentation] Understanding high-mass star formation through KaVA observations of water and methanol masers (2) Second year (2017)
  • Author(s): Hirota Tomoya, Kim Kee-Tae
  • Organizer: KaVA/EAVN Joint Science Working Group Meeting
  • Int'l Joint Research
• [Presentation] ALMA observations of submillimeter H2O and SiO lines in Orion Source I (2017)
  • Author(s): Hirota, T., Machida, M. N., Matsushita, Y., Motogi, K., Matsumoto, N., Kim, M. K., Burns, R. A., Honma, M.
  • Organizer: IAU Symposium 336, "Astrophysical Masers: Unlocking the Mysteries of the Universe"
  • Int'l Joint Research
• [Presentation] Understanding high-mass star formation through KaVA observations of water and methanol masers (2017)
  • Author(s): Hirota, T., Kim, K. T., KaVA Star Formation Science Working Group
  • Organizer: Asia Pacific Regional IAU (In- ternational Astronomical Union) Meeting
  • Int'l Joint Research
• [Presentation] Observations of submillimeter H2O and SiO lines in Orion KL region (2017)
  • Author(s): Hirota Tomoya
  • Organizer: Symposium "Evolution of Molecules in Space"
  • Int'l Joint Research
• [Remarks] 日韓VLBIネットワークKaVAによる星形成大規模観測プログラム初成果
  • URL: https://www.miz.nao.ac.jp/veraserver/hilight/20200729_kavasfr/index.html
• [Remarks] The First Results from the KaVA (以下略)
  • URL: https://www.miz.nao.ac.jp/veraserver/hilight/20200729_kavasfr/index-e.html
• [Remarks] VERAプロジェクト20年の成果がまとまる
  • URL: https://www.miz.nao.ac.jp/veraserver/hilight/20201125_catalog/
• [Remarks] Earth Faster, Closer to Black Hole (以下略)
  • URL: https://www.miz.nao.ac.jp/veraserver/hilight/20201125_catalog/index-e.html
• [Remarks] 重い原始星が吐き出す「熱の波」(英語版)
  • URL: http://www.miz.nao.ac.jp/en/content/news/topic/20200114-370
• [Remarks] 重い原始星が吐き出す「熱の波」
  • URL: http://www.miz.nao.ac.jp/content/news/topic/20200114-368
• [Remarks] Maser Monitoring Organisation
  • URL: https://www.masermonitoring.com
• [Remarks] KaVA Large Program
  • URL: https://radio.kasi.re.kr/kava/large_programs.php#sh3
• [Remarks] 産声から探る巨大赤ちゃん星の成長
  • URL: http://veraserver.mtk.nao.ac.jp/hilight/2017_hirota.html
• [Remarks] 産声から探る巨大赤ちゃん星の成長
  • URL: https://alma-telescope.jp/news/press/orion-201706
• [Remarks] ALMA Hears Birth Cry of a Massive Baby Star
  • URL: https://alma-telescope.jp/en/news/press/orion-201706
• [Remarks] KaVA Large Programs
  • URL: https://radio.kasi.re.kr/kava/large_programs.php#sh3