2011 Fiscal Year Final Research Report
Sub-mm VLBI observations of the event horizon of the super-massive black hole at the Galaxy center
| Project/Area Number |
21244019
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
HONMA Mareki 国立天文台, 水沢VLBI観測所, 准教授 (20332166)
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| Co-Investigator(Kenkyū-buntansha) |
KAWABE Ryohei 国立天文台, 野辺山宇宙電波観測所, 教授 (10195141)
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| Co-Investigator(Renkei-kenkyūsha) |
KAWAGUCHI Noriyuki 国立天文台, 水沢VLBI観測所, 教授 (90214618)
OYAMA Tomoaki 国立天文台, 水沢VLBI観測所, 研究員 (70425403)
KONO Yusuke 国立天文台, 水沢VLBI観測所, 助教 (00370106)
KOHNO Kotaro 東京大学, 天文学教育研究センター, 教授 (80321587)
EZAWA Hajime 国立天文台, チリ観測所, 助教 (60321585)
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| Research Collaborator |
AKIYAMA Kazunori 東京大学, 理学系研究科, 大学院生
NAGAI Hiroshi 国立天文台, チリ観測所, 研究員
HADA Kazuhiro 総合研究大学院大学, 物理科学科, 大学院生
OGAWA Hideo 大阪府立大学, 理学部, 特任教授
KIMURA Kimihiro 大阪府立大学, 理学部, 研究員
IWASHITA Hiroyuki 国立天文台, 野辺山宇宙電波観測所, 研究技師
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| Project Period (FY) |
2009 – 2011
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| Keywords | ブラックホール / サブミリ波 / VLBI / 事象の地平線 / 銀河系中心 |
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| Research Abstract |
In order to build a sub-mm VLBI array which is capable of resolving the event horizon scale of super-massive black holes, we have equipped ASTE telescope in Chile with instruments necessary for conducting sub-mm VLBI observations. Based on this, we have conducted international sub-mm VLBI observations including Chilean station for the first time. While fringes are yet to be detected with Chilean baselines and the results only provide an upper limit on the flux and brightness temperature of the source, based on observations with other baselines we have detected short-term variability of Sgr A in a scale of a few tens of the event horizon, providing us a new clue to understand detailed structures in the vicinity of the super-massive black hole.
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