Study of precise radial velocity measurements of stars orbiting around a supermassive black hole, to investigate space-time structure around the black hole
| Project/Area Number |
15K13463
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | Miyagi University of Education |
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Principal Investigator |
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| Research Collaborator |
NAGATOMO Schun
GORIN Haruka
TAKAHASHI Mizuki
IWAMATSU Atsushi
SAIDA Hiromi
ZENKO Tetsuya
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | 天文学 / ブラックホール / 赤外線 / 分光 / 相対性理論 / 星 / ドップラー効果 |
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| Outline of Final Research Achievements |
The purpose of this project is to study how to measure radial velocities of stars orbiting around the supermassive black hole at the center of our Galaxy. Observations of the orbiting stars allow us to investigate the detailed gravitational field around the black hole, and to detect relativistic effects from the black hole.
We have been studied observation and data analysis methods using the Subaru telescope. We have observed one of the orbiting stars every year during this project, using an infrared camera IRCS. It has become possible to measure the radial velocity of the star better than 20 km/s. The star had been frequently monitored in 2018, during its closest approach to the supermassive black hole, and we have succeeded to detect special and general relativistic effects from the supermassive black hole.
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| Academic Significance and Societal Importance of the Research Achievements |
最も重要な本研究の成果は、「巨大ブラックホールによる相対論効果を検出」し、「巨大ブラックホール近傍の強い重力場を記述する重力理論として、一般相対性理論が、ニュートンの重力理論よりも正しいことを定量的に示した」点にある。ブラックホールを周回する星を観測することで、強い重力場の中を動く質点の運動を調べることが可能となった。という、このような重力場は、地球上では再現できない。そのような強い重力場の実験場で、ニュートンの重力理論では説明のできない現象を観測した。その結果、ブラックホール周囲の時空は、ニュートンの重力理論ではなく一般相対性理論によって記述されることが明らかになった。
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Report
(5 results)
Research Products
(62 results)
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[Journal Article] The infrared Doppler (IRD) instrument for the Subaru telescope: instrument description and commissioning results2018
Author(s)
T. Kotani, M. Tamura, J. Nishikawa, A. Ueda, M. Kuzuhara, M. Omiya, J. Hashimoto, M. Ishizuka, T. Hirano, H. Suto, T. Kurokawa, T. Kokubo, T. Mori, Y. Tanaka, K. Kashiwagi, M. Konishi, T. Kudo, B. Sato, S. Jacobson, K. W. Hodapp, D. B. Hall, W. Aoki, T. Usuda, S. Nishiyama, et al.
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Journal Title
Proceedings of the SPIE
Volume: 10702
Pages: 11-18
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Radial velocity measurements of an orbiting star around Sgr A*2018
Author(s)
Shogo Nishiyama Hiromi Saida Yohsuke Takamori Masaaki Takahashi Rainer Schdel Francisco Najarro Satoshi Hamano Masashi Omiya Motohide Tamura Mizuki Takahashi Haruka Gorin Schun Nagatomo Tetsuya Nagata
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 70
Issue: 4
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Star formation history and metallicity in the Galactic inner bulge revealed by the red giant branch bump2018
Author(s)
F. Nogueras-Lara, R. Schoedel, H. Dong, F. Najarro, A. T. Gallego-Calvente, M. Hilker, E. Gallego-Cano, S. Nishiyama, N. Neumayer, A. Feldmeier-Krause, J. H. V. Girard, S. Cassisi, A. Pietrinferni
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Journal Title
Astronomy & Astrophysics
Volume: 620
Pages: A83-A83
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] A lack of classical Cepheids in the inner part of the Galactic disc2016
Author(s)
Matsunaga, N., Feast, M. W., Bono, G., Kobayashi, N., Inno, L., Nagayama, T., Nishiyama, S., Matsuoka, Y., and Nagata, T.
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 462
Issue: 1
Pages: 414-420
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] V5852 Sgr: an unusual nova possibly associated with the Sagittarius stream2016
Author(s)
E. Aydi, P. Mroz, P. A. Whitelock, S. Mohamed, L. Wyrzykowski, A. Udalski, P. Vaisanen, T. Nagayama, M. Dominik, A. Scholz, H. Onozato, R. E. Williams, S. T. Hodgkin, S. Nishiyama, M. Yamagishi, A. M. S. Smith, T. Ryu, A. Iwamatsu, I. Kawamata
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Journal Title
Monthly Notices of the Royal Astronomical Society
Volume: 461
Issue: 2
Pages: 1529-1538
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] 銀河系中心巨大BHを巡る星S0-2/S2 の研究3：すばる視線速度モニター観測 2018 の解析状況2019
Author(s)
西山正吾, 斉田浩見, 大神隆幸, 孝森洋介, 高橋真聡, R. Schoedel, F. Najarro, 濱野哲史, 五林 遥, 大橋遥介, 小山晃徳, 唐朋央, 雨宮竜登, 岩松篤史, 高橋美月, 大宮正士, 長田哲也, 長友竣, 善光哲哉, 田村元秀, 美濃和陽典
Organizer
日本天文学会春季年会
Related Report
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[Presentation] 銀河系中心巨大BHを巡る星S2 の研究1：すばる視線速度モニター観測の現状2018
Author(s)
西山正吾, 斉田浩見, 孝森洋介, 高橋真聡, R. Schoedel, F. Najarro, 濱野哲史, 五林遥, 大橋遥介, 小山 晃徳, 唐朋央, 岩松篤史, 高橋美月, 大宮正士, 長田哲也, 長友 竣, 善光哲哉, 田村元秀, 美濃和陽典
Organizer
日本天文学会秋季年会
Related Report
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[Presentation] IR-TMT と位置天文衛星の距離データを用いたレッドクランプ星の絶対等級 の決定2018
Author(s)
小野里宏樹, 板由房, 森田亮介, 幅崎裕太, 市川隆, 花上拓海, 小宮山貴洋, 岩松篤史, 筒井 寛典, 柳澤顕史, 泉浦秀行, 中田好一, 西山正吾
Organizer
日本天文学会秋季年会
Related Report
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