2016 Fiscal Year Final Research Report
Monitoring observation of near-infrared flares from supermassive black hole caused by gas accretion
| Project/Area Number |
25707012
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | Miyagi University of Education (2014-2016)
National Astronomical Observatory of Japan (2013) |
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Principal Investigator |
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| Research Collaborator |
IWAMATSU Atsushi
KAWAMATA Ikumi
ONOZATO Hiroki
ADACHI Rina
SEKI Megumi
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 赤外線天文学 / ブラックホール / 銀河系 / 銀河中心核 |
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| Outline of Final Research Achievements |
We have carried out near-infrared monitoring observations of the Galactic supermassive black hole, using the IRSF telescope in South Africa. The closest approach of a gas cloud to the supermassive black hole was in around March/April 2013, and flares from the black hole was expected. However, during our monitoring from 2013 to 2015, no clear flaring was detected. The K-band magnitudes of the black hole are fainter than 12 during the period. Our result is consistent with other monitoring observations in radio and X-ray wavelengths.
Using the same data sets, we have searched for variable stars in the central 7 arcmin region of our Galaxy. We have found new variable star candidates: 10 Mira variable stars, and one Cepheid variable. They are previously unknown variable stars.
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| Free Research Field |
赤外線天文学
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