X-ray spectral and polarimetric study on rapid variability of black holes
Project/Area Number |
24740129
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Astronomy
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Research Institution | Institute of Physical and Chemical Research |
Principal Investigator |
SHINYA Yamada 独立行政法人理化学研究所, 仁科加速器研究センター, 基礎科学特別研究員 (40612073)
|
Project Period (FY) |
2012-04-01 – 2014-03-31
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Project Status |
Completed (Fiscal Year 2013)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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Keywords | ブラックホール / 宇宙 / X線 / X線分光 / X線偏光 / 宇宙X線衛星 |
Research Abstract |
Our aim is to understand general relativistic accretion flow around a black hole by observing X-ray binaries of a black hole. We have analyzed a famous black hole binary, Cygnus X-1, using Suzaku X-ray observatory in the low/hard were conducted in a model-independent manner. Variations on short (seconds) and long (days to months) time scales require a constant component localized below 2 keV, a broad soft one dominating in the 2-10 keV range, and a hard one mostly seen in 10-300 keV range. These are respectively interpreted as emission from the truncated cool disk, a soft Compton component, and a hard Compton component in view of the truncated disk/hot inner flow picture. Long-term spectral evolution can be produced by the constant disk increasing in temperature and luminosity as the truncation radius decreases. Furthermore, we found highly ionized Fe-K absorption lines, which can be a probe of accretion geometry.
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Report
(3 results)
Research Products
(15 results)
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[Journal Article] Evidence for a Cool Disk and Inhomogeneous Coronae from Wide-band Temporal Spectroscopy of Cygnus X-1 with Suzaku2013
Author(s)
Yamada, S., Makishima, K., Done, C., Torii, S., Noda, H., Sakurai, S.
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Journal Title
Publications of the Astronomical Society of Japan
Volume: Vol.65, No.4
Pages: 80-80
Related Report
Peer Reviewed
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[Journal Article] Rapid Spectral Changes of Cyg X-1 in the Low/Hard State with Suzaku2013
Author(s)
Yamada, S., Negoro, H., Torii, S., Noda, H., Mineshige, S. & Makishima, K
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Journal Title
Astrophy.J.Lett.767
Volume: id. L34
Issue: 2
Pages: 5-5
DOI
Related Report
Peer Reviewed
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[Journal Article] Highly Ionized Fe-K Absorption Line from Cygnus X-1 in the High/Soft State Observed with Suzaku2013
Author(s)
Yamada, S., Torii, S., Mineshige, S., Ueda, Y., Kubota, A., Gandhi, P., Makishima, K. (他3名)
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Journal Title
The Astrophysical Journal Letters
Volume: Volume 767, Issue 2
Related Report
Peer Reviewed
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[Journal Article] Evidence for a Cool Disk and Inhomogeneous Coronae from Wide-band Temporal Spectroscopy of CygX-1 with Suzaku2013
Author(s)
Yamada, S., Makishima, K., Done, C., Torii, S., Noda, H. & Sakurai, S
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Journal Title
Publ. Astron. Soc. Japan 65
Volume: ID 80
Issue: 4
Pages: 21-21
DOI
Related Report
Peer Reviewed
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[Journal Article] Data-Oriented Diagnostics of Pileup Effects on the Suzaku XIS2012
Author(s)
Yamada, S., Uchiyama, H., Dotani, T., Tsujimoto, M., Katsuda, S., Makishima, K., (他7名)
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Journal Title
Publications of the Astronomical Society of Japan
Volume: Vol.64, 3
Issue: 3
Pages: 53-12
DOI
Related Report
Peer Reviewed
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