X-ray spectral study of blackhole accretion disks

• Project/Area Number: 19740113
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Shibaura Institute of Technology
• Principal Investigator: KUBOTA Aya Shibaura Institute of Technology, システム理工学部, 准教授 (00391938)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥3,700,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥600,000); Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2007: ¥1,100,000 (Direct Cost: ¥1,100,000)
• Keywords: X線天文学 / ブラックホール / 降着円盤 / 質量降着 / 質量放出 / 「すざく」衛星 / X線天文 / モデル計算

Research Abstract

Accretion disks around blackholes emit X-ray into the space. We utilized the Suzaku wide band data of several black holes, and evaluated how gravitational energy was released around black holes. We also calculated theoretical (optically thick) accretion disk models, which take disk vertical structure into account, and tested them with the Suzaku data of a high state black hole. Then we found that there is a missing key parameter, which plays an important role in the disk vertical structure.

Research Products

• [Journal Article] Testing Accretion Disk Structure with Suzaku Data of LMC X-3 (2010)
  • Author(s): Kubota, Aya, Done Chris, Davis Shane W., Dotani Tadayasu, Mizuno Tsunefumi, Ueda Yoshihiro
  • Journal Title: The Astrophysical Journal 714 Pages: 860-867
  • Peer Reviewed
• [Journal Article] TESTING ACCRETION DISK STRUCTURE WITH SUZAKU DATA OF LMC X-3 (2010)
  • Author(s): Aya Kubota, Chris Done, Shane W. Davis, Tadayasu Dotani, Tsunefumi Mizuno、 Yoshihiro Ueda
  • Journal Title: The Astrophysical Journal 714 Pages: 860-867
  • Peer Reviewed
• [Journal Article] Is the Black Hole in GX 339-4 Really Spinning Rapidly? (2009)
  • Author(s): Yamada, S.; Makishima, K.; Uehara, Y.; Nakazawa, K.; Takahashi, H.; Dotani, T.; Ueda, Y.; Ebisawa, K.; Kubota, A.; Gandhi, P.
  • Journal Title: The Astrophysical Journal Letters, Volume 707 2 Pages: L109-L113
  • Peer Reviewed
• [Journal Article] X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku (2009)
  • Author(s): Terashima, Yuichi; Gallo, Luigi C.; Inoue, Hirohiko; Markowitz, Alex G.; Reeves, James N.; Anabuki, Naohisa; Fabian, Andrew C.; Griffiths, Richard E.; Hayashida, Kiyoshi; Itoh, Takeshi; Kokubun, Norihide; Kubota, Aya; Miniutti, Giovanni; Takahashi, Tadayuki; Yamauchi, Makoto; Yonetoku, Daisuke
  • Journal Title: Publications of the Astronomical Society of Japan Vol.61,No.SP1 Pages: S299-S316
  • Peer Reviewed
• [Journal Article] Spectral Transitions of an Ultraluminous X-Ray Source, NGC 2403 Source 3 (2009)
  • Author(s): Isobe, Naoki; Makishima, Kazuo; Takahashi, Hiromitsu; Mizuno, Tsunefumi; Miyawaki, Ryouhei; Gandhi, Poshak; Kawaharada, Madoka; Senda, Atsushi; Yoshida, Tessei; Kubota, Aya; Kobori, Hiroshi
  • Journal Title: Publicatio/s of the Astronomical Society of Japan Vol.61,No.SP1 Pages: S279-S289
  • Peer Reviewed
• [Journal Article] Suzaku Observations of M 82 X-1: Detection of a Curved Hard X-Ray Spectrum (2009)
  • Author(s): Miyawaki, Ryohei; Makishima, Kazuo; Yamada, Shin'ya; Gandhi, Poshak; Mizuno, Tsunefumi; Kubota, Aya; Tsuru, Takeshi G.; Matsumoto, Hironori
  • Journal Title: Publications of the Astronomical Society of Japan Vol.61,No.SP1 Pages: S263-S278
  • Peer Reviewed
• [Journal Article] Is the Black Hole in GX 339-4 Really Spinning Rapidly? (2009)
  • Author(s): Yamada, S、Makishima, K., Uehara, Y., Nakazawa, K., Takahashi, H., Dotani, T., Ueda, Y., Ebisawa, K., Kubota, A., Gandhi, P.
  • Journal Title: The Astrophysical Journal Letters 707 Pages: L109-L113
  • Peer Reviewed
• [Journal Article] Suzaku Observations of M 82 X-1 : Detection of a Curved Hard X-Ray Spectrum (2009)
  • Author(s): Miyawaki, Makishima, Yamada, Gandhi, Mizuno, Kubota, et.al.
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 263-278
  • Peer Reviewed
• [Journal Article] Spectral Transitions of an Ultraluminous X-Ray Source, NGC 2403 Source 3 (2009)
  • Author(s): Isobe, et.al.
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 279-289
  • Peer Reviewed
• [Journal Article] X-Ray Spectral Variability of the Seyfert Galaxy NGC 4051 Observed with Suzaku (2009)
  • Author(s): Terashima, et.al.
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 299-316
  • Peer Reviewed
• [Journal Article] The CALET mission on the ISS (2008)
  • Author(s): Torii S., (32名), Kubota, A, (他46名)
  • Journal Title: Proceedings of the SPIE 7021 Pages: 702114-702114-11
• [Journal Article] Suzaku Results on Cygnus X-1 in the Low/Hard State (2008)
  • Author(s): Makishima, Kazuo; Takahashi, Hiromitsu; Yamada, Shin'ya; Done, Chris; Kubota, Aya; Dotani, Tadayasu; Ebisawa, Ken; Itoh, Takeshi; Kitamoto, Shunji; Negoro, Hitoshi; Ueda, Yoshihiro; Yamaoka, Kazutaka;
  • Journal Title: Publications of the Astronomical Society of Japan Vol.60,No.3 Pages: 585-604
  • Peer Reviewed
• [Journal Article] Discovery of a Bright Transient Ultraluminous X-Ray Source, Suzaku J1305-4931 in NGC4945 (2008)
  • Author(s): Isobe, Naoki; Kubota, Aya; Makishima, Kazuo; Gandhi, Poshak; Griffiths, Richard E.; Dewangan, Gulab C.; Itoh, Takeshi; Mizuno, Tsunefumi
  • Journal Title: Publications of the Astronomical Society of Japan Vol.60,No.SP1 Pages: S241-S250
  • Peer Reviewed
• [Journal Article] Suzaku Results on Cygnus X-1 in the Low/Hard State (2008)
  • Author(s): Makishima, Takahashi, Yamada, Done, Kubota, et.al.
  • Journal Title: Publications of the Astronomical Society of Japan 60 Pages: 585-604
  • Peer Reviewed
• [Journal Article] The CALET mission on the ISS (2008)
  • Author(s): Torii, et.al.
  • Journal Title: SPIE 7021 Pages: 702114-702114-11
• [Journal Article] Discovery of aBright Transient Ultraluminous X-Ray Source, Suzaku J1305-4931 in NGC4945 (2008)
  • Author(s): Isobe, N.・Kubota, A.・Makishima, K., et. al.
  • Journal Title: Publ. Astron. Soc. Japan 60 Pages: S241-S250
  • Peer Reviewed
• [Journal Article] Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku (2008)
  • Author(s): Takahashi, H.・Fukazawa, Y.・Mizuno, T.・Hirasawa, A.・Kitamoto, S.・Sudoh, K.・Ogita, T.・Kubota, A.・Makishima, K., et. al.
  • Journal Title: Publ. Astron. Soc. Japan 60 Pages: S69-S84
  • Peer Reviewed
• [Journal Article] Modelling the behaviour of accretion flows in X-ray binaries. Everything you always wanted to know about accretion but were afraid to ask (2007)
  • Author(s): Done Chris, Gierlinski Marek, Kubota, Aya
  • Journal Title: The Astronomy and Astrophysics Review 15 Pages: 1-66
• [Journal Article] Modelling the behaviour of accretion flows in X-ray binaries. Everything you always wanted to know about accretion but were afraid to ask (2007)
  • Author(s): Done, C.・Gierlinski, M.・Kubota, A
  • Journal Title: The Astronomy and Astrophysics Review 15 Pages: 1-66
  • Peer Reviewed
• [Journal Article] Suzaku observation of the black hole transient 4U1630-472: discovery of absorption lines (2007)
  • Author(s): Kubota, A.・Dotani, T., et. al.
  • Journal Title: Proceedings of IAU Symposium #238, Cambridge, UK: Cambridge University Press, Pages: 23-28
• [Journal Article] Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku
  • Author(s): Takahashi, Hiromitsu; Fukazawa, Yasushi; Mizuno, Tsunefumi; Hirasawa, Ayumi; Kitamoto, Shunji; Sudoh, Keisuke; Ogita, Takayuki; Kubota, Aya; Makishima, Kazuo; Itoh, Takeshi; Parmar, Arvind N.; Ebisawa, Ken; Naik, Sachindra; Dotani, Tadayasu; Kokubun, Motohide; Ohnuki, Kousuke; Takahashi, Tadayuki; Yaqoob, Tahir; Angelini, Lorella; Ueda, Yoshihiro; Yamaoka, Kazutaka; Kotani, Taro; Kawai, Nobuyuki; Namiki, Masaaki; Kohmura, Takayoshi; Negoro, Hitoshi
  • Journal Title: Publications of the Astronomical Society of Japan Vol.60,No.SP1 Pages: S69-S84
  • Peer Reviewed
• [Presentation] 「すざく」によるLMC X-3の観測とブラックホール降着円盤モデルの検証 (2009)
  • Author(s): 久保田あや、吉田健二、Chris Done、堂谷忠靖、上田佳宏、水野恒史、大須賀健
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山口大学
  • Year and Date: 20090900
• [Presentation] 「すざく」によるLMC X-3の観測とブラックホール降着円盤モデルの検証 (2009)
  • Author(s): ○久保田あや、吉田健二、Chris Done、堂谷忠靖、上田佳宏、水野恒史、大須賀健
  • Organizer: 日本天文学会
  • Place of Presentation: 山口大学
  • Year and Date: 2009-09-11