X-ray study of state transitions of black hole binaries

• Project/Area Number: 24540237
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Shibaura Institute of Technology
• Principal Investigator: Kubota Aya 芝浦工業大学, システム理工学部, 准教授 (00391938)
• Research Collaborator: Done Chris
• Project Period (FY): 2012-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: X線 / ブラックホール / 降着流 / 状態遷移 / すざく衛星 / very high state / X線天文学 / Ｘ線天文学 / 降着円盤 / 質量放出 / Ｘ線天文 / ASTRO-H衛星 / 国際情報交流 / 質量降着

Outline of Final Research Achievements

The two best known black hole binary states are the low/hard and high/soft states. The low/hard state is dominated by hard Comptonised emission from a hot, optically thin flow whereas the high/soft state is instead dominated by soft, blackbody emission from a cool, optically thick disk. To understand what makes the transition is the key issue to understand important parameters which determine the emission efficiency. Especially the very high state (VHS) is the key to understand the transition since it is the intermediate state between the high state and the low state. We developed a physical model for the accretion flow structure in the VHS, in which both thermal and non-thermal electrons are taken into account. Then we fit good VHS data observed with Suzaku, and found that the disk is truncated in the VHS and the corona can be understand with fully non-thermal electrons.

Research Products

• [Journal Article] Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster (2016)
  • Author(s): Aharonian, F. A., Akamatsu, H, Terada, Y. et al (Hitomi collaboration)
  • Journal Title: The Astrophysical Journal Letters Volume: 837 Issue: 1 Pages: 15-23
  • DOI: 10.3847/2041-8213/aa61fa
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] The ASTRO-H (Hitomi) x-ray astronomy satellite (2016)
  • Author(s): Takahashi, T. et al.
  • Journal Title: Proceedings of the SPIE Volume: 9905 Pages: 990510-11
  • DOI: 10.1117/12.2232379
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The quiescent intracluster medium in the core of the Perseus cluster (2016)
  • Author(s): Hitomi Collaboration et al.
  • Journal Title: Nature Volume: 535 Issue: 7610 Pages: 117-121
  • DOI: 10.1038/nature18627
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Tracking the energetics of the non-thermal disc-corona-jet in the very high state GX 339 - 4 (2016)
  • Author(s): Aya Kubota, Chris Done
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 458 Issue: 4 Pages: 4238-4249
  • DOI: 10.1093/mnras/stw585
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Broadband X-ray study of the galactic black hole binary 4U 1630-47 with Suzaku (2016)
  • Author(s): Hori, T.; Ueda, Y.; Done, C.; Shidatsu, M.; Kawamuro, T.; Kubota, A.; Nakahira, S.
  • Journal Title: Astronomische Nachrichten Volume: 337 Issue: 4-5 Pages: 467-467
  • DOI: 10.1002/asna.201612331
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Suzaku Observation of X-ray Variability in Soft State LMC X-1 (2015)
  • Author(s): Koyama ; S. Yamada; A. Kubota; M. S. Tashiro; Y. Terada; K. Makishima
  • Journal Title: Publications of Astronomical Society Japan Volume: - Issue: 3 Pages: 46-55
  • DOI: 10.1093/pasj/psv017
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The ASTRO-H X-ray astronomy satellite (2014)
  • Author(s): T. Takahashi, S. Konami (他共著者246人)
  • Journal Title: Proceedings of the SPIE Volume: 9144 Pages: 25-48
  • DOI: 10.1117/12.2055681
  • Peer Reviewed / Open Access
• [Journal Article] SUZAKU Observation of the Black Hole Binary 4U 1630-47 in the Very High State (2014)
  • Author(s): Takafumi Hori, Yoshihiro Ueda, Megumi Shidatsu, Taiki Kawamuro, Aya Kubota, Chris Done, Satoshi Nakahira, Kohji Tsumura, Mai Shirahata, and Takahiro Nagayama
  • Journal Title: The Astrophysical Journal Volume: Volume 790 Issue: 1 Pages: 20-30
  • DOI: 10.1088/0004-637x/790/1/20
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Spectral and Timing Properties of the Black Hole X-Ray Binary H1743-322 in the Low/Hard State Studied with Suzaku (2014)
  • Author(s): M. Shidatsu, Y. Ueda, S. Yamada, C. Done, T. Hori, K. Yamaoka, A. Kubota, T. Nagayama, and Y. Moritani
  • Journal Title: The Astrophysical Journal Volume: Volume 789 Issue: 2 Pages: 100-111
  • DOI: 10.1088/0004-637x/789/2/100
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Two Power-Law States of the Ultraluminous X-Ray Source IC 342 X-1 (2013)
  • Author(s): Yoshida Tessei, Isobe Naoki, Mineshige Shin, Kubota Aya, Mizuno Tsunefumi. Saitou Kei
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Vol. 65 No.2 Issue: 2
  • DOI: 10.1093/pasj/65.2.48
  • Peer Reviewed
• [Journal Article] Highly Ionized Fe-K Absorption Line from Cygnus X-1 in the High/Soft State Observed with Suzaku (2013)
  • Author(s): Yamada, S., Torii, S., Mineshige, S., Ueda, Y., Kubota, A., Gandhi, P., Done, C., Noda, H., Yoshikawa, A. & Makishima, K
  • Journal Title: Astrophys. J. Lett. 767 Volume: id. L35 Issue: 2 Pages: 6-6
  • DOI: 10.1088/2041-8205/767/2/l35
  • Peer Reviewed
• [Journal Article] Suzaku Investigation into the Nature of the Nearest Ultraluminous X-Ray Source, M33 X-8 (2012)
  • Author(s): Isobe N., Kubota A., Sato H., Mizuno T.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: Vol.64, No.6 Pages: 119-128
  • NAID: 10031146593
  • Peer Reviewed
• [Journal Article] The ASTRO-H X-ray Observatory (2012)
  • Author(s): T. Takahashi, et al.
  • Journal Title: Proceedings of the SPIE Volume: 8443 Pages: 1-22
  • DOI: 10.1117/12.926190
• [Journal Article] The Truncated Disk from Suzaku Data of GX 339-4 in the Extreme Very High State (2012)
  • Author(s): Tamura M., Kubota A., Yamada S., Done C., Kolehmainen M., Ueda Y., Torii S.
  • Journal Title: The Astrophysical Journal Volume: Volume 753, Issue 1 Issue: 1 Pages: 65-75
  • DOI: 10.1088/0004-637x/753/1/65
  • Peer Reviewed
• [Journal Article] A Candidate Active Galactic Nucleus with a Pure Soft Thermal X-Ray Spectrum (2012)
  • Author(s): Terashima, Y., Kamizasa, N., Awaki, H., Kubota, A., Ueda, Y.
  • Journal Title: Astrophys. J. Volume: 752 Issue: 2 Pages: 154-154
  • DOI: 10.1088/0004-637x/752/2/154
  • Peer Reviewed
• [Presentation] Disk-corona model for highly accreting black holes and its application to ULXs (2016)
  • Author(s): Aya Kubota
  • Organizer: ULXs and their environments
  • Place of Presentation: France, Strasbourg
  • Year and Date: 2016-06-13
  • Int'l Joint Research
• [Presentation] GX 339-4のVery high stateにおける円盤コロナおよび内縁流の幾何学的配置の観測的決定 (2015)
  • Author(s): 久保田あや、Chris Done
  • Organizer: 日本天文学会2015年秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] 非熱的電子の考慮した円盤コロナ放射モデルの構築とブラックホール天体GX339-4のvery high state のすざく観測データへの適用 (2015)
  • Author(s): 久保田あや、Chris Done
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 大阪大学
  • Year and Date: 2015-03-21