Search for super-hot gas in clusters of galaxies

2012 Fiscal Year Final Research Report

• Project/Area Number: 22740124
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Nara Women's University
• Principal Investigator: OTA Naomi 奈良女子大学, 自然科学系, 助教 (40391891)
• Project Period (FY): 2010 – 2012
• Keywords: X線γ線天文学

Research Abstract

To reveal the evolution of galaxy clusters in the Universe, X-ray spectroscopic data taken with the Suzaku satellite were analyzed. The existence of super-hot gas produced by cluster merging was confirmed, while hard X-ray emission from high-energy particles was not detected. In addition, density profiles of the cluster gas were calculated assuming that the gas is in a quasi-hydrostatic cooling state and compared with previous X-ray observations.

Research Products

• [Journal Article] Density Profile of a Cool Core of Galaxy Clusters (2013)
  • Author(s): N. Ota, K. Onzuka, K. Masai
  • Journal Title: Publ. Astron. Soc. Japan Volume: 65 Pages: 11
  • URL: http://pasj.asj.or.jp/v65/n2/650047/650047.pdf
  • Peer Reviewed
• [Journal Article] Suzaku Observations of the Outskirts of A1835: Deviation from Hydrostatic Equilibrium (2013)
  • Author(s): K. Ichikawa, K. Matsushita, N. Okabe, K. Sato, Y.-Y. Zhang, A. Finoguenov, Y. Fujita, Y. Fukazawa, M. Kawaharada, K. Nakazawa, T. Ohashi, N. Ota, M. Takizawa, T. Tamura, & K. Umetsu
  • Journal Title: Astrophys. J. Volume: 766 Pages: 19
  • DOI: DOI:10.1088/0004-637X/766/2/90
  • Peer Reviewed
• [Journal Article] The Hidden Fortress: structure and substructure of the complex strong lensing cluster SDSS J1029+2623 (2013)
  • Author(s): M. Oguri, T. Schrabback, E. Jullo, N. Ota, C. S. Kochanek, X. Dai, E. O. Ofek, G. T. Richards, R. D. Blandford, E. E. Falco, & J. Fohlmeister
  • Journal Title: Mon. Not. R. Astron. Soc. Volume: 429 Pages: 482-493
  • DOI: DOI: 10.1093/mnras/sts351
  • Peer Reviewed
• [Journal Article] Suzaku Observations of the Hydra A cluster out to the Virial Radius (2012)
  • Author(s): T. Sato, T. Sasaki, K. Matsushita, E. Sakuma, K. Sato, Y. Fujita, N. Okabe, Y. Fukazawa, K. Ichikawa, M. Kawaharada, K. Nakazawa, T. Ohashi, N. Ota, M. Takizawa, & T. Tamura
  • Journal Title: Publ. Astron. Soc. Japan Volume: 64 Pages: 1
  • URL: http://pasj.asj.or.jp/v64/n5/640095/640095-frame.html
  • Peer Reviewed
• [Journal Article] The Chandra view of the Largest Quasar Lens SDSS J1029+2623 (2012)
  • Author(s): N. Ota, M. Oguri, X. Dai, C. S. Kochanek, G. T. Richards, E. O. Ofek, R. D. Blandford, T. Schrabback, & N. Inada
  • Journal Title: Astrophys. J. Volume: 758 Pages: 26-35
  • DOI: DOI:10.1088/0004-637X/758/1/26
  • Peer Reviewed
• [Journal Article] The ASTRO-H X-ray Observatory (2012)
  • Author(s): T. Takahashi
  • Journal Title: SPIE Volume: 8443 Pages: 22
  • DOI: DOI: 10.1117/12.926190
• [Journal Article] X-ray spectroscopy of clusters of galaxies (2012)
  • Author(s): N. Ota
  • Journal Title: Research in Astronomy and Astrophysics Volume: 12 Pages: 973-994
  • DOI: DOI:10.1088/1674-4527/12/8/006
  • Peer Reviewed
• [Journal Article] X-Ray Study of the Outer Region of Abell 2142 with Suzaku (2011)
  • Author(s): H. Akamatsu, A. Hoshino, Y. Ishisaki, T. Ohashi, K. Sato, Y. Takei, & N. Ota
  • Journal Title: Publ. Astron. Soc. Japan Volume: 63S Pages: 1019-1033
  • URL: http://pasj.asj.or.jp/v63/sp3/63s348/63s348-frame.html
  • Peer Reviewed
• [Journal Article] Suzaku Observations of Iron K-Lines from the Intracluster Medium of the Coma Cluster (2011)
  • Author(s): T. Sato, K. Matsushita, N. Ota, K. Sato, K. Nakazawa, & C. L. Sarazin
  • Journal Title: Publ. Astron. Soc. Japan Volume: 63S Pages: 991-1007
  • URL: http://pasj.asj.or.jp/v63/sp3/63s345/63s345-frame.html
  • Peer Reviewed
• [Journal Article] Suzaku Observations of Metal Distributions in the Intracluster Medium of the Centaurus Cluster (2011)
  • Author(s): E. Sakuma, N. Ota, K. Sato, T. Sato, & K. Matsushita
  • Journal Title: Publ. Astron. Soc. Japan Volume: 63S Pages: 979-990
  • URL: http://pasj.asj.or.jp/v63/sp3/63s344/63s344-frame.html
  • Peer Reviewed
• [Journal Article] Suzaku observations of X-ray excess emission in the cluster of galaxies A 3112 (2010)
  • Author(s): T. Lehto, J. Nevalainen, M. Bonamente, N. Ota, & J. Kaastra
  • Journal Title: Astron. Astrophys. Volume: 524 Pages: 8
  • DOI: DOI:10.1051/0004-6361/201014508
  • Peer Reviewed
• [Journal Article] Impact of Chandra calibration uncertainties on galaxy cluster temperatures: application to the Hubble Constant (2010)
  • Author(s): E. D. Reese, H. Kawahara, T. Kitayama, N. Ota, S. Sasaki, & Y. Suto
  • Journal Title: Astrophys. J. Volume: 721 Pages: 653-669
  • DOI: DOI:10.1088/0004-637X/721/1/653
  • Peer Reviewed
• [Journal Article] The ASTRO-H Mission (2010)
  • Author(s): T. Takahashi
  • Journal Title: SPIE Volume: 7732 Pages: 18
  • DOI: DOI: 10.1117/12.857875
• [Presentation] すざく衛星による近傍銀河団のガスバルク運動の探査 (2013)
  • Author(s): 吉田浩子, 太田直美
  • Organizer: 日本天文学会2013 年春季年会
  • Place of Presentation: 埼玉大学, 埼玉県
  • Year and Date: 2013-03-20
• [Presentation] すざく衛星による遠方の衝突銀河団A2744のフィラメント領域の観測 (2013)
  • Author(s): 茨木優希子, 太田直美, 赤松弘規, Y.-Y. Zhang, A. Finoguenov, F. Braglia
  • Organizer: 日本天文学会2013 年春季年会
  • Place of Presentation: 埼玉大学, 埼玉県
  • Year and Date: 2013-03-20
• [Presentation] XMM-Newton衛星を用いた低表面輝度銀河団A1631 のエントロピー測定 (2013)
  • Author(s): 藤野遥子, 太田直美, 山内茂雄, H. Boehringer, G. W. Pratt
  • Organizer: 日本天文学会2013年春季年会
  • Place of Presentation: 埼玉大学, 埼玉県
  • Year and Date: 2013-03-20
• [Presentation] すざく衛星による低表面輝度銀河団A76 のエントロピー測定 (2013)
  • Author(s): 藤野遥子, 太田直美, 山内茂雄, H. Boehringer
  • Organizer: 日本天文学会2012 年春季年会
  • Place of Presentation: 龍谷大学, 京都府
  • Year and Date: 2013-03-19
• [Presentation] Density Profile of Cool Core of Galaxy Clusters (2013)
  • Author(s): N. Ota
  • Organizer: The mass profiles of galaxy clusters from the core to the outskirts: the need for a multi-wavelength approach
  • Place of Presentation: Madonna di Campiglio, Italy
  • Year and Date: 2013-03-18
• [Presentation] The ASTRO-H Mission (2012)
  • Author(s): N. Ota
  • Organizer: Science with eROSITA and ART-XC aboard Spectrum-RG
  • Place of Presentation: Kazan, Russia
  • Year and Date: 2012-09-04
• [Presentation] Impact of Suzaku Measurements on Astroparticle Physics (2012)
  • Author(s): N. Ota
  • Organizer: Vulcano Workshop 2012: Frontier Objects in Astrophysics and Particle Physics
  • Place of Presentation: Vulcano, Italy
  • Year and Date: 2012-06-28
• [Presentation] すざく衛星を用いたThe Bullet Cluster の硬X線探査 (2012)
  • Author(s): 永吉賢一郎, 太田直美, 松下恭子, 満田和久
  • Organizer: 日本天文学会2012 年春季年会
  • Place of Presentation: 龍谷大学, 京都府
  • Year and Date: 2012-03-19
• [Presentation] Detection of hard X-ray emission from the hottest Abell galaxy cluster A2163 with Suzaku (2011)
  • Author(s): N. Ota, et al.
  • Organizer: The 4th Suzaku Science Conference - Exploring the X-ray Universe: Suzaku and Beyond
  • Place of Presentation: SLAC National Accelerator Laboratory, USA
  • Year and Date: 2011-07-20
• [Presentation] すざく衛星による高温銀河団A2163 からの硬X線放射の検出 (2010)
  • Author(s): 太田直美, G. W. Pratt, 北山哲, 大島泰,松尾宏, 坪井昌人, T. H. Reiprich
  • Organizer: 日本天文学会2010年秋季年会
  • Place of Presentation: 金沢大学, 石川県
  • Year and Date: 2010-09-24
• [Presentation] すざく衛星によるケンタウルス座銀河団の重元素分布の決定 (2010)
  • Author(s): 佐久間絵理, 松下恭子, 太田直美
  • Organizer: 日本天文学会2010年秋季年会
  • Place of Presentation: 金沢大学, 石川県
  • Year and Date: 2010-09-24
• [Remarks]
  • URL: http://www.phys.nara-wu.ac.jp/~ota/