Study of energy budget in the evolution of galaxy clusters

• Project/Area Number: 25400231
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Nara Women's University
• Principal Investigator: Ota Naomi 奈良女子大学, 自然科学系, 准教授 (40391891)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: Ｘ線天文学 / 宇宙物理学 / 銀河団 / 高温プラズマ / 衝突合体現象 / 非熱的放射 / 乱流 / 宇宙構造形成 / X線天文学

Outline of Final Research Achievements

Clusters of galaxies grow into the present shape via collisions and mergers of smaller objects. If clusters collide with each other, a huge amount of kinetic energy may be released and a certain fraction is expected to heat the gas and generate high-energy particles, and induce bulk and turbulent motions. To reveal the energy budget in the cluster evolution, we constrained the existence of very hot/non-thermal gas in clusters using the Suzaku satellite. From a systematic search for gas motions, we discovered the sign of large bulk motions in both regular and irregular clusters and a significant offset between the spatial distributions of gas and galaxies. Furthermore, we carried out simulations of spectral observations using high-resolution X-ray calorimeter onboard the ASTRO-H satellite and showed a possibility that we can measure the turbulent gas motion and the cluster mass with high accuracy.

Research Products

• [Int'l Joint Research] Argelander-Institut fuer Astronomie(ドイツ)
• [Int'l Joint Research] Yale University(米国)
• [Journal Article] Central Mass Profiles of the Nearby Cool-core Galaxy Clusters Hydra A and A478 (2016)
  • Author(s): N. Okabe, K. Umetsu, T. Tamura, Y. Fujita, M. Takizawa, K. Matsushita, Y. Fukazawa, T. Futamase, M. Kawaharada, S. Miyazaki, Y. Mochizuki, K. Nakazawa, T. Ohashi, N. Ota, T. Sasaki, K. Sato, & S. I. Tam
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 456 Issue: 4 Pages: 4475-4487
  • DOI: 10.1093/mnras/stv2916
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for gas bulk motions in eight nearby clusters of galaxies with Suzaku (2016)
  • Author(s): Naomi Ota, Hiroko Yoshida
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 00 Issue: SP1 Pages: 1-14
  • DOI: 10.1093/pasj/psv128
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Future Japanese X-ray TES Calorimeter Satellite: DIOS (Diffuse Intergalactic Oxygen Surveyor) (2016)
  • Author(s): S.Yamada et al.
  • Journal Title: Journal of Low Temperature Physics Volume: 1 Issue: 3-4 Pages: 1-6
  • DOI: 10.1007/s10909-015-1362-2
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Universal profiles of the intracluster medium from Suzaku X-ray and Subaru weak-lensing observations (2014)
  • Author(s): N. Okabe, K. Uetsu, T. Tamura, Y. Fujita, M. Takizawa, Y.-Y. Zhang, K. Matsushita, T. Hamana, Y. Fukazawa, Yasushi, T. Futamase, M. Kawaharada, S. Miyazaki, Y. Mochizuki, K. Nakazawa, T. Ohashi, N. Ota, T. Sasaki, K. Sato, S. Tam
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 5 Pages: 99-99
  • DOI: 10.1093/pasj/psu075
  • Peer Reviewed / Open Access
• [Journal Article] Soft x-ray spectrometer (SXS): the high-resolution cryogenic spectrometer onboard ASTRO-H (2014)
  • Author(s): K. Mitsuda, S. Konami (他共著者51人)
  • Journal Title: Proceedings of the SPIE Volume: 9144 Pages: 91442A-91442A
  • DOI: 10.1117/12.2057199
  • Peer Reviewed
• [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] Investigating the Hard X-ray Emission from the Hottest Abell Cluster A2163 with Suzaku (2014)
  • Author(s): N. Ota, K. Nagayoshi, G. W. Pratt, T. Kitayama, T. Oshima, & T. H. Reiprich
  • Journal Title: Astronomy & Astrophysics Volume: 562 Pages: A60-A60
  • DOI: 10.1051/0004-6361/201322878
  • Peer Reviewed
• [Journal Article] Gas Bulk Motion in the Perseus Cluster Measured with Suzaku (2014)
  • Author(s): Tamura, T.; Yamasaki, N.Y.; Iizuka, R.; Fukazawa, Y.; Hayashida, K.; Ueda, S.; Matsushita, K.; Sato, K.; Nakazawa, K.; Ota, N.; Takizawa, M
  • Journal Title: Astrophysical Journal Volume: 782-1 Issue: 1 Pages: 38-52
  • DOI: 10.1088/0004-637x/782/1/38
  • Peer Reviewed
• [Journal Article] Suzaku Study of Gas Properties along Filaments of A2744 (2014)
  • Author(s): Y. Ibaraki, N. Ota, H. Akamatsu, Y.-Y. Zhang, & A. Finoguenov
  • Journal Title: Astronomy & Astrophysics Volume: 782 Pages: A11-A11
  • DOI: 10.1051/0004-6361/201322806
  • Peer Reviewed
• [Journal Article] Suzaku observations of the low surface brightness cluster A76 (2014)
  • Author(s): N. Ota, Y. Fujino, Y. Ibaraki, H. Böhringer, & G. Chon
  • Journal Title: Astronomy & Astrophysics Volume: 556 Pages: A21-A21
  • DOI: 10.1051/0004-6361/201321676
  • Peer Reviewed
• [Journal Article] Density Profile of a Cool Core of Galaxy Clusters (2014)
  • Author(s): N. Ota, K. Onzuka, & K. Masai
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65 Issue: 2
  • DOI: 10.1093/pasj/65.2.47
  • Peer Reviewed
• [Journal Article] Suzaku Observations of the Outskirts of A1835 : Deviation from Hydrostatic Equilibrium (2013)
  • Author(s): K. Ichikara, et al.
  • Journal Title: ApJ Volume: 766 Issue: 2 Pages: 90-90
  • DOI: 10.1088/0004-637x/766/2/90
  • Peer Reviewed
• [Presentation] すざく衛星による Abell 2744 銀河団周辺のミッシングバリオン探査 (2016)
  • Author(s): 服部詩穂, 太田直美, 赤松弘規, Y.-Y. Zhang, A. Finoguenov
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-14
• [Presentation] すざく衛星による RXC J1053.7+5453 の電波レリック周辺領域の解析 (2016)
  • Author(s): 板花まどか, 滝沢元和, 赤松弘規, R. van Weeren, 河原創, 深沢泰司, J. Kaastra, 河原田円, 中澤知洋, 大橋隆哉, 太田直美, H. Roettgering, J. Vink, F. Zandanel
  • Organizer: 日本天文学会2016年春季年会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-14
• [Presentation] ASTRO-Hの目指すサイエンス (2016)
  • Author(s): 大橋隆哉, 山田真也, Richard Mushotzky, 松下恭子, 上田佳宏, 久保田あや, 太田直美, 内山泰伸, Randall Smith, 馬場彩, 湯浅孝行,井上芳幸, 辻本匡弘, 川原田円, 小高裕和, 中島真也, 高橋忠幸
  • Organizer: 第16回宇宙科学シンポジウム
  • Place of Presentation: 宇宙科学研究所
  • Year and Date: 2016-01-06
• [Presentation] 「すざく」衛星によるAbell2163銀河団による銀河団外縁部までの観測 (2015)
  • Author(s): 伊東雅史、松下恭子、佐藤浩介、太田直美
  • 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] Evolution of Groups and Clusters of Galaxies (2015)
  • Author(s): E. Pointecouteau, S. Allen, N. Ota
  • Organizer: Exploring the Hot and Energetic Universe: The first Scientific Conference dedicated to the Athena X-ray Observatory
  • Place of Presentation: ESA/ESAC, Spain
  • Year and Date: 2015-09-08
  • Int'l Joint Research
• [Presentation] New Frontiers in Galaxy Clusters with ASTRO-H (2015)
  • Author(s): Eric D. Miller, Tetsu Kitayama, Marshall Bautz, Maxim Markevitch, Kyoko Matsushita, Steven Allen, Madoka Kawaharada, Brian McNamara, Naomi Ota, et al.
  • Organizer: IAU General Assembly, Meeting #29
  • Place of Presentation: Hawaii, USA
  • Year and Date: 2015-08-03
  • Int'l Joint Research
• [Presentation] Prospects of Cluster Observations with ASTRO-H (2015)
  • Author(s): N. Ota
  • Organizer: Astroparticle View of Galaxy Clusters
  • Place of Presentation: 広島大学
  • Year and Date: 2015-03-24 – 2015-03-26
  • Invited
• [Presentation] すざく衛星による衝突銀河団A2255, A2744の温度構造の研究 (2015)
  • Author(s): 太田 直美, 水野 真梨子, 服部 詩穂, 赤松 弘規
  • Organizer: 第15回宇宙科学シンポジウム
  • Place of Presentation: 宇宙航空研究開発機構宇宙科学研究所
  • Year and Date: 2015-01-06 – 2015-01-07
• [Presentation] 「すざく」衛星による電波レリック領域のX線観測: 銀河団における粒子加速機構の理解に向けて (2015)
  • Author(s): 赤松 弘規, van Weeren Reinout, Kawahara Hajime, Fukazawa Yasushi, Kaastra Jelle, 川原田 円, 中澤 知洋, 大橋 隆哉, 太田 直美, Roettgering Huub, 滝沢 元和, Vink Jacco, Zandanel Fabio
  • Organizer: 第15回宇宙科学シンポジウム
  • Place of Presentation: 宇宙航空研究開発機構宇宙科学研究所
  • Year and Date: 2015-01-06 – 2015-01-07
• [Presentation] 「すざく」で探す銀河団外縁部のサブハロー/ガス塊 (2015)
  • Author(s): 佐々木 亨, 栗山 翼, 松下 恭子, 佐藤 浩介, 岡部 信広, 赤松 弘規, 大橋 隆哉, 藤田 裕, 川原田 円, 田村 隆幸, 中澤 知洋, 太田 直美, 滝沢 元和
  • Organizer: 第15回宇宙科学シンポジウム
  • Place of Presentation: 宇宙航空研究開発機構宇宙科学研究所
  • Year and Date: 2015-01-06 – 2015-01-07
• [Presentation] ASTRO-Hの目指すサイエンス (2015)
  • Author(s): 大橋 隆哉, Richard Mushotzky, 松下 恭子, 上田 佳宏, 久保田 あや, 太田 直美, 内山 泰伸, Randall Smith, 馬場 彩, 山田 真也, 湯浅 孝行, 辻本 匡弘, 川原田 円, 小高 裕和, 中島 真也, 高橋 忠幸
  • Organizer: 第15回宇宙科学シンポジウム
  • Place of Presentation: 宇宙航空研究開発機構宇宙科学研究所
  • Year and Date: 2015-01-06 – 2015-01-07
• [Presentation] すざく衛星による低表面輝度銀河団 A1631 のエントロピー分布の研究 (2014)
  • Author(s): 新郷 沙耶, 太田 直美, H. Boehringer, G. Chon, G. W. Pratt
  • Organizer: 日本天文学会2014年秋季年会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] 銀河団外縁部のエントロピー異常の原因の検証 (2014)
  • Author(s): 栗山 翼, 佐藤 浩介, 松下 恭子, 赤松 弘規, 大橋 隆哉, 藤田 裕, 川原田 円, 田村 隆幸, 中澤 知洋, 岡部 信広, 太田 直美, 滝沢 元和
  • Organizer: 日本天文学会2014年秋季年会
  • Place of Presentation: 山形大学
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] Search for very hot/non-thermal emission and gas motions in clusters (2014)
  • Author(s): N. Ota
  • Organizer: Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe
  • Place of Presentation: 愛媛大学
  • Invited
• [Presentation] Exploring gas properties along filaments of the Pandora’s cluster with Suzaku (2014)
  • Author(s): Y. Ibaraki, N. Ota, H. Akamatsu, Y.-Y. Zhang, & A. Finoguenov
  • Organizer: Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe
  • Place of Presentation: 愛媛大学
• [Presentation] Search for gas bulk motions in eight nearby clusters with Suzaku (2014)
  • Author(s): H. Yoshida & N. Ota
  • Organizer: Suzaku-MAXI 2014: Expanding the Frontiers of the X-ray Universe
  • Place of Presentation: 愛媛大学
• [Presentation] すざく衛星による低表面輝度銀河団A1631のエントロピー測定 (2014)
  • Author(s): 新郷 沙耶, 茨木 優希子, 太田 直美, H.Boehringer, G.Chon, G.W.Pratt
  • Organizer: 第14回宇宙科学シンポジウム
  • Place of Presentation: 宇宙科学研究所
• [Presentation] ASTRO-Hの目指すサイエンス (2014)
  • Author(s): 大橋隆哉 R. Mushotzky, 松下恭子, 上田佳宏, 久保田あや, 太田直美, 内山泰伸, R. Smith, 馬場 彩, 山田真也, 辻本匡弘, 川原田 円, 湯浅孝行, 小高裕和, 高橋忠幸, ASTRO-Hチーム
  • Organizer: 第14回宇宙科学シンポジウム
  • Place of Presentation: 宇宙科学研究所