Investigation of High Energy Phenomena in Merging Galaxy Clusters with Numerical Simulations and X-ray Observations

• Project/Area Number: 19740096
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Yamagata University
• Principal Investigator: TAKIZAWA Motokazu Yamagata University, 理学部, 准教授 (70323160)
• Project Period (FY): 2007 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥3,630,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥630,000); Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2007: ¥900,000 (Direct Cost: ¥900,000)
• Keywords: 理論天文学 / 銀河団 / 数値シミュレーション / X線天文学 / X線観測

Research Abstract

We studied high energy phenomena associated with cluster mergers through numerical simulations and X-ray observations. With N-body+(magneto) hydrodynamical simulations, we revealed characteristic magnetic field structures and uncertainty of mass estimation in merging clusters. We obtained upper-limits of nonthermal hard X-ray flux with Suzaku, and constrained lower limits of magnetic field strength. Joint analyses of Suzaku and weak lensing data revealed dynamical status of the systems.

Research Products

• [Journal Article] Suzaku X-ray Follow-up Observation of Weak-lensing-detected Halos in the Field around ZwCl0823.2+0425 (2011)
  • Author(s): Eri Watanabe, Motokazu Takizawa, Kazuhiro Nakazawa, Nobuhiro Okabe, Madoka Kawaharada, Arif Babul, Alexis Finoguenov, Graham P.Smith, James E.Taylor
  • Journal Title: Publications of the Astronomical Society of Japan 63 Pages: 357-366
  • NAID: 10029037058
  • Peer Reviewed
• [Journal Article] Suzaku X-ray Follow-up Observation of Weak-lensing-detected Halos in the Field around ZwCl0823.2+0425 (2011)
  • Author(s): Watanabe, E., et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 63 Pages: 357-366
  • Peer Reviewed
• [Journal Article] Mass Estimation of Merging Galaxy Clusters (2010)
  • Author(s): Motokazu Takizawa, Ryo Nagino, Kyoko Matsushita
  • Journal Title: Publications of the Astronomical Society of Japan 62 Pages: 951-963
  • NAID: 10026717204
  • Peer Reviewed
• [Journal Article] Suzaku Observation of Abell 1689 : Anisotropic Temperature and Entropy Distributions Associated with the Large-Scale Structure (2010)
  • Author(s): Madoka Kawaharada, Nobuhiro Okabe, Keiichi Umetsu, Motokazu Takizawa, Kyoko Matsushita, Yasushi Fukazawa, Takashi Hamana, Satoshi Miyazaki, Kazuhiro Nakazawa, Takaya Ohashi
  • Journal Title: The Astrophysical Journal 714 Pages: 423-441
  • Peer Reviewed
• [Journal Article] Mass Estimation of Merging Galaxy Clusters (2010)
  • Author(s): Takizawa, M., Nagino, R., Matsushita, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 62 Pages: 951-963
  • NAID: 10026717204
  • Peer Reviewed
• [Journal Article] Suzaku Observation of Abell 1689 : Anisotropic Temperature and Entropy Distributions Associated with the Large-Scale Structure (2010)
  • Author(s): Kawaharada, M., et al.
  • Journal Title: The Astrophysical Journal Volume: 714 Pages: 423-441
  • Peer Reviewed
• [Journal Article] Suzaku Observation of Abell 1689: Anisotropic Temperature and Entropy Distributions Associated with the Large-Scale Structure (2010)
  • Author(s): Madoka Kawaharada, Nobuhiro Okabe, Keiichi Umetsu, Motokazu Takizawa, Kyoko Matsushita, Yasushi Fukazawa, Takashi Hamana, Satoshi Miyazaki, Kazuhiro Nakazawa, Takaya Ohashi
  • Journal Title: The Astrophysical Journal 713(に掲載決定(印刷中))
  • Peer Reviewed
• [Journal Article] Suzaku Observation of the Radio Halo Cluster Abell 2319 : Gas Dynamics and Hard X-ray Properties (2009)
  • Author(s): Chika Sugawara, Motokazu Takizawa, Kazuhiro Nakazawa
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 1293-1303
  • NAID: 10026421782
  • Peer Reviewed
• [Journal Article] Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku (2009)
  • Author(s): Kazuhiro Nakazawa, Craig L.Sarazin, Madoka Kawaharada, Takao Kitaguchi, Sho Okuyama, Kazuo Makishima, Naomi Kawano, Yasushi Fukazawa, Susumu Inoue, Motokazu Takizawa, Daniel R.Wik, Alexis Finoguenov, Tracy E.Clarke
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 339-355
  • NAID: 10025598676
  • Peer Reviewed
• [Journal Article] Suzaku Observation of the Radio Halo Cluster Abell 2319: Gas Dynamics and Hard X-ray Properties (2009)
  • Author(s): Chika Sugawara, Motokazu Takizawa, Kazuhiro Nakazawa
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 1293-1303
  • NAID: 10026421782
  • Peer Reviewed
• [Journal Article] Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku (2009)
  • Author(s): Kazuhiro Nakazawa, Craig L. Sarazin, Madoka Kawaharada, Takao Kitaguchi, Sho Okuyama, Kazuo Makishima, Naomi Kawano, Yasushi Fukazawa, Susumu Inoue, Motokazu Takizawa, Daniel R. Wik, Alexis Finoguenov, Tracy E. Clarke
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 339-355
  • NAID: 10025598676
  • Peer Reviewed
• [Journal Article] Suzaku Observation of the Radio Halo Cluster Abell 2319 : Gas Dynamics and Hard X-ray Properties (2009)
  • Author(s): Sugawara, C., Takizawa, M., Nakazawa, K.
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 1293-1303
  • NAID: 10026421782
  • Peer Reviewed
• [Journal Article] Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku (2009)
  • Author(s): Nakazawa, K., et al.
  • Journal Title: Publications of the Astronomical Society of Japan 61 Pages: 339-355
  • Peer Reviewed
• [Journal Article] N-body + Magnetohydrodynamical Simulations of Merging Clusters of Galaxies : Characteristic Magnetic Field Structures Generated by Bulk Flow Motion (2008)
  • Author(s): Motokazu Takizawa
  • Journal Title: The Astrophysical Journal 687 Pages: 951-958
  • Peer Reviewed
• [Journal Article] Suzaku Observation of the Ophiuchus Galaxy Cluster : One of the Hottest Cool Core Clusters (2008)
  • Author(s): Yutaka Fujita, Kiyoshi Hayashida, Masaaki Nagai, Susumu Inoue, Hironori Matsumoto, Nobuhiro Okabe, Thomas. H.Reiprich, Craig L.Sarazin, Motokazu Takizawa
  • Journal Title: Publications of the Astonomical Society of Japan 60 Pages: 1133-1142
  • NAID: 10023955091
  • Peer Reviewed
• [Journal Article] High Metallicity of the X-Ray Gas up to the Virial Radius of a Binary Cluster of Galaxies : Evidence of Galactic Superwinds at High-Redshift (2008)
  • Author(s): Yutaka Fujita, Noriaki Tawa, Kiyoshi Hayashida, Motokazu Takizawa, Hironori Matsumoto, Nobuhiro Okabe, Thomas H.Reiprich
  • Journal Title: Publications of the Astonomical Society of Japan 60
  • NAID: 10023956882
  • Peer Reviewed
• [Journal Article] N-body + Magnetohydrodynamical Simulations of Merging Clusters of Galaxies: Characteristic Magnetic Field Structures Generated by Bulk Flow Motion (2008)
  • Author(s): Motokazu Takizawa
  • Journal Title: The Astrophysical Journal 687 Pages: 951-958
  • Peer Reviewed
• [Journal Article] Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters (2008)
  • Author(s): Yutaka Fujita, Kiyoshi Hayashida, Masaaki Nagai, Susumu Inoue, Hironori Matsumoto, Nobuhiro Okabe, Thomas. H. Reiprich, Craig L. Sarazin, Motokazu Takizawa
  • Journal Title: Publications of the Astonomical Society of Japan 60 Pages: 1133-1142
  • NAID: 10023955091
  • Peer Reviewed
• [Journal Article] N-body+Magnetohydrodynamical Simulations of Merging Clusters of Galaxies : Characteristic Magnetic Field Structures Generated by Bulk Flow Motion (2008)
  • Author(s): Motokazu Takizawa
  • Journal Title: The Astrophysical Journal 687 Pages: 951-958
  • Peer Reviewed
• [Journal Article] Suzaku Observation of the Ophiuchus Galaxy Cluster : One of the Hottest Cool Core Clusters (2008)
  • Author(s): Fujita, Y. et.al.
  • Journal Title: Publications of the Astronomical Society of Japan 60 Pages: 1133-1142
  • Peer Reviewed
• [Journal Article] High Metallicity of the X-Ray Gas up to the Virial Radius of a Binary Cluster of Galaxies: Evidence of Galactic Superwinds at High-Redshift (2008)
  • Author(s): Fujita, Y., et. al.
  • Journal Title: Publications of the Astonomical Society of Japan 60
  • Peer Reviewed
• [Presentation] Mass Estimation of Merging Galaxy Clusters (2011)
  • Author(s): 滝沢元和、薙野綾、松下恭子
  • Organizer: 国立天文台天文シミュレーションプロジェクトユーザーズミーティング
  • Place of Presentation: 国立天文台三鷹
• [Presentation] Mass Estimation of Merging Galaxy Clusters (2010)
  • Author(s): Takizawa, M., Nagino, R., Matsushita, K.
  • Organizer: The Fourth East Asian Numerical Astrophysics Meeting
  • Place of Presentation: ASIAA, Taipei, Taiwan
  • Year and Date: 2010-11-02
• [Presentation] Mass Estimation of Merging Galaxy Clusters (2010)
  • Author(s): 滝沢元和
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 金沢大学
  • Year and Date: 2010-09-24
• [Presentation] X線と弱重力レンズによるZwCl0823.2+0425銀河団周辺の大規模構造フィラメントの解析 (2010)
  • Author(s): 渡邉瑛里, 他
  • Organizer: 日本天文学会2010年春季年会
  • Place of Presentation: 広島大学
  • Year and Date: 2010-03-25
• [Presentation] Mass Estimation of Merging Galaxy Clusters (2010)
  • Author(s): Takizawa, M., Nagino, R., Matsushita, K.
  • Organizer: CL J2010 : from Massive Galaxy Formation to Dark Energy
  • Place of Presentation: IPMU, Kashiwa, Japan
• [Presentation] 衝突銀河団の質量評価 (2010)
  • Author(s): 滝沢元和、薙野綾、松下恭子
  • Organizer: 理論懇シンポジウム「林忠四郎先生と天文学・宇宙物理学」
  • Place of Presentation: 京都大学
• [Presentation] Magnetic Field Structures in Merging Clusters of Galaxies (2010)
  • Author(s): 滝沢元和
  • Organizer: 国立天文台天文シミュレーションプロジェクトユーザーズミーティング
  • Place of Presentation: 国立天文台三鷹
• [Presentation] Magnetic Field Structures in Merging Clusters of Galaxies (2009)
  • Author(s): Motokazu Takizawa
  • Organizer: Shock Waves, Turbulence, and Particle Acceleration
  • Place of Presentation: Pohang, Korea
  • Year and Date: 2009-11-21
• [Presentation] Magnetic Field Structures in Merging Clusters of Galaxies (2009)
  • Author(s): Motokazu Takizawa
  • Organizer: Shock Waves Turbulence, and Particle Acceleration
  • Place of Presentation: Pohang, Korea
  • Year and Date: 2009-11-21
• [Presentation] すざく衛星を用いた銀河団の広帯域・多波長観測 (2009)
  • Author(s): 滝沢元和, 他
  • Organizer: 首都大宇宙理論研究室談話会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2009-11-11
• [Presentation] X線と弱重力レンズによるZwCl0823.3+0425銀河団周辺の大規模構造フィラメントの解析 (2009)
  • Author(s): 渡邉瑛里
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 山口大
  • Year and Date: 2009-09-14
• [Presentation] すざく衛星によるAbell 2319銀河団の広帯域スペクトル解析 (2009)
  • Author(s): 菅原知佳
  • Organizer: 日本天文学会2009年春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] 銀河団衝突にともなう高温ガスの運動がひきおこす特徴的な磁場構造 (2009)
  • Author(s): 滝沢元和
  • Organizer: 日本天文学会2009年春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] すざく衛星によるAbel12319銀河団の広帯域スペクトル解析 (2009)
  • Author(s): 菅原知佳、滝沢元和、中澤知洋、奥山翔
  • Organizer: 日本天文学会2009年春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] X線と弱重力レンズによるZwCl0823. 3+4250銀河団周辺の大規模構造フィラメントの解析 (2009)
  • Author(s): 渡邉瑛里、中澤知洋、浜名崇、宮崎聡、岡部信広、滝沢元和、川原田円
  • Organizer: 日本天文学会2009年春季年会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2009-03-26
• [Presentation] Suzaku Observation of the Radio Halo Cluster Abell 2319: Hard X-ray Prope rties and Gas Dynamics (2009)
  • Author(s): Takizawa, M., Sugawara, C., Nakazawa K.
  • Organizer: The Energetic Cosmos: from Suzaku to Astro-H
  • Place of Presentation: Otaru, Japan
• [Presentation] Suzaku Observation of the Radio Halo Cluster Abell 2319 Hard X-ray Properties and Gas Dynamics (2009)
  • Author(s): Takizawa, M., Sugawara, C., Nakazawa K.
  • Organizer: The Energetic Cosmos from Suzaku to Astro-H
  • Place of Presentation: Otaru, Japan
• [Presentation] Suzaku Observation of Large Scale Structure Filaments around ZwC10823.2+0425 Found through the Local Cluster Substructure Survey (2009)
  • Author(s): 渡邉瑛里, et al.
  • Organizer: The Energetic Cosmos : from Suzaku to Astro-H
  • Place of Presentation: Otaru, Japan
• [Presentation] すざく衛星によるAbell2319銀河団ガスの温度構造とバルク運動の測定 (2008)
  • Author(s): 菅原知佳、滝沢元和、中澤知洋、奥山翔
  • Organizer: 日本天文学会2008年秋期年会
  • Place of Presentation: 岡山理科大
  • Year and Date: 2008-09-11
• [Presentation] N体+流体シミュレーションで探る衝突銀河団の質量決定の不定性 (2008)
  • Author(s): 滝沢元和、薙野綾、松下恭子
  • Organizer: 先駆的科学計算に関するフォーラム2008〜天文科学〜
  • Place of Presentation: 九州大学
  • Year and Date: 2008-07-21
• [Presentation] Mass Estimation of Merging Clusters of Galaxies (2008)
  • Author(s): Motokazu Takizawa, Ryo Nagino, Kyoko Matsushita
  • Organizer: The 10th Asian-Pacific Rigional Meeting o of the International Astronomical Union
  • Place of Presentation: Kunming China
• [Presentation] Mass Estimation of Merging Clusters of Galaxies (2008)
  • Author(s): Motokazu Takizawa, Ryo Nagino, Kvoko Matsushita
  • Organizer: The 10th Asian-Pacific Regional Meeting of The International Astronomical Union
  • Place of Presentation: Kunming, China
• [Presentation] N-body+Magnetohydrodynamical Simulations of Merging Clusters of Galaxies : Characteristic Magnetic Field Structures Generat ed by Bulk Flow Motion (2008)
  • Author(s): 滝沢元和
  • Organizer: 理論懇シンポジウム「理論天文学の将来」
  • Place of Presentation: 国立天文台
• [Presentation] 「すざく」衛星によるAbell 2399銀河団の観測 (2008)
  • Author(s): 菅原知佳・滝沢元和・中澤知洋・奥山翔
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
• [Presentation] Sunyaev-Zel'dovich効果を用いた銀河団ガスの運動状態決定について (2008)
  • Author(s): 田中誠・中村雄史・滝史元和
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
• [Presentation] 銀河団の質量決定について (2008)
  • Author(s): 滝沢元和・薙野綾・松下恭子
  • Organizer: 日本天文学会2008年春季年会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
• [Presentation] Numerical Simulations of Merging Galaxy Cluster:Ram Pressure-stripping in the Substructures and Magnetic Field Evolution (2007)
  • Author(s): Motokazu, Takizawa
  • Organizer: Tracing Cosmic Evolution with Clusters of Galaxies:Six Year Later
  • Place of Presentation: Sesto,Italy
• [Presentation] 衝突銀河団に関する話題:質量分布・質量評価・磁場進化 (2007)
  • Author(s): 滝沢元和
  • Organizer: 研究会:マクロでシクロな銀河団
  • Place of Presentation: たかみや瑠璃倶楽リゾート
• [Presentation] 衝突銀河団に関する話題:質量分布・質量評価 (2007)
  • Author(s): 滝沢元和
  • Organizer: 国立天文台シミュレーションプロジェクトユーザーズミーティング
  • Place of Presentation: 国立天文台(三鷹)
• [Presentation] 銀河団の質量評価について (2007)
  • Author(s): 滝沢元和・薙野綾・松下恭子
  • Organizer: 璃論墾シンポジウム「宇宙物理学の未解決問題」
  • Place of Presentation: 京都大学
• [Remarks] 「研究会:マクロでミクロな銀河団」2007年10月24-26日たかみや瑠璃倶楽リゾート
  • URL: http://astr-www.kj.yamagata-u.ac.jp/~zao2007
• [Remarks] 「研究会:マクロでミクロな銀河団」2007年10月24-26日たかみや瑠璃倶楽リゾート
  • URL: http://astr-www.kj.yamagata-u.ac.jp/~zao2007/