Study of thermal and chemical history of baryon

2012 Fiscal Year Final Research Report

• Project/Area Number: 22540256
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Tokyo University of Science
• Principal Investigator: MATSUSHITA Kyoko 東京理科大学, 理学部, 准教授 (50366423)
• Project Period (FY): 2010 – 2012
• Keywords: X線天文学 / 銀河 / 銀河団

Research Abstract

We studied distribution of metals in intracluster medium of clusters of galaxies, and found that metals synthesized early phase in cluster formation. In addition, we derived total Fe mass in the intracluster medium out to the virial radius for the first time. Comparing the Fe mass and stellar mass, we constrained the initial mass function of stars in cluster galaxies, and supernova Ia rate in the past. We also studied thermal properties in the intracluster medium of cluster outskirt out to the virial radius. Especially, we found that the entropy profiles of the intracluster medium do not depend on the system mass, when scaled with average temperature of the intracluster medium. Beyond a half of the virial radius, the entropies of the ICM are systematically lower than the predicted valuesassuming pure gravitational heating. We also found that the hydrostatic mass is smaller than the gravitational mass derived from gravitational lens observations. This result indicates that the intracluster medium in the cluster outskirt deviates from the hydrostatic equibrium. Infalling matter may have retained some of its kinetic energy in the form of bulk motions or turbulence.

Research Products

• [Journal Article] Observations of the Outskirts of A1835:Deviation from Hydrostatic Equilibrium (2013)
  • Author(s): Ichikawa, K., K. Matsushita, et al. Suzaku
  • Journal Title: The Astrophysical Journal Pages: 90
  • DOI: doi:10.1088/0004‐637X/766/2/90 v766
• [Journal Article] Distribution of Si (2013)
  • Author(s): Matsushita, K., T. Sato, E. Sakuma, & K. Sato
  • Journal Title: Fe, and Ni in the Intracluster Medium of the Coma Cluster Publications of the Astronomical Society of Japan Volume: v65 Pages: 10
• [Journal Article] Metal‐mass‐to‐light Ratios of the Perseus Cluster Out to the Virial Radius (2013)
  • Author(s): Matsushita, K., E. Sakuma, T. Sasaki, K. Sato, & A. Simionescu
  • Journal Title: The Astrophysical Journa Pages: 147
  • DOI: doi:10.1088/0004‐637X/764/2/147 v764
• [Journal Article] Spatial Distribution of Abundance Patterns in the Starburst Galaxy NGC 3079 Revealed with Chandra and Suzaku (2012)
  • Author(s): Konami, S., K. Matsushita, P. Gandhi, & T. Tamagawa
  • Journal Title: Publications of the Astronomical Society of Japan Volume: v64 Pages: 117
• [Journal Article] Observations of the Hydra A Cluster out to the Virial Radius (2012)
  • Author(s): Sato, T., T. Sasaki, K. Matsushita, et al. Suzaku
  • Journal Title: Publications of the Astronomical Societyof Japan Volume: v64 Pages: 95
• [Journal Article] Observations of Iron K‐Lines from the Intracluster Medium of the Coma Cluster ociety (2011)
  • Author(s): Sato, T., K. Matsushita, N. Ota, K. Sato, K. Nakazawa, & C. L. Sarazin Suzaku
  • Journal Title: Publications of the Astronomical S(7) of Japan Volume: v63 Pages: 991
• [Journal Article] Observations of Metal Distributions in the Intracluster Medium of the Centaurus Cluster l Society (2011)
  • Author(s): Sakuma, E., N. Ota, K. Sato, T. Sato, & K. Matsushita Suzaku
  • Journal Title: Publications of the Astronomicaof Japan Volume: v63 Pages: 979
• [Journal Article] Observations of the Fornax Cluster: Temperature and Metallicity Distribution (2011)
  • Author(s): Murakami, H., M. Komiyama, K. Matsushita, R. Nagino, T. Sato, K. Sato, M. Kawaharada, K. Nakazawa, T. Ohashi, & Y. Takei Suzaku and XMM‐Newton
  • Journal Title: Publications of the Astronomical Societyof Japan Volume: v63 Pages: 963
• [Journal Article] Metal Abundance Patterns in the Outflow Region of M82 and the Importance of Charge Exchange (2011)
  • Author(s): Konami, S., K. Matsushita, T. G. Tsuru, P. Gandhi, & T. Tamagawa Suzaku
  • Journal Title: Publications of the Astronomical Society of Japan Volume: v63 Pages: 913
• [Journal Article] Radial profiles of Fabundance in the intracluster medof nearby clusters observed with e ium XMM‐Newton (2011)
  • Author(s): Matsushita, K
  • Journal Title: Astronomy and Astrophysics Volume: pA134
  • DOI: doi:10.1051/0004‐6361/200913432 v527
• [Journal Article] Metallicity of the Fossil Group NGC 1550 Observed with Suzaku (2010)
  • Author(s): Sato, K., M. Kawaharada, K. Nakazaw K. Matsushita, Y. Ishisaki, N. Y. Yamasaki, & T. Ohashi
  • Journal Title: Publications of the Astronomical Society of Japan Volume: v62 Pages: 1445
• [Journal Article] Abundance Patterns in the Interstellar Medium of the S0 Galaxy NGC 1316 (Fornax A) Revealed with Suzaku (2010)
  • Author(s): Konami, S., K. Matsushita, R. Nagino, M. S. Tashiro, T. Tamagawa, & K. Makishima
  • Journal Title: Publications of the Astronomical Society of Japan Volume: v62 Pages: 1435
• [Presentation] Metals in clusters of galaxies observed with Suzaku and XMM-Newton (2012)
  • Author(s): Kyoko Matsushita
  • Organizer: Galaxy Clusters as Giant Cosmic Laboratories
  • Place of Presentation: Madrid, Spain
  • Year and Date: 20120000
• [Presentation] The oxygen abundance from X-rays : methods and prospects (2012)
  • Author(s): Kyoko Matsushita
  • Organizer: Mapping Oxygen in the Universe
  • Place of Presentation: Tenerife, Spain
  • Year and Date: 20120000
• [Presentation] ASTRO-H で探る銀河、銀河団の化学進化 (2012)
  • Author(s): 松下恭子
  • Organizer: 日本天文学会 2012 年春季年会
  • Place of Presentation: 龍谷大学
  • Year and Date: 20120000
• [Presentation] Metals in clusters of galaxies (2011)
  • Author(s): Kyoko Matsushita
  • Organizer: Chemical Evolution of the Universe 2011
  • Place of Presentation: Tokyo Metropolitan University
  • Year and Date: 20110000
• [Presentation] ケンタウルス座銀河団中心領域からのCr, Mn 輝線の検出と Ia 型超新星による重元素合成 (2011)
  • Author(s): 松下恭子
  • Organizer: 日本天文学会 2011 年秋季年会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 20110000
• [Presentation] Suzaku and XMM observations of distribution of metals in the intracluster medium (2010)
  • Author(s): Kyoko Matsushita
  • Organizer: Galaxy clusters: observations, physics and cosmology
  • Place of Presentation: MPE/Garching
  • Year and Date: 20100000
• [Presentation] Metal abundances in the intracluster medium observed with XMM and Suzaku (2010)
  • Author(s): Kyoko Matsushita
  • Organizer: CL J2010+0628: from Massive Galaxy Formation to Dark Energy
  • Place of Presentation: IPMU/Kashiwa, University of Tokyo
  • Year and Date: 20100000
• [Presentation] Abundance Measurements in Clusters (2010)
  • Author(s): Kyoko Matsushita
  • Organizer: Cosmic Chemical Evolution Workshop
  • Place of Presentation: St. Michael's conference center
  • Year and Date: 20100000