Department of Astronomy, University of Virginia
Department of Astronomy, University of Virginia
出版者
宇宙航空研究開発機構
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料:
雑誌名(英)
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
巻
JAXA-SP-09-008E
ページ
88 - 89
発行年
2010-02-26
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
抄録（英）
The radio galaxy Cygnus A lies in a cooling core cluster which is currently undergoing a major merger with a particularly simple geometry mainly along the line of sight. The radial velocity distribution of member galaxies can be separated into two subgroups (Ledlow et al. 2005) separated by a velocity difference of about 2000 km/s, which is consistent with the expectation from the ASCA temperature map (Markevitch et al. 1999) showing a shocked region between the two subclusters. Here, we present a recent 43 ks Suzaku XIS observation of these merging subclusters. The redshifts of the Fe-Kalpha and Kbeta lines monotonically increase from Cygnus A towards the other subcluster, and we find a radial velocity difference between them of 2650 +/- 900 km/s, consistent with the sense and magnitude of the galaxy velocities. Also, we confirm the temperatures measured with ASCA for the Cygnus A cluster, the merger region, and the subcluster of kT = 4.8 +/- 0.1, 9.0 +/- 0.8, and 6.4 +/- 0.4 keV, respectively.
内容記述（英）
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
The Merger Dynamics of the Cygnus A Cluster: Direct Detection of the Subcluster Infall Velocity
64574030.pdf
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