Suzaku observations of Kalpha lines of iron from intracluster medium of the Coma cluster

佐藤, 琢哉, 松下, 恭子, 太田, 直美, 薙野, 綾, 中澤, 知洋, Sato, Takuya, Matsushita, Kyoko, Ota, Naomi, Nagino, Ryo, Nakazawa, Kazuhiro, Sarazin, Craig L.

The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan

We studied temperature structure of the intracluster medium, possible bulk motions, and Fe and Ni nucleosynthesis in the Coma cluster with Suzaku. The temperatures derived from observed ratios of H-like and He-like Fe Kalpha lines agree well with those from spectral fitting with the single-temperature APEC model in the 1.0 - 8.0 keV and 5.0 - 8.0 keV bands. Since the line ratio is a strong function on plasma temperature, the observed consistency indicates that single-temperature component dominates the spectrum from each cell region. The observed values of central energy of the He-like Fe line are constant within 1000 km s(exp -1), which corresponds to a calibration error. Comparing with the sound velocity of the intracluster medium, 1500 km s(exp -1), we can verify the derived total mass in the cluster based on hydrostatic ICM equilibrium. These results on temperature and velocity structures suggest that the core of the Coma cluster reached in a fairly relaxed state after the recent merging. The observed Fe abundance of the intracluster medium is almost constant at 0.45 solar. Therefore, the gas should have been well mixed during mergings. The Ni/Fe ratio is found to be close to the solar ratio. In the nucleosynthesis of Ni and Fe, there is no obvious difference the cluster and the Galaxy.

Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science

資料番号: AA0064574037

レポート番号: JAXA-SP-09-008E

Suzaku observations of Kalpha lines of iron from intracluster medium of the Coma cluster

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Suzaku observations of Kalpha lines of iron from intracluster medium of the Coma cluster

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収録刊行物

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