RIKEN (Institute of Physical and Chemical Research)
Institute of Astronomy and Astrophysics, Academia Sinica
Department of Physics, The University of Tokyo
Department of Physics, Yamagata University
Institute of Astronomy and Astrophysics, Academia Sinica
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
100 - 101
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）
Using Suzaku, we detected X-ray emission from the intra cluster medium (ICM) in Abell 1689 out to its Virial radius (15.8 min = 2.9 Mpc). The ICM temperature gradually decreases from approximately 9 keV at the center to approximately 2 keV at outskirts. Moreover, we found that the temperature of a northeast region at the Virial radius is higher (approximately 5 keV) than the other azimuth regions at the same distances, and that X-ray surface brightness at the 5 keV region is approximately 2 times higher than that of the other regions. Since the cooling function at 5 keV is approximately 50 % larger than that at 2 keV assuming the metal abundance is 0.1 solar, the difference of ICM densities between the 5 keV and 2 keV regions is not large, at most approximately 20 %. By combining the temperature and ICM density, entropy of the 5 keV region becomes approximately 2 times larger than those of the other azimuth regions. This suggests that some heating process such as cosmological structure formation shock or sub-cluster mergers in the northwest region. The Sloan Digital Sky Survey (SDSS) data, however, shows no significant luminosity excess in i band in this region. Now we are comparing the temperature profile we obtained with that derived from the mass profile of Abell 1689 which has been obtained precisely by strong and weak lensing analyses of Subaru/Suprime-Cam and HST/ACS. By this analysis, the hydrostatic equlibrium around the Virial radius will be tested.
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
Suzaku Detection of the ICM Emission out to the Virial Radius in Abell 1689
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