A CHANDRA STUDY OF TEMPERATURE DISTRIBUTIONS OF THE INTRACLUSTER MEDIUM IN 50 GALAXY CLUSTERS

	A CHANDRA STUDY OF TEMPERATURE DISTRIBUTIONS OF THE INTRACLUSTER MEDIUM IN 50 GALAXY CLUSTERS
	Zhu, Zhenghao 1; Xu, Haiguang 1,2; Wang, Jingying3 ; Gu, Junhua3 ; Li, Weitian 1; Hu, Dan 1; Zhang, Chenhao 1; Gu, Liyi 4; An, Tao 5; Liu, Chengze 1
刊名	ASTROPHYSICAL JOURNAL
	2016-01-10
卷号	816 期号:2
关键词	galaxies: clusters: general galaxies: clusters: intracluster medium X-rays: galaxies: clusters
英文摘要	To investigate the spatial distribution of the intracluster medium temperature in galaxy clusters in a quantitative way and probe the physics behind it, we analyze the X-ray spectra from a sample of 50 clusters that were observed with the Chandra ACIS instrument over the past 15 years and measure the radial temperature profiles out to 0.45r(500). We construct a physical model that takes into consideration the effects of gravitational heating, thermal history (such as radiative cooling, active galactic nucleus feedback, and thermal conduction), and work done via gas compression, and use it to fit the observed temperature profiles by running Bayesian regressions. The results show that in all cases our model provides an acceptable fit at the 68% confidence level. For further validation, we select nine clusters that have been observed with both Chandra (out to greater than or similar to 0.3r(500)) and Suzaku (out to greater than or similar to 1.5r(500)) and fit their Chandra spectra with our model. We then compare the extrapolation of the best fits with the Suzaku measurements and find that the model profiles agree with the Suzaku results very well in seven clusters. In the remaining two clusters the difference between the model and the observation is possibly caused by local thermal substructures. Our study also implies that for most of the clusters the assumption of hydrostatic equilibrium is safe out to at least 0.5r(500) and the non-gravitational interactions between dark matter and its luminous counterparts is consistent with zero.
收录类别	SCI
语种	英语
WOS记录号	WOS:000368238500006
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5472]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China 2.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.SRON Netherlands Inst Space Res, NL-3584 CA Utrecht, Netherlands 5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 6.Max Planck Inst Astrophys, D-85741 Garching, Germany 7.Shanghai Jiao Tong Univ, Dept Elect Engn, Shanghai 200240, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Zhenghao,Xu, Haiguang,Wang, Jingying,et al. A CHANDRA STUDY OF TEMPERATURE DISTRIBUTIONS OF THE INTRACLUSTER MEDIUM IN 50 GALAXY CLUSTERS[J]. ASTROPHYSICAL JOURNAL,2016,816(2).
APA	Zhu, Zhenghao.,Xu, Haiguang.,Wang, Jingying.,Gu, Junhua.,Li, Weitian.,...&Wu, Xiang-Ping.(2016).A CHANDRA STUDY OF TEMPERATURE DISTRIBUTIONS OF THE INTRACLUSTER MEDIUM IN 50 GALAXY CLUSTERS.ASTROPHYSICAL JOURNAL,816(2).
MLA	Zhu, Zhenghao,et al."A CHANDRA STUDY OF TEMPERATURE DISTRIBUTIONS OF THE INTRACLUSTER MEDIUM IN 50 GALAXY CLUSTERS".ASTROPHYSICAL JOURNAL 816.2(2016).