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	Collisional interaction limits between dark matter particles and baryons in 'cooling flow' clusters
	Hu, Jian ; Lou, Yu-Qing
	2010-05-06 ; 2010-05-06
关键词	radiation mechanisms : general galaxies : clusters : general cooling flows cosmology : theory dark matter X-rays : galaxies : clusters X-RAY-CLUSTERS UNIVERSAL DENSITY PROFILE XMM-NEWTON OBSERVATION SELF-SIMILAR SOLUTIONS GALAXY CLUSTERS MAGNETIC-FIELDS ENVELOPE EXPANSION PERSEUS CLUSTER POLYTROPIC GAS CORE COLLAPSE Astronomy & Astrophysics
中文摘要	Presuming weak collisional interactions to exchange the kinetic energy between dark matter and baryonic matter in a galaxy cluster, we re-examine the effectiveness of this process in several 'cooling flow' galaxy clusters using available X-ray observations and infer an upper limit on the heavy dark matter particle (DMP)-proton cross-section sigma(xp). With a relative collisional velocity V-dependent power-law form of sigma(xp) = sigma(0)(V/10(3) km s(-1))(a) where a <= 0, our inferred upper limit is sigma(0)/m(x) less than or similar to 2 x 10(-25) cm(2) GeV-1 with m(x) being the DMP mass. Based on a simple stability analysis of the thermal energy balance equation, we argue that the mechanism of DMP-baryon collisional interactions is unlikely to be a stable non-gravitational heating source of intracluster medium (ICM) in inner core regions of 'cooling flow' galaxy clusters.
语种	英语 ; 英语
出版者	BLACKWELL PUBLISHING ; OXFORD ; 9600 GARSINGTON RD, OXFORD OX4 2DQ, OXON, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/14870]
专题	清华大学
推荐引用方式 GB/T 7714	Hu, Jian,Lou, Yu-Qing. Collisional interaction limits between dark matter particles and baryons in 'cooling flow' clusters[J],2010, 2010.
APA	Hu, Jian,&Lou, Yu-Qing.(2010).Collisional interaction limits between dark matter particles and baryons in 'cooling flow' clusters..
MLA	Hu, Jian,et al."Collisional interaction limits between dark matter particles and baryons in 'cooling flow' clusters".(2010).

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