NAOC Open IR  > 星系宇宙学研究部
The mass-temperature relation of 22 nearby clusters
Xu, HG; Jin, GX; Wu, XP
2001-05-20
Source PublicationASTROPHYSICAL JOURNAL
Volume553Issue:1Pages:78-83
AbstractWe present a new investigation of the mass-temperature (M-tot-T-x) relation of 22 nearby clusters based on the analysis of their ROSAT X-ray surface brightness profiles (S-x[r]) and their ASCA emission-weighted temperatures. Two methods of the cluster mass estimations are employed and their results are compared: (1) the conventional beta -model for gas distribution along with the isothermal and hydrostatic equilibrium assumptions, and (2) the NFW profile for dark matter distribution whose characteristic density and length are determined by the observed S-x(r). These two models yield essentially the same goodness of fits far S-x(r) and the similar M-tot-T-x relations, with the latter demonstrating a significant departure from the simple gravitational scaling of M-tot proportional to T-x(3/2). It is also shown that the best-fit M-tot-T-x relations could be reconciled with the theoretical expectation if the low-temperature clusters (T-x < 3.5 keV) are excluded from the list, which lends support to the scenario that the intracluster medium is preheated in the early phase of cluster formation. Together with the entropy-temperature distribution, the existence of a similarity break at T-x = 3-4 keV in the dynamical scaling relations for galaxy clusters has been confirmed.
KeywordGalaxies : Clusters : General Intergalactic Medium X-rays : Galaxies
Indexed BySCI
Language英语
WOS IDWOS:000169280400008
Citation statistics
Cited Times:56[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8620
Collection星系宇宙学研究部
Affiliation1.Shanghai Jiao Tong Univ, Dept Appl Phys, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Beijing Astron Observ, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Xu, HG,Jin, GX,Wu, XP. The mass-temperature relation of 22 nearby clusters[J]. ASTROPHYSICAL JOURNAL,2001,553(1):78-83.
APA Xu, HG,Jin, GX,&Wu, XP.(2001).The mass-temperature relation of 22 nearby clusters.ASTROPHYSICAL JOURNAL,553(1),78-83.
MLA Xu, HG,et al."The mass-temperature relation of 22 nearby clusters".ASTROPHYSICAL JOURNAL 553.1(2001):78-83.
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