The cluster gas mass fraction as a cosmological probe: A revised study

被引：0
|
作者：
Ettori, Stefano [1 ]
Tozzi, Paolo [2 ]
Balestra, Italo [3 ]
Morandi, Andrea [4 ]
机构：
[1] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy
[2] Osserv Astron Trieste, INAF, I-34131 Trieste, Italy
[3] MPE, D-85748 Garching, Germany
[4] Univ Bologna, I-40127 Bologna, Italy
来源：
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT | 2007年 / 169期
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present the analysis of the baryonic content of 65 X-ray luminous galaxy clusters observed with Chandra in the redshift range 0.143-1.273. Our study aims at resolving the gas mass fraction in these objects to put constraints on the cosmological parameters Omega(m), Omega(Lambda) and the ratio between the pressure and density of the "dark" energy, w. By assuming that the galaxy clusters are representative of the cosmic baryon budget, the distribution of the cluster baryon fraction in the hottest (T-gas > 5 keV) systems as function of redshift is used to constrain the cosmological parameters. We discuss how our constraints are affected from several systematics, namely the assumed baryon fraction in stars, the depletion parameter, the sample selection.
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页码：37 / 40
页数：4
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