NAOC Open IR  > 星系宇宙学研究部
Reexamination of the galaxy formation-regulated gas evolution model in groups and clusters
Wu, XP; Xue, YJ
AbstractAs an alternative explanation of the entropy excess and the steepening of the X-ray luminosity-temperature relation in groups and clusters, the galaxy formation regulated gas evolution (GG) model proposed recently by Bryan makes an attempt to incorporate the formation of galaxies into the evolution of gas without additional heating by nongravitational processes. This seems to provide a unified scheme for our understanding of the structures and evolution of both galaxies and gas in groups and clusters. In this paper, we present an extensive comparison of the X-ray properties of groups and clusters predicted by the GG model and those revealed by current X-ray observations, using various large data sources in the literature and also taking the observational selection effects into account. These include an independent check of the fundamental working hypothesis of the GG model (i.e., galaxy formation was less efficient in rich clusters than in groups), a new test of the radial gas distributions revealed by both the gas mass fraction and the X-ray surface brightness profiles, and a reexamination of the X-ray luminosity-temperature and entropy-temperature relations. In particular, it shows that the overall X-ray surface brightness profiles predicted by the GG model are very similar in shape and insensitive to the X-ray temperature and that the shallower X-ray surface brightness profiles seen at low-temperature systems may arise from the current observational selection effect. This can be used as the simplest approach to distinguishing between the GG model and the preheating scenario. The latter yields an intrinsically shallower gas distribution in groups than in rich clusters.
KeywordCosmology : Theory Galaxies : Clusters : General X-rays : Galaxies : Clusters
Indexed BySCI
WOS IDWOS:000174876800012
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Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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GB/T 7714
Wu, XP,Xue, YJ. Reexamination of the galaxy formation-regulated gas evolution model in groups and clusters[J]. ASTROPHYSICAL JOURNAL,2002,569(1):112-121.
APA Wu, XP,&Xue, YJ.(2002).Reexamination of the galaxy formation-regulated gas evolution model in groups and clusters.ASTROPHYSICAL JOURNAL,569(1),112-121.
MLA Wu, XP,et al."Reexamination of the galaxy formation-regulated gas evolution model in groups and clusters".ASTROPHYSICAL JOURNAL 569.1(2002):112-121.
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