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Observational tests of the delta(c) M-vir relation in hierarchical clustering models
Cheng, LM; Wu, XP
AbstractObservational determinations of the correlation between the characteristic density delta (c) and the virial mass M-vir of dark halos constitute a critical test for models of hierarchical structure formation. Using the dynamical properties of dark halos reconstructed from the galaxy distributions in massive systems (groups/clusters) and the rotation curves in less massive systems (dwarf, low surface brightness and spiral galaxies) drawn from the literature, we confirm the existence of the delta (c)-M-vir relation over a broad mass range from 10(10) M-circle dot to 10(15) M-circle dot, which is in gross consistency with the prediction of a at cosmological model with Omega (M) = 0.3 and Omega (A) = 0.7. It is pointed out that previous analyses based on the measurements of X-ray emitting gas and the hydrostatic equilibrium hypothesis, which claimed a shallower scale-free spectrum of n approximate to -1 for initial density fluctuations, may suffer from nongravitational heating influence especially in low-mass systems.
KeywordCosmology : Observations Dark Matter Galaxies : Formation
Indexed BySCI
WOS IDWOS:000169963800008
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
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GB/T 7714
Cheng, LM,Wu, XP. Observational tests of the delta(c) M-vir relation in hierarchical clustering models[J]. ASTRONOMY & ASTROPHYSICS,2001,372(2):381-385.
APA Cheng, LM,&Wu, XP.(2001).Observational tests of the delta(c) M-vir relation in hierarchical clustering models.ASTRONOMY & ASTROPHYSICS,372(2),381-385.
MLA Cheng, LM,et al."Observational tests of the delta(c) M-vir relation in hierarchical clustering models".ASTRONOMY & ASTROPHYSICS 372.2(2001):381-385.
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