Query : 2001A&A...372..381C

2001A&A...372..381C - Astronomy and Astrophysics, volume 372, 381-385 (2001/6-3)

Observational tests of the δc-Mvir relation in hierarchical clustering models.

CHENG L.-M. and WU X.-P.

Abstract (from CDS):

Observational determinations of the correlation between the characteristic density δc and the virial mass Mvir 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 δc-Mvir relation over a broad mass range from 1010M to 1015M, which is in gross consistency with the prediction of a flat cosmological model with ΩM=0.3 and ΩΛ=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≃-1 for initial density fluctuations, may suffer from nongravitational heating influence especially in low-mass systems.

Abstract Copyright:

Journal keyword(s): cosmology: observations - dark matter - galaxies: formation

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 2MAXI J0254+416 ClG 02 54 32.2 +41 35 10           ~ 304 1
2 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 287 1
3 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6288 0
4 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 562 1

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