Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-09
Astronomy and Astrophysics
Astrophysics
5 pages, 1 figure, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20010507
Observational 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 to 10**15 solar masses, which is in gross consistency with the prediction of a flat cosmological model with Omega_M=0.3 and Omega_Lambda=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.
Cheng Ling-Mei
Wu Xiang-Ping
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