Galaxy clustering in cold dark matter scenario with nonvanishing cosmological constant

Details Galaxy clustering in cold dark matter scenario with nonvanishing cosmological constant Galaxy clustering in cold dark matter scenario with nonvanishing cosmological constant

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43l..17s&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 2, 1991, p. L17-L25.

Mathematics

Logic

27

Dark Matter, Galactic Clusters, Hubble Constant, Many Body Problem, Particle Motion, Astronomical Models, Correlation, Cosmology, Power Spectra, Red Shift

Scientific paper

Using N-body simulations, the formation and evolution of large-scale structures are studied in a universe dominated by cold dark matter (CDM) with a nonvanishing cosmological constant lambda 0. In particular, attention was focused on spatially flat models with a density parameter Omega 0 = (0.1-0.2) and with the Hubble constant h about 1, which are favored by a number of observational indications. When the correlation length is matched to that of the observed galaxy-galaxy correlation function in real space, it is found that CDM models with Omega(0) = 0.2 (lambda 0 = 0.8) and h = 1.0 reproduce quite well the observed correlation functions in both real and redshift space. Furthermore, the one-dimensional velocity dispersion of galaxy pairs on small scales is found to be about 600 km/s; although the value would be slightly larger than the observational estimate, it is significantly smaller than that for the Omega 0 = 1 CDM models with or without bias.

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