The second coming of cold dark matter?

Details The second coming of cold dark matter? The second coming of cold dark matter?

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..397z&link_type=abstract

Dark matter. AIP Conference Proceedings, Volume 336, pp. 397-406 (1995).

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Dark Matter

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While the standard cold dark matter (CDM) model has received numerous marks against it on the basis of a variety of observational data, the prediction of high σv, the pairwise-velocity dispersion between galaxies, on small (megaparsec) scales was reported as perhaps one of its greatest failings. Here, we reexamine the case of CDM and σv with high-resolution numerical simulations. The σv statistic was measured in simulations, in artificial galaxy catalogs, and the CfA North Forty redshift survey. In our reanalysis of the CfA data, we found that σv~500 km/s, significantly higher than the original estimates of Davis & Peebles (1983). This new value, along with our estimate of the velocity bias, leads to a virial measure of the cosmological density parameter, Ω~0.9, which is more than four times the traditionally cited CfA result. Analysis of the simulations indicates that while the method of Davis and Peebles works well, the σv statistic itself is not generally robust: there is large scatter from catalog to catalog and evidence that the recovered σv value depends strongly on a small fraction of galaxies in the central regions of rare, massive clusters. Thus, at present the CDM model cannot be deemed incompatible with observed small-scale peculiar velocities.

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