Velocity Distribution of Dark Matter Halos in a Λ Cold Dark Matter Universe

Details Velocity Distribution of Dark Matter Halos in a Λ Cold Dark Matter Universe Velocity Distribution of Dark Matter Halos in a Λ Cold Dark Matter Universe

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347904t&link_type=abstract

American Astronomical Society, AAS Meeting #213, #479.04; Bulletin of the American Astronomical Society, Vol. 41, p.446

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Scientific paper

The existence of a bullet cluster (such as 1E0657-56) poses a challenge to the concordance Lambda cold dark matter model. Here we investigate the velocity distribution of dark matter halos in a large N-body simulations. We examine various basic statistics and the relative velocities of DM halos in the simulations, and compare the results to the observed relative velocity of 1E0657-56, which has a shock velocity of 4740 km/s. Our preliminary result suggests that there are no pairs with such a high relative velocity in a volume of (1 h-1 Gpc)3. We discuss the implications of our results, future plans, and possible problems.

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