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The Dependence of Velocity and Clustering Statistics on Galaxy Properties

By A. J. Benson, C. M. Baugh, S. Cole, C. S. Frenk and C. G. Lacey


We use a combination of N-body simulations of the hierarchical clustering of dark matter and semi-analytic modelling of the physics of galaxy formation to probe the relationship between the galaxy distribution and the mass distribution in a flat, cold dark matter universe with mean density Ω0 = 0.3 (ΛCDM). We find that the statistical properties of the galaxy distribution in the model, as quantified by pairwise velocity dispersions and clustering strength, can be quite different from those displayed by the dark matter. The expected pairwise line-of-sight velocity dispersion of galaxies is ∼ 40 % lower than that of the dark matter, and is in reasonable agreement with the values measured in the Las Campanas redshift survey by Jing et al. over two decades in pair separation. The origin of this offset is statistical rather than dynamical, and depends upon the relative efficiency of galaxy formation in dark matter halos of different mass. Although the model galaxies and the dark matter have markedly different correlation functions in real space, such biases conspire to cause the redshift space correlation functions to be remarkably similar to each other. Thus, althoug

Year: 2008
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