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Full-Text Articles in Physical Sciences and Mathematics
The Halo Occupation Distribution And The Physics Of Galaxy Formation, Aa Berlind, Dh Weinberg, Aj Benson, Cm Baugh, S Cole, R Dave, Cs Frenk, A Jenkins, N Katz, Cg Lacey
The Halo Occupation Distribution And The Physics Of Galaxy Formation, Aa Berlind, Dh Weinberg, Aj Benson, Cm Baugh, S Cole, R Dave, Cs Frenk, A Jenkins, N Katz, Cg Lacey
Astronomy Department Faculty Publication Series
The halo occupation distribution (HOD) describes the bias between galaxies and dark matter by specifying (1) the probability P(N|M) that a halo of virial mass M contains N galaxies of a particular class and (2) the relative spatial and velocity distributions of galaxies and dark matter within halos. We calculate and compare the HODs predicted by a smoothed particle hydrodynamics (SPH) simulation of a ΛCDM cosmological model (cold dark matter with a cosmological constant) and by a semianalytic galaxy formation model applied to the same cosmology. Although the two methods predict different galaxy mass functions, …