Semi-Analytic Models for Dark Matter Halos

Details Semi-Analytic Models for Dark Matter Halos Semi-Analytic Models for Dark Matter Halos

2000-03-21

arxiv.org/abs/astro-ph/0003302v1

Astronomy and Astrophysics

Astrophysics

19 pages including 7 figures, submitted to the Astrophysical Journal

Scientific paper

Various analytic expressions have been proposed for the density profile of dark matter halos. We consider six of these expressions for which the density profile has a power-law fall-off rho proportional to r^{-3} at large radii and a power-law cusp rho proportional to r^{-gamma} (gamma=0, 1/2, 1, 3/2) at small radii. The phase-space distribution function for these models is calculated assuming spherical symmetry and either an isotropic velocity dispersion tensor or an anisotropic dispersion tensor of the type proposed by Osipkov and Merritt. The differential energy distribution for these models is also derived. Several applications are discussed including the analysis of dark matter search experiments and the study of halo formation in a cosmological setting. Analytic fitting formulae for some of the models are provided.

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