Dark Halos and Galaxy Evolution

Abstract

We study the evolution of disk galaxies within the frame of the cold dark matter (CDM) cosmologies. The hydrodynamics of a centrifugally supported gaseous disk and the growth of a stellar disk are calculated in detail taking into account the energy balance of the ISM and the gravitational instabilities that concern gas and stars. The halo density profile is derived from the primordial cosmological conditions and its gravitational contraction produced by the disk is included. Several features of the spiral galaxies at different redshifts are predicted, and the main factors which influence on these features are found. A strong evidence is provided that the Tully-Fisher relation is an imprint of the primordial cosmological conditions.

8 pages, 6 eps figures, uses iopconf1.sty. To appear in proceedings of the Second International Workshop on Dark Matter in Astro and Particle Physics, eds. H.V.Klapdor-Kleingrothaus and L.Baudis