Massive Neutrinos and Galaxy Formation

Abstract

We report the most recent results from high-resolution numerical simulations of structure formation in two flat cold+hot dark matter models with neutrino mass densities \onu=0.2 and 0.3. We find that structure forms too late in all CDM+HDM models with \onu>0.2 to account for the amount of dense neutral gas in high-redshift damped Lyman-$\alpha$ systems. The \onu=0.2 model at $z\approx0$ provides a better match to observations than the pure CDM model.Comment: 5 pages including 3 figures, uuencoded compressed postscript. To appear in the Proceedings of the 5th Annual Astrophysics Conference in Maryland "Dark Matter