The Dependence of Galaxy Type on Host Halo Mass

Details The Dependence of Galaxy Type on Host Halo Mass The Dependence of Galaxy Type on Host Halo Mass

2006-07-26

arxiv.org/abs/astro-ph/0607585v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures. To appear in the proceedings of the XLIst Rencontres de Moriond, XXVIth Astrophysics Moriond Meeting: "Fro

Scientific paper

We examine the relation between galaxy properties and environment in the SDSS DR2, quantifying environment in terms of the mass of the host halo, which is obtained with a new iterative group finder. We find that galaxy type fractions scale strongly and smoothly with halo mass, but, at fixed mass, not with luminosity. We compare these findings with the semi-analytical galaxy formation model of Croton et al. (2006). The discrepancies we find can be explained with an oversimplified implementation of strangulation, the neglect of tidal stripping, and shortcomings in the treatments of dust extinction and/or AGN feedback.

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