2:30pm Monday January 11 in Curia II
Understanding the relationship between the mass density field and the galaxy density field is necessary in order to properly interpret observations of the large-scale galaxy distribution. We present results of hydrodynamic simulations of the formation of galaxies in a cosmological context. At redshift zero, the bias between galaxies and mass depends on scale and on galaxy age. For younger galaxies, there is significant scatter in the relationship between galaxies and mass. These effects can be understood in terms of the importance of temperature to galaxy formation. Redshift dependence of the bias is caused by two effects: first, the bias of galaxy formation declines with time; second, after formation, the bias of galaxies declines due to gravitational evolution. We show that our results are consistent with current observations. Furthermore, the evolution of the clustering of galaxy formation should be an observable signature of our galaxy formation model, using upcoming redshift surveys such as the Sloan Digital Sky Survey.