Triggering Active Galactic Nuclei in galaxy clusters
  We model the triggering of Active Galactic Nuclei (AGN) in galaxy clusters
using the semi- analytic galaxy formation model SAGE (?). We prescribe
triggering methods based on the ram pressure galaxies experience as they move
throughout the intracluster medium, which is hypothesized to trigger star
formation and AGN activity. The clustercentric radius and velocity distribution
of the simulated active galaxies produced by these models are compared with
that of AGN and galaxies with intense star formation from a sample of
low-redshift, relaxed clusters from the Sloan Digital Sky Survey. The ram
pressure triggering model that best explains the clustercentric radius and
velocity distribution of these observed galaxies has AGN and star formation
triggered if $2.5\times10^{-14} < P_{ram} < 2.5\times10^{-13}$ Pa and $P_{ram}
> 2P_{internal}$; this is consistent with expectations from hydrodynamical
simulations of ram-pressure induced star formation. Our results show that ram
pressure is likely to be an important mechanism for triggering star formation
and AGN activity in clusters.
