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We present results of an attempt to include more detailed gas physicsmotivated from hydrodynamical simulations within semi-analytic models (SAM) ofgalaxy formation, focusing on the role that environmental effects play. Themain difference to previous SAMs is that we include 'gravitational' heating ofthe intra-cluster medium (ICM) by the net surplus of gravitational potentialenergy released from gas that has been stripped from infalling satellites.Gravitational heating appears to be an efficient heating source able to preventcooling in environments corresponding to dark matter halos more massive than$\sim 10^{13} $M$_{\odot}$. The energy release by gravitational heating canmatch that by AGN-feedback in massive galaxies and can exceed it in the mostmassive ones. However, there is a fundamental difference in the way the twoprocesses operate. Gravitational heating becomes important at late times, whenthe peak activity of AGNs is already over, and it is very mass dependent. Thismass dependency and time behaviour gives the right trend to recover down-sizingin the star-formation rate of massive galaxies. Abridged...

Adding Environmental Gas Physics to the Semi-Analytic Method for Galaxy Formation: Gravitational Heating