T he m any lives ofA G N : cooling ow s , black holes and the lum inosities and colours ofgalaxies

Darren J.Croton,Volker Springel.Sim on D.M .W hite,G.De Lucia,C.S. Frenk,L.Gao,A.Jenkins,G.Kau m ann,J.F.Navarro,N.Yoshida M ax-Planck-Institutf ur A strophysik,D -85740 G arching,G erm any. Institute for Com putationalCosm ology,Physics D epartm ent,D urham .U .K . D epartm entofPhysics and A stronom y,U niversity ofV ictoria,B.C.,Canada. D epartm entofPhysics,N agoya U niversity,Chikusa-ku,N agoya 464-8602,Japan