Evolutionary tracks for the black holes of galaxy simulations with cooling. All simulations accrete for a long time near the Eddington limit (black line). Depending on the initial conditions they leave this evolutionary path at different black hole masses and then show strongly declining AGN luminosities. The dashed black line indicates the sub-Eddington limit for redshifts of 0.6 < z < 0.8 from Steinhardt & Elvis (2010).