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In large scale cosmological hydrodynamic simulations simplified sub-gridmodels for gas accretion onto black holes and AGN feedback are commonly used.Such models typically depend on various free parameters, which are not wellconstrained. We present a new advanced model containing a more detaileddescription of AGN feedback, where those parameters reflect the results ofrecent observations. The model takes the dependency of these parameters on theblack hole properties into account and describes a continuous transitionbetween the feedback processes acting in the so-called radio-mode andquasar-mode. In addition, we implement a more detailed description of theaccretion of gas onto black holes by distinguishing between hot and cold gasaccretion. Our new implementations prevent black holes from gaining too muchmass, particularly at low redshifts so that our simulations are now verysuccessful in reproducing the observed present-day black hole mass function.Our new model also suppresses star formation in massive galaxies slightly moreefficiently than many state-of-the-art models. Therefore, the simulations thatinclude our new implementations produce a more realistic population ofquiescent and star-forming galaxies compared to recent observations, even ifsome discrepancies remain. In addition, the baryon conversion efficiencies inour simulation are - except for the high mass end - consistent withobservations presented in literature over the mass range resolved by oursimulations. Finally, we discuss the significant impact of the feedback modelon the low-luminous end of the AGN luminosity function.

A refined sub-grid model for black hole accretion and AGN feedback in large cosmological simulations