Quasars, Feedback, and Galaxy Formation

摘要

Recent observations of tight correlations between supermassive black hole massesand the properties of their host galaxies demonstrate that black holes and bulges are co-evaland have motivated theoretical models in which feedback from AGN activity regulates the blackhole and host galaxy evolution. Combining simulations, analytic models, and recent observations,answers to a number of questions are starting to take shape: how do AGN get triggered? Howlong do they live? What are typical light curves and what sets them? Is feedback necessaryand/or sufficient to regulate BH growth? What effects does that feedback have on the hostgalaxy? On the host halo? All of this also highlights questions that remain wide open: how doesgas get from a few pc to the AGN? What are the actual microphysical mechanisms of feedback?What is the tradeoff between stellar and AGN feedback? And, if there are different "modes" offeedback, where/when are each important?