Speaker : 최이나 (Research Professor at Quantum Universe Center Korea Institute for Advanced Study)
Abstract : Feedback from accreting black holes (AGN feedback) at the centers of galaxies is believed to play a significant role during galaxy formation and the evolution of those galaxies and central black holes (BHs). However, in many popular treatments of AGN feedback models, some of the most basic requirements, such as the necessity that mass and momentum be conserved, have not been imposed, and the inclusion of the presently known and observed feedback processes is often treated selectively. In this talk, I will introduce our momentum-based mechanical AGN feedback model in a three-dimensional hydrodynamics code and a suite of cosmological hydrodynamical simulations I use to study the impact of accreting black holes on the physical properties of massive elliptical galaxies. I will discuss how AGN feedback plays a vital role in making massive galaxies quench their star formation, as well as in making galaxies “bigger” in size. I will describe how the different feedback components affect the two-phase character of the stars ending up in the final galaxies, i.e., stars created inside the galaxies themselves (in situ) and those made outside and are accreted later on (ex-situ).
