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FIELD Colloquium: Physics
DATE March 06 (Wed), 2019
TIME 16:00-17:30
PLACE 1503
SPEAKER Ena Choi
HOST Lee, Sungjay
INSTITUTE Columbia University
TITLE Making Massive Elliptical Galaxies
ABSTRACT

Feedback from active galactic nuclei (AGNs) at the centers of galaxies is believed to play a major role during galaxy formation and evolution of those galaxies and central black holes (BHs). However, in many popular treatment 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 AGN on physical properties of massive elliptical galaxies. I will discuss how AGN feedback plays an important 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 that are created inside the galaxies themselves (in situ) and those that are created outside (ex situ) and are accreted later on.

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