May 9
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 new
radiative and momentum based mechanical AGN feedback
model in a three-dimensional smoothed-particle
hydrodynamics (SPH) code. A modeling of AGN mechanical
feedback via winds as observed in broad absorption line (BAL)
systems that include mass and momentum feedback will be
described. I will also describe the treatment of X-ray radiative
effects of AGN and a more accurate black hole accretion
rate prescription using the Bondi radius criterion. I will discuss
the new feedback model properties using simulations of an
isolated disc galaxy that include a BH, and compare them to
the previous thermal feedback properties and to what we see
from local Seyferts. Additionally, I will summarize the results of
our study of AGN feedback in major merger simulations.