Cosmological Simulation of Galaxy Groups and Clusters-I: Global Effect
  of Feedback from Active Galactic Nuclei
  In this study we quantify the properties of the gas and dark matter around
active galactic nuclei (AGN) in simulated galaxy groups and clusters and
analyze the effect of AGN feedback on the surrounding intra-cluster (group)
medium. Our results suggest downsizing of AGN luminosity with host halo mass,
supporting the results obtained from clustering studies of AGN. By examining
the temperature and density distribution of the gas in the vicinity of AGN we
show that due to feedback from the central engine, the gas gets displaced from
the centre of the group/cluster resulting in a reduction of the density but an
enhancement of temperature. We show that these effects are pronounced at both
high and low redshifts and propose new observables to study the effect of
feedback in higher redshift galaxies. We also show that the average stellar
mass is decreased in halos in the presence of AGN feedback confirming claims
from previous studies. Our work for the first time uses a fully
cosmological-hydrodynamic simulation to evaluate the global effects of AGN
feedback on their host dark matter halos as well as galaxies at scales of
galaxy groups and clusters.
