Speaker
Description
We present a systematic study of the nuclear X-ray
luminosity function (XLF) of Brightest Cluster Galaxies (BCGs) for a
wide range of halo masses, exploiting the entire Chandra archive (~600
BCGs). Thanks to the ~1 arcsec angular resolution, we are able to
trace their radiatively-efficient nuclear activity through cosmic
epochs from z=0.1 to z~>1, and to investigate the properties of the
surrounding ICM. This work complements the measurement or radio
emission of BCGs in the studies of feedback mechanisms across cosmic
epochs in massive galaxy clusters, showing an increase in the feedback
intensity with redshift, and, possibly, a switch in the feedback mode
from mechanical to radiative. Our final goal is to constrain the
cycle of hot and cold baryons in the core of groups and clusters of
galaxies, including the origin of the feeding gas, the accretion
regime, and the effects of feedback onto the surrounding ICM and on
the star formation in the BCGs.
| Affiliation | INAF - Osservatorio Astrofisico di Arcetri |
|---|---|
| Topic | Active Galactic Nuclei: accretion physics and evolution across cosmic time |
