Clusters of galaxies are fantastic laboratories for understanding the physics of AGN feedback. They play a pivotal role in our understanding of jet-mode feedback by demonstrating that AGN-driven jets can inject profound amounts of energy into their surroundings via shock fronts, sound waves and turbulence, in addition to driving powerful molecular outflows and metals out of galaxies. In this...
Among the most notorious sources belonging to the Third Cambridge Catalogue is 3C84, active galactic nuclei of NGC 1275, the Perseus cluster’s brightest galaxy. It is the origin of a complex interaction between radio jets and the cluster’s environment, releasing relativistic particles on large distances. On the other hand, the hierarchical merging of subclusters and groups, from which cluster...
I will review the observed variability of the low accretion
rate AGN in Brightest Cluster Galaxies (BCGs). Radio/sub-mm
monitoring of a sample of several dozen systems over the past decade
shows most systems have varied by >30% and many by factors of >2.
The implications of this variability, particularly in the sub-mm,
will be discussed.
The presence of relativistic particles and diffuse magnetic field in cluster volumes is unveiled
by the observation of synchrotron radio emission extended on Mpc scales in the form of radio
relics and halos. Their origin is connected with merger processes, but the underlying particle acceleration mechanisms are still debated. A possible scenario calls upon the presence of a fossil population...
