Simulations of AGN jet feedback in galaxy clusters: heating and cooling cycles

Abstract

I will present results from hydrodynamic simulations of AGN jets interacting with the intracluster medium (ICM). Cold gas condensation (triggered by local thermal instability) and a sudden increase in feedback heating result in overheating of the ICM. Such overheating prevents further cooling and accretion of gas onto the central black hole. In absence of heating the core slowly cools again, restarting the heating cycle. Feedback heating driven by cold gas condensation leads to a large scatter between jet power, cold gas mass, core entropy, etc. I will highlight the importance of angular momentum of cold gas in closing the feedback heating loop. I will compare the kinematics of cold gas in our simulations with the ALMA observations of cold gas in cluster cores.