On the impact of AGN feedback modes onto the turbulent properties of the multiphase intracluster medium
Stefano Sotira (DIFA - Università di Bologna)
Tuesday 04/02/2025 @ 14:00, Sala Antonio Sollima (IV piano Battiferro)
The feedback from active galactic nuclei (AGN) plays a crucial role in regulating the thermodynamics and the dynamics of the intracluster medium (ICM). In this talk, I will show you new simulations done with ENZO , simulating the self-regulated cycles of AGN feedback, to study the turbulent motions created by it in a Perseus-like cool core cluster. We study in detail different feedback modes: from pure kinetic precessing jets up to almost pure thermal feedback. Our analysis reveals that the gas velocity dispersion in the center of the cluster correlates in time with the peaks of the AGN activity and that different feedback modalities can produce the velocity dispersion observed in the Perseus cluster while leading to distinct geometrical distributions and velocity dispersion profiles. Moreover, we do not find a significant kinematic coupling between the hot and the cold phase kinematics. We find a correlation between the AGN activity and the steepening of the velocity structure function (VSF) and that the projected 2D VSF slopes are not trivially correlated with the 3D VSF ones. This line of research will allow us to use incoming detections of gas turbulent motions detectable by XRISM (or future instruments) to better constrain the duty cycle, energetics and energy dissipation modalities of AGN feedback in massive clusters of galaxies.