The presence of hot, volume-filling gas in galaxy clusters and groups allows for studying various astrophysical processes. In this review talk, I will highlight selected results on cluster mergers and ICM shocks, AGN feedback, and plasma physics, focusing on recent X-ray and radio observations and numerical modeling.
Galaxy clusters form in the intersections of the cosmic web and grow through mergers and accretion of smaller substructures transported by the cosmic web filaments. Hence, the outskirts of galaxy clusters are important for studying the signatures of the accretion processes and detecting the elusive cosmic filaments, which are the key to solving the ”missing” baryons problem.
Despite its...
eROSITA allows us to resolve the entire Virgo Cluster and its outskirts on scales between 1 kpc and 3 Mpc, covering a total area on the sky of about 25 by 25 degrees. We present an exploration of the SRG/eROSITA data of the Virgo Cluster from five all-sky surveys. We utilize image manipulation techniques and surface brightness profiles to search for extended emission, surface brightness...
The Fornax cluster is one of the most nearby X-ray bright galaxy groups. Its proximity allows us to study its properties at high spatial resolution. We exploit the essentially unlimited field-of-view of five eROSITA all-sky surveys to study the Fornax cluster from kpc to Mpc scale, tracing the intracluster medium out to beyond the virial radius. We interpret the observations in combination...
Cosmological simulations predict the presence of warm, thermal gas in the cosmic filaments that connect galaxy clusters. This gas is thought to constitute an important part of the missing baryons in the Universe. In addition to the thermal gas, radio observations show that cosmic filaments between close pairs of galaxy clusters are filled with a population of relativistic particles and...
