Galaxy Clusters Near and Far
Galaxy cluster formation is a complex interplay between gravitational collapse and astrophysical processes. This makes them unique objects that allow us to simultaneously study galaxy formation, baryonic physics, structure formation and cosmology. However, their complicated formation histories introduce systematics in their galaxy population, their intracluster medium (ICM) and their dark matter halo that limit their use as probes of astrophysics and cosmology. Current observational surveys are yielding impressive numbers of clusters out to ever increasing redshift in the optical, X-ray and radio bands. Numerical simulations of clusters are now producing populations of realistic clusters and are beginning to resolve the cluster galaxies. The aim of this session is to bring together the latest observational and theoretical results on galaxy clusters and their formation. We will discuss how the large-scale environment impacts the formation of the cluster galaxy population. We will examine how the astrophysical processes shape the structure and observational properties of the ICM and their influence on the dark matter halo. Finally, we will discuss how our cluster detection methods and our understanding of the systematics of cluster observables must improve to fully utilize impending missions that are about to substantially increase the number of known clusters (e.g. LSST, Euclid, eRosita and SPT-3G) and provide unprecedented detail on the ICM structure (e.g. Astro-H).

Confirmed speakers:
Adam Muzzin (Cambridge)
Ben Maughan (Bristol)
Ian McCarthy (LJMU)

Elizabeth Cooke, David Barnes, Paul Giles, Kshitija Kelkar
A8, A9, A10, C12. Thursday 9am, 1:30pm & 4:30pm, Friday 1:30pm