Extragalactic Astrophysics and CosmologyPhoto: HS/BrüggenHigh-Energy AstrophysicsWe study processes and phenomena of high-energy astrophysics in galaxy clusters.morePhoto: NASA, ESAObservational AstronomyWe study galaxy evolution and cosmology.morePhoto: HS/de GasperinRadio AstronomyWe study the structure and morphology of galaxy clusters through ground-based low frequency radio interferometry.morePhoto: HS/SelgNumerical SimulationsWe perform numerical simulations of galaxy groups and interacting galaxies.more