Abstract
Only 10% - 15% of baryons in the Universe are accounted by stars, while the other 85% - 90% are distributed outside of galaxies. In order to better explain galaxy formation, we need to understand the properties of baryons not locked into stars and the reasons why they were not. In this talk, I will discuss the properties of the hot diffuse gas in galaxy groups that accounts for the bulk of baryons in these systems. Their properties reveal important information on the formation of galaxies and their central super-massive black holes. The underlying baryon physics needs to be understood to better calibrate the systematics in using X-ray clusters for precision cosmology.
Coffee and tea will be served 20 minutes prior to the seminar