Raphael Gobat - 1st Talk - The shape of intracluster gas at high redshift

Abstract: The Sunyaev-Zel'dovich effect has become a powerful tool for detecting the hot gaseous atmosphere (ICM) of galaxy clusters up to far cosmological distances. Indeed, many clusters have been found so far through their imprint on the cosmological microwave background, up to a redshift of ~2. However, high-redshift SZ surveys still tend to be limited to relatively high masses and poor resolution. Here we will present early results of z=2 SZ observations with ALMA, showing the interferometer's capability for not only accurate cluster mass determination at high redshift, but also its potential for constraining the spatial distribution of gas pressure, and thus mechanisms of energy injection into the ICM, at an epoch were they are expected to play an important role.