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Séminaires, soutenances

# Cosmology with galaxy clusters using their imprints in the Cosmic Microwave Background

 Description Clusters of galaxies represent the last step of the formation of large scale structures in the Universe. They grow from the accretion of surrounding material and from the mergers of subclusters in the most energetic events since the Big Bang. The clusters are fundamental for cosmology and provide unique laboratories to study the co-evolution of the dark and the baryonic matter. One way to probe these objects is to measure their imprint in the Cosmic Microwave Background using the Sunyaev-Zel'dovich (SZ) effect. After introducing the key role of clusters in modern cosmology, I will discuss how the SZ effect can be used to probe the intracluster gas pressure and velocity, in order to understand how they form and to use them as a robust cosmological probe. I will then present state-of-the-art SZ observations, which were recently used, in particular, to obtain the first image of the moving gas in a merging cluster of galaxy.