Early-type galaxies in a cluster at z=2

Veronica Strazzullo (CEA Saclay)

Cl J1449+0856 at z=2 is the most distant galaxy cluster for which an extended X-ray emission has been detected. A likely representative progenitor of today's typical massive clusters, it allows the study of galaxy populations in most dense environments 10 billion years ago, a crucial time bridging proto-clusters to the first established clusters, and marking the main formation epoch of massive cluster early-type galaxies. In the core of this system, a remarkably diverse galaxy population clearly shows how galaxy evolution is in a much more active phase as compared to cluster cores at z

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