Unveiling the physics at play in cluster outskirts

Through the intensive observation of the cluster of galaxy A1413, we propose togain the first precise observational description of the outskirts of a galaxycluster. Precise measurements of the density, the temperature, the mass and theentropy will allow us to investigate the physics at play in these externalregions. We aim to provide the first Xray observational constraints on thelimit of virialization and thermalization of clusters, on the feedback due togalaxy formation, on the dynamical and thermodynamical states of the accretedmaterial from the cosmic web. We will confront this work with up to datepredictions from numerical simulations in the framework of the formation and theevolution of largescale structure. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]