High resolution observations of the merging cluster Abell 3921

Physics

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Chandra Proposal Id #05800641

Scientific paper

We propose to observe Abell 3921, which belongs to a sample of merging clusters selected for observation on XMM guaranteed time (PIs J.L.Sauvageot and T.Ponman). This program is coupled to an optical follow up at ESO telescopes, as we have observed A3921 at 2.2m/WFI and 3.6m/EFOSC2. A proposal for the VLT is being submitted for new high resolution, multi-object spectroscopy. Our previous analysis of optical and XMM data indicates that in A3921 the main cluster is merging with a group. By combining the CHANDRA data with already obtained optical and XMM data and with numerical simulations, we aim at a) perfoming a detailed analysis of the dynamical state, b) fully characterizing the physics of the merging process, and, most important, c) determining its effects on the galaxies and the gas.

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