Dark Matter in the Core of the Relaxed Cluster A2589

Physics

Scientific paper

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Chandra Proposal Id #07800452

Scientific paper

The centers of dark matter halos provide a unique venue for elucidating fundamental characteristics of the dark matter particles and the role that baryons play in shaping the dark matter profile. A2589 is an ideal target for X-ray studies of its DM because it is bright, nearby, and has an exceptionally smooth relaxed X-ray morphology down to its center as revealed by the 8.7 ks AO3 Chandra image. We propose a deep (80 ks) ACIS-S exposure to determine accurately the radial density profile of DM down to 0.005 r_vir. Since clusters with highly relaxed cores are so rare, the high-quality Chandra observation of the core dark matter profile of A2589 we propose will provide a critical benchmark for models of structure formation on cluster scales.

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