The Bullet Cluster Reloaded? An in-depth study of two post-collision cluster mergers

Details The Bullet Cluster Reloaded? An in-depth study of two post-collision cluster mergers The Bullet Cluster Reloaded? An in-depth study of two post-collision cluster mergers

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12362e&link_type=abstract

HST Proposal ID #12362. Cycle 18

Physics

Scientific paper

Detailed X-ray/lensing studies of the massive X-ray selected galaxy clusters 1E0657-56 {the "Bullet Cluster"} and MACSJ0025.4-1222 have exploited the segregation of collisional and collisionless matter in cluster mergers to obtain first constraints on the self-interaction cross section of dark matter. We here propose a similar study of two newly discovered very X-ray luminous galaxy clusters from the MACS sample that have been confirmed as linear, post-collision mergers of similar or higher mass. The proposed ACIS-I and HST/ACS observations will allow an accurate mapping of collisional {X-ray gas} and collisionless matter {galaxies and, presumably, dark matter} and thus yield improved constraints on the properties of dark matter.;

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