Mathematics – Logic
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10200j&link_type=abstract
HST Proposal ID #10200
Mathematics
Logic
Hst Proposal Id #10200 Cosmology
Scientific paper
We propose five orbits of ACS Wide Field Camera observations {three orbits with F814W, one with F606W, and one with F435W} to investigate the unique, high velocity merging cluster 1E0657-56{z=0.296}. Coupling the ACS images with deep Chandra observations and ground-based imaging will allow us to compare maps of the intracluster medium, the dark matter, and the galaxies from which we can directly estimate the self-interaction cross-section of dark matter, the dominant mass component in clusters and the Universe. These observations, combined with hydrodynamic simulations, will either rule out the range of cross-sections proposed to alleviate problems with collisionless dark matter or unambiguously detect and measure the self-interaction cross-section. A secondary objective is to quantify the impact of a supersonic merger on star formation and the morphological evolution of cluster galaxies. The geometry of 1E0657-56 {with the merger nearly in the plane of the sky} coupled with the subcluster velocity {4500 km/s} accurately constrains the timescale of the merger. In particular since the subcluster traversed the dense core of the main cluster only 0.15 Gyr ago, star formation induced by the core passage will be clearly visible.
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