Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10420e&link_type=abstract
HST Proposal ID #10420
Physics
Hst Proposal Id #10420 Cosmology
Scientific paper
We propose a deep ACS/WFC F606W+F814W mosaic of the massive cluster MACSJ0717.5+3745 at z=0.55 in order to obtain the first direct detection of cluster evolution through infall of matter along large-scale filaments. Existing optical, X-ray, and groundbased weak-lensing data show strong evidence of galaxy groups and dark matter in a coherent structure spanning at least 10 arcmin {4/h Mpc, LCDM} in the plane of the sky. The size of this object rules out prior interaction between the groups and the cluster, thus making it a prime candidate for a genuine filament as opposed to a merger remnant. The proposed observation will 1} allow the first direct measurement of the dark matter content and mass distribution along a large-scale filament via weak lensing, and 2} provide, through galaxy morphology and resolved colour information, unprecedented insights into the physical processes and environmental effects governing the transition from field to cluster galaxies.
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