Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9528o&link_type=abstract
HST Proposal ID #9528
Physics
Hst Proposal Id #9528 Galaxies
Scientific paper
Compact groups of galaxies have been the subject of intense observational and theoretical scrutiny, because they may well play a fundamental role in galaxy evolution. These objects are the sites of rapid merger events. We propose an archival search for moderate redshift compact groups to achieve these goals: beginenumerate em Use archival WFPC2, STIS, and ACS images to collect candidate compact groups at redshifts in the range 0.5 z 1. em Apply new Fourier-based image analysis methods to identify tidally disturbed group members, thereby increasing the likelihood of identifying true physical associations. em Carry out a program of spectroscopic followup {using the upgraded MMT} to confirm the group nature of these galaxy aggregates. endenumerate There is strong evidence for an epoch-dependent merger rate, and we will use our confirmed compact groups as probes for detecting this. If the merger rate does indeed increase substantially at zcge0.5, then we expect to see a strong increase in the number of observed compact groups, the most extreme manifestations of merging.
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