Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6773r&link_type=abstract
HST Proposal ID #6773
Physics
Hst Proposal Id #6773 Galaxies &Amp, Clusters
Scientific paper
Recently we discovered a surprisingly large number of current starburst {SB} and post-starburst {PSB} early-type galaxies in three nearby clusters of galaxies, including the Coma cluster. The spectroscopic characteristics of these SB/PSB galaxies are remarkably similar to those found for the unusual galaxies in distant clusters. Thus we appear to be witnessing activity that is very similar in nature to the Butcher-Oemler {B-O} effect, but in clusters that are more than ten times nearer than the B-O clusters at z 0.3-0.5. The proximity of the clusters we are studying provides a unique opportunity to solve the principal questions concerning the origin of the B-O effect, such as what actually triggers the major star formation episodes in B-O cluster galaxies. In particular, we propose to acquire WFPC2 images of seven SB/PSB galaxies in the Coma cluster and in DC2048-52 to obtain high-resolution information on the central regions of these galaxies, where the star formation activity has been the most intense.
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