Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7279o&link_type=abstract
HST Proposal ID #7279
Mathematics
Logic
Hst Proposal Id #7279 Clusters Of Galaxies
Scientific paper
We propose to image three regions of the Butcher-Oemler {BO} cluster, A2125 {z=0.247}, to better understand the BO effect. VLA data show that, as well as a large blue-galaxy fraction {0.19} for its redshift, it has an unprecedented number of radio galaxies {30 with confirmed redshifts}, evenly split between old stellar populations and starbursting galaxies. There is also optical and X-ray evidence that a cluster- cluster merger is underway. A prominent radial ``filament'' is rich in both blue galaxies and radio sources. This combination, of unusually low redshift and radio activity suggesting that we are seeing a BO ``event'' soon after the fact, makes this cluster especially attractive in trying to distinguish various physical mechanisms at work in producing blue galaxies in rich clusters, and in tracing the links between events on cluster scales with the response within individual galaxies. We propose to image the core and filament regions of the cluster in WFPC2 filters F450W and F675W {1} to look for color and morphological evidence of the dominant mechanism among the competing theories for the BO effect and {2} to understand the origin of the enhanced radio activity. Enhancement of AGN in the substructure region would suggest that the environment is affecting the galaxy on very small nuclear scales. For star-forming galaxies, the color distribution can discriminate among several proposed mechanisms for producing a blue excess during cluster mergers.
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