Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6825s&link_type=abstract
HST Proposal ID #6825
Computer Science
Hst Proposal Id #6825 Cosmology
Scientific paper
The goal of this proposal is to understand the differential evolution of cluster and field galaxies over the redshift range 0.3< z< 0.6. The CNOC cluster survey contains 2600 galaxies with velocities, covers the redshift range 0.17 < z < 0.55, and {uniquely} samples from the cluster core to the low- density outer regions and into the field. This dataset displays four dramatic effects: 1} evolution of the characteristic magnitude of the luminosity function, 2} an increase with z of the dispersion in color among the luminous red galaxies, 3} a strong radial gradient in galaxy population {the ``morphology-density relation''} and 4} a rapid increase with z of the fraction of blue cluster galaxies {the ``Butcher-Oemler'' effect}. Using HST imaging in two colors, we will test specific color/surface-brightness predictions of a disk- fading model, where most of the early-type cluster population is built up of infalling field galaxies over 10 Gyr, with star formation truncated during accretion. These data will also strongly constrain starburst and merging models. An understanding of field/cluster evolution will also address the systematic uncertainty in estimating Omega_degrees from the virial mass of rich clusters. The CNOC survey finds Omega_degrees=0.2+/-0.04, with a systematic uncertainty of 50% currently attributable galaxy evolution uncertainties. We will use two-color disk/bulge decomposition techniques {already applied successfully to high-redshift galaxies} which provide measurements precise enough to produce decisive tests of our proposed model.
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