Mathematics – Logic
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..177k&link_type=abstract
NOAO Proposal ID #2000B-0177
Mathematics
Logic
Scientific paper
Detailed studies of poor groups of galaxies offer two sets of constraints on galaxy evolution and cosmology: (1) groups are not only common environments for galaxies, but also relative simple systems in which the range of mechanisms thought to drive galaxy evolution is much narrower than in hotter, denser clusters; and (2) group members and the diffuse dark matter of the group halo affect measurements of cosmological parameters such as H_0 and (Lambda) from gravitational lensing. Little is known about groups beyond z ~ 0.1, because traditional methods of finding rich clusters cannot identify group candidates and confirm that a candidate group is a bound system (instead of a chance superposition along the line of sight). However, the recent identification of strong gravitational lenses that require an additional an extended mass component to reproduce the multiple images suggests a new method for simultaneously identifying and confirming distant groups. We have assembled the first systematic sample of candidate distant groups from the known gravitational lenses. We propose optical imaging and spectroscopy of six of the candidate groups at redshifts between z=0.3 and 1. We will identify group members and determine their colors, morphologies, and spectral characteristics. We will compare them with existing samples of nearby groups to measure galaxy evolution. We will also greatly improve gravitational lens models by including the effects of the groups as well as any other structures along the line of sight.
Keeton Chuck
Zabludoff Ann
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