Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5798i&link_type=abstract
HST Proposal ID #5798
Physics
Hst Proposal Id #5798 Galaxies &Amp, Clusters
Scientific paper
We propose to utilize HST data for quantitative studies that will allow a very rigorous examination to be made of the evolutionary state of galaxies in intermediate redshift clusters. The Fundamental Plane {FP} of early-type galaxies is one of the most sensitive tests for galaxy evolution. This is because of its low intrinsic scatter for nearby cluster galaxies. It can be used to accurately measure the luminosity evolution of galaxies, and the change of M/L with time. We have started a program to determine internal velocity dispersions of galaxies in six rich, X-ray selected clusters at redshifts between 0.3-0.6 with the Keck telescope. This project is part of the thesis for graduate student, Dan Kelson. We propose here to use the high resolution HST data from the archive on two X-ray clusters at z=0.31 and z=0.38 to determine very accurate scale lengths, surface brightnesses and morphologies. These results will be combined with Keck spectroscopic data for an FP analysis. The first Keck data on CL2137-23 is already in hand, and A370 is to be studied in an already-allocated run in November. Both A370 and CL2137-23 are gravitational lensing clusters and have a rich entourage of arclets. While the galaxies are our highest priority, we plan to use unassigned slitlets in the Keck slitmasks to determine redshifts and spectral characteristics of the arclets.
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