Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5458f&link_type=abstract
HST Proposal ID #5458
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #5458 Galaxies &Amp, Clusters Evolution/Cosmology
Scientific paper
One of the more fundamental problems in current astronomy is that of galaxy evolution. We still do not have good constraints on how galaxy densities, types, and luminosities evolve with redshift. Most studies until now have used only photometric and spectrophotometric information to derive 'spectral' classifications and luminosities. Whereas these methods will remain essential to understanding evolution, they are insufficient for a unique interpretation of the data. I have started a ground-based program to measure dynamical parameters of galaxies in intermediate redshift clusters. I have successfully measured velocity dispersions, and in some cases, rotational velocities. These dynamical data are a fundamental step forward towards quantifying the effects of 'passive evolution', mergers, starburst, etc. The first results on galaxies in Abell 665 at z=0.18 have demonstrated the value of these data amply: one of the galaxies is an E+A galaxy, rotates rapidly, and lies far off the Faber-Jackson relation measured for other cluster galaxies. This is the first time that such detailed information has become available on such a galaxy, and it provides insight into the mechanisms which cause the rapid evolution of galaxies in rich clusters (the Butcher--Oemler effect). Here it is proposed to obtain 2 color WFPC images of this galaxy, and the other cluster galaxies. This galaxy is ideally suited because of it brightness, rather low redshift, and the detailed groundbased data.
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