Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9555k&link_type=abstract
HST Proposal ID #9555
Physics
Hst Proposal Id #9555 Galaxies
Scientific paper
For over twenty years, distant galaxy clusters have been a key arena for galaxy evolution studies. Despite many major discoveries, the physical mechanisms that drive cluster galaxy evolution remain a mystery and largely untested. Viable proposed processes include merging, ``harassment'', starbursts, ram-pressure stripping, and infall of groups, all of which involve disks and gas, and are expected to change the mass-to-light ratios of cluster galaxies. While recent studies have concentrated on bulge-dominated galaxies, we will instead focus on the evolution of disks in distant clusters. As an initial foray into this new area, we propose an intensive study of distant disks combining archival WFPC2 data of cluster Cl0024+16 with existing high-quality Keck spectra for 145 galaxies. A unique dimension of our Keck data is its spectral resolution, which is high enough to yield internal kinematics via velocity widths and rotation curves. HST data is essential to convert the raw kinematic measures into reliable velocities, and to convert these into masses. This will be the first study of distant cluster disks and their masses and will thus serve as a powerful discriminant among plausible physical mechanisms that drive cluster galaxy evolution.
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