Quantitative Morphology of Early-Type Galaxies in Cl0024+16

Details Quantitative Morphology of Early-Type Galaxies in Cl0024+16 Quantitative Morphology of Early-Type Galaxies in Cl0024+16

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5802k&link_type=abstract

HST Proposal ID #5802

Physics

Hst Proposal Id #5802 Galaxies &Amp, Clusters

Scientific paper

We propose to measure sizes and surface brightnesses of early- type galaxies from Cycle 4 WFPC-2 exposures of the very rich galaxy cluster Cl0024+16 {z=0.39}. These images are part of a program by Turner et al. to investigate the system of giant gravitational arclets in this field. They also contain valuable information on galaxy morphology which we intend to exploit. As demonstrated by our WF/PC-1 work on a z=0.55 galaxy cluster, even pre-refurbishment HST images contain valuable photometric information on galaxy shape and structure. We have developed new software to extract a variety of quantitative measures of galaxy shapes and surface brightnesses. Three nights on the new Keck 10-m telescope have been allocated to us to obtain velocity dispersions and new redshifts for galaxies in this cluster. Coupled with the HST archive images, these data will provide the first look at early-type galaxy scaling relations for redshifts above z 0.2, and thus yield potent new probes of both galaxy evolution and cosmology.

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