The Fundamental Plane of Cluster Dwarf Ellipticals

Details The Fundamental Plane of Cluster Dwarf Ellipticals The Fundamental Plane of Cluster Dwarf Ellipticals

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8750g&link_type=abstract

HST Proposal ID #8750

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Hst Proposal Id #8750 Galaxies

Scientific paper

We propose to use archival WFPC2 images to measure the structural parameters {i.e., luminosity profile, half-light radius, surface brightness, and concentration indices} of dwarf ellipticals {dEs} in the Coma cluster. This proposal is part of a comprehensive program to study the scaling laws of cluster dEs. These empirical correlations provide key constrains to models of galaxy fomation and evolution. Compared to other studies of cluster dEs, this program is unique in that it includes measurements of the internal kinematics {i.e., velocity dispersions}. Colors, magnitudes, redshifts, line strengths and velocity dispersions for 80 dEs in the central 24'*18' region of Coma have already been measured from deep UBR images and multiobject spectroscopy using WIYN. In addition to these data, structural parameters are essential to explore fundamental plane-type correlations. Given the small size of faint dEs { 0.4'' at Coma}, high spatial resolution images are required to measure their structural parameters. There are 61 archival WFPC2 pointings {mostly in F606W filter} which provide good signal-to-noise images of 21 dEs in our sample. This combined WIYN/HST data set will allow the first determination of the fundamental plane of cluster dEs, and aims to be a milestone for testing current theories on the formation and evolution of dwarf galaxies in clusters.

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