Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8762d&link_type=abstract
HST Proposal ID #8762
Mathematics
Logic
Hst Proposal Id #8762 Cosmology
Scientific paper
The process of assembling of galaxies into rich clusters may leave distinctive signatures in the stellar populations and morphological mix that depend on position in the cluster, and evolve with redshift. We propose to study the properties of galaxies in the core and halo of the galaxy cluster A1689 at z = 0.18 using a combination of HST optical, emphmosaic imaging {archival}, ground-based optical and IR imaging {already obtained}, and Keck medium resolution spectroscopy. This study will alleviate systematic uncertainties in the very local studies of the cluster galaxy population {in Coma} and form a bridge to the results from intermediate- to high-z systems. As a function of local galaxy density within each cluster, we will study the projections of the Fundamental Plane correlations {the optical-infrared color-magnitude relation and the radius-luminosity relation}, the IR luminosity function, and the changing morphological mix. Keck spectroscopy will play a vital role in efficiently determining velocities and rotation curves for cluster members. The images will also be searched for extremely-red galaxies--which could represent high-redshift elliptical {z 1} or star-forming {z > 4} galaxies lensed by the rich clusters. emphThis study is unique in that both the ground-based IR imaging and the HST optical imaging mosaic a wide-field, thereby allowing for the simultaneous study of galaxies in the core and the halo of the cluster.
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