Gravitational Lensing Studies with Hst: Dark Matter and High Redshift Galaxies -- CYCLE4 High

Details Gravitational Lensing Studies with Hst: Dark Matter and High Redshift Galaxies -- CYCLE4 High Gravitational Lensing Studies with Hst: Dark Matter and High Redshift Galaxies -- CYCLE4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5352f&link_type=abstract

HST Proposal ID #5352

Physics

Hst Proposal Id #5352 Galaxies &Amp, Clusters Clusters/Lenses

Scientific paper

We propose deep multicolour WFC2 imaging of a sample of gravitationally-lensed `giant arcs' for which extensive ground-based data has already been secured. High resolution studies of these systems offer an unique probe of the dark matter distribution in the lensing clusters as well as of the nature of background field galaxies at redshifts above one. By resolving the arcs and their counter-images with HST, mass models that account for the lensing are much more highly constrained. This, in turn, will lead to an improved knowledge of the structure of the distant sources. Ground-based photometry indicates most arcs are intensely blue star-forming systems. Morphologies will provide important information on the ancestors of normal galaxies. Extrapolating the trends found in recent ground-based data, we also expect to identify many close image pairs in deep HST images. These pairs are probably highly magnified images of B=28-30 galaxies. The abundance of pairs will place a new constraint on the galaxy count turnover and hence the epoch of galaxy formation. Our program is uniquely suited to WFC2 and builds on a wealth of existing deep ground-based optical/infrared data.

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