Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6560w&link_type=abstract
HST Proposal ID #6560
Physics
Hst Proposal Id #6560 Cosmology
Scientific paper
Observations of gravitationally lensed Einstein-ring images provide a dramatic improvement in our ability to constrain the properties of lensing mass distributions and the structure in the extended sources. The rings are so effective, relative to the more common multiply-imaged point sources, because of the constraints provided by the two-dimensional surface brightness maps obtained from high-resolution imaging. The first five known rings were discovered in radio surveys and are all very faint optically. The first optically bright ring, recently discovered spectroscopically and confirmed by imaging, is clearly a prime target for HST imaging. Here we propose a WFPC2 image through the F555W filter to provide a resolved surface-brightness map of the ring and the lensing galaxy. The lens is an early-type galaxy at z=0.485, and the source is an emission-line galaxy at z=3.591. The goal of these observations is twofold: a} to measure the radial profile of the mass-to-light ratio of the lensing galaxy, and b} to determine the structure of the background high-redshift galaxy, at a resolution of 0.2 arcsec.
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