Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6543l&link_type=abstract
HST Proposal ID #6543
Other
Hst Proposal Id #6543 Cosmology
Scientific paper
We propose to obtain images of the gravitational lens system 2016+112 in two broad filters and a narrow ramp filter centered on the strong, narrow Ly Alpha line of the z=3.265 multiply imaged quasar {5182 Angstrom, which by a happy coincidence can be placed on the PC with a 15degrees rotation}. These observations will provide: 1} an accurate position of the faint third image relative to the others {not possible in radio images alone because of confusion with one of the lensing galaxies}; 2} detections of or improved limits on additional images near the second lensing galaxy; 3} ellipticities and position angles for the two lensing galaxies; 4} evidence of any distortions in the quasar emission line regions on scales of less than 1 kpc; and, possibly, 5} a test of the existence of a cluster of galaxies at z 1 suggested by recent X-ray measurements; and 6} the structure of the resolved emission line regions located near the quasar. 2016+112 is the only known system with two supercritical lenses at different redshifts. Such systems may be quite sensitive to Omega_0. The proposed observations will provide crucial data required for a successful model. Stong radio emission from one of the lensing galaxies makes accurate and unambiguous radio-only measurements of the faint third image impossible. Only with high resolution HST images in the Ly Alpha line can this confusion be overcome.
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