Physics – Optics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7332b&link_type=abstract
HST Proposal ID #7332
Physics
Optics
Hst Proposal Id #7332 Cosmology
Scientific paper
We propose to image the gravitational lens system 0957+561 at least 1 mag deeper than previous HST data in order to detect more faint lensed structures. Previous WFPC2 imaging revealed two faint galaxies which appear to be lensed images of each other, plus a faint extended arc. The deeper image will permit more accurate reconstruction of the mass distribution in the lens. Because an accurate time delay is known for this lens, a better mass model translates directly to improved accuracy in the determination of the Hubble constant. With a deeper image, we should: {1} find the counter-images to the arc; {2} observe structure in the known lensed galaxy pair, thus determining the full relative magnification matrix between them; {3} likely detect at least one other multiply- imaged background galaxy; {4} better measure the positions of the existing features. The resulting extra constraints on the lens optics will give unprecedented accuracy in our knowledge of the dark matter distribution in the lens, and sho uld allow an H_0 determination to 10-15 the STIS imager, this will only require 11 CVZ orbits.
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