Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7887f&link_type=abstract
HST Proposal ID #7887
Mathematics
Logic
Hst Proposal Id #7887 Clusters Of Galaxies And Cosmology
Scientific paper
We propose to extend our IR survey of gravitational lenses and gravitational lens candidates by obtaining NICMOS images of 14 additional lens systems or candidates {11 small-separation, 3 large-separation} and of the 4 wide-separation lens candidates that we excluded from our ongoing ``CfA-Arizona Space Telescope Lens Survey'' {CASTLES, GO-7495}. As with GO-7495, we plan to waive any proprietary period for our data. Our goals are: to confirm cases of lensing, for example by discovering lens galaxies that have previously escaped detection; to produce accurate models, particularly of lenses suitable for determining H_0 from time delays; to estimate photometric redshifts for lens galaxies lacking spectroscopic redshifts; to measure the mass-to-light ratio and its evolution for the lens galaxies out to z 1; to compare the dark and luminous matter distributions of the lenses; to probe the interstellar medium in distant galaxies using differential extinction between the lensed images; and, to use the lens redshift distribution and optical properties to constrain the cosmological model. The extended CASTLES will potentially quadruple the current sample size of lens candidates that are useful for cosmology and for studies of galaxy evolution. By including wide-separation lenses, we will also circumvent the biases of small-separation lenses against lensing by very massive galaxies, groups, or clusters of galaxies.
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