Bright Quasar Close Lensing Search

Details Bright Quasar Close Lensing Search Bright Quasar Close Lensing Search

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8202g&link_type=abstract

HST Proposal ID #8202

Mathematics

Logic

Hst Proposal Id #8202 Clusters Of Galaxies And Lensing

Scientific paper

We propose a second generation snapshot survey of bright quasars, optimized to find lenses with component image separations < 1". Most models of the lens components predict distributions which peak at separations in the range 0arcs5 to 1", yet the observed distribution of lenses peaks at 1arcs3. The lack of observed systems with close separations is difficult to reconcile with a geometrically flat universe, preferred by theory {inflation} and the observational determinations of the cosmological constant from type Ia supernovae. The survey will improve over the earlier pre- refurbishment snapshot survey of quasars {Bahcall et al. 1992; Maoz et al. 1993} in two important respects. With the restored PSF, new images will be considerably more sensitive to the presence of both close separation and faint lens components, and because STIS reaches 2 magnitudes fainter the PC, the new snapshot images will have much greater dynamic range.

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