Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8705h&link_type=abstract
HST Proposal ID #8705
Mathematics
Logic
Hst Proposal Id #8705 Cosmology
Scientific paper
We propose to map the mass distribution in the vicinity of the multiple QSO system RX J0911+05 using weak gravitational lensing. This object has emerged as one of the most promising candidates for a cosmological determination of the Hubble constant using time delay measurements. There is evidence that a high-redshift cluster of galaxies {z = 0.77} acts as the source of a very large external shear {Gamma > 0.15}, affecting the lens potential. Deep WFPC2 images will allow us to directly measure this shear from the distortions of faint background galaxies. Such data are essential for producing a reliable mass model of the system which, in combination with the newly measured time delay, will provide the best constrained mass model for a multiple QSO, hence leading to an accurate cosmological estimate of the Hubble constant.
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