Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5979r&link_type=abstract
HST Proposal ID #5979
Other
Hst Proposal Id #5979 Quasars
Scientific paper
We propose to use HST with WFPC2 in order to carry out deep imaging of the lensing cluster of the double quasar Q0957+561. This will significantly improve the estimate we have made of the Hubble constant using this double quasar. We will determine the gravitational potential of the cluster in which the lensing galaxy is located. The most accurate way to do this is to take very deep images of the cluster and measure the gravitational lens distortion of the blue background galaxy population. The confirmation of distortions in the lensed background galaxies inferred from ground-based observations at CFHT and KPNO, particularly in several small blue galaxies seen near the QSO and one apparent arc, will allow us to produce a high quality map of the cluster mass distribution, thereby reducing the largest unknown in the determination of H_0 via the gravitational lens time delay method. In addition, there is a possibility that WFPC2 images may reveal the presence of giant thin arcs, particularly if the mass falls off faster than isothermal. These thin arcs if observed would provide an additional strong constraint on the mass distribution models. We wish to emphasize that measuring the Hubble constant in this manner is complementary to the standard distance ladder methods.
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