Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6652i&link_type=abstract
HST Proposal ID #6652
Other
Hst Proposal Id #6652 Cosmology
Scientific paper
The gravitational lens system 1422+231 offers the exciting prospect of a direct measure of the Hubble constant. This system has important advantages compared to the more well- studied double quasar {0957+561}. First, the background quasar at z = 3.62 is a strong and compact radio source which is known to be a radio variable, and for which evidence for rapid optical variations exists. Second, there are four quasar images giving a large number of model constraints from measures of image position, image magnification, and time delay. Finally, successful models show the primary deflector to be a single galaxy {shear is contributed by two other galaxies in the field}, so that the interpretation is not compromised by the unknown distribution of dark matter in a cluster potential. Cycle 4 spectroscopy with the FOS has yielded identical spectra for the four quasar components, confirming the system as a gravitational lens. Cycle 4 imaging with the FOC has yielded the first clear detection of the lensing galaxy. As a step towards the eventual measure of the Hubble constant, we propose multicolor UBVRI imaging with the Planetary Camera, with a deep exposure in the sensitive I{814W} filter. The data will yield the colors, structure and morphology of the lens and the two shearing galaxies, as well as a census of other deflectors and lensing screens along the line-of-sight to the quasar. Individual exposures from the deep I{814W} image will be used to characterize the intrinsic optical variations of the quasar.
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