WFPC2 observations of potential JVAS/CLASS gravitational lenses

Details WFPC2 observations of potential JVAS/CLASS gravitational lenses WFPC2 observations of potential JVAS/CLASS gravitational lenses

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8248w&link_type=abstract

HST Proposal ID #8248

Computer Science

Hst Proposal Id #8248 Clusters Of Galaxies And Lensing

Scientific paper

The JVAS/CLASS gravitational lens surveys have been the most successful so far at finding new arcsecond-scale gravitational lenses. A total of 17 confirmed systems have been discovered. One surprising result is the number of doubly-imaged lensed systems compared to ``quad'' configurations. The doubles are under-represented in the current JVAS/CLASS lens sample by a factor 5 based on conventional models of the lensing galaxies. This may be partly due to an observational selection bias that favours the discovery of quad lens sytems over doubles. It is essential to ensure that no doubly-imaged lensed systems are missed. Previous WFPC2 observations of candidate lens systems have proved remarkably successful at confirming new lensed systems by the detection of lensed images and the lensing galaxies. Recent Cycle 7 NICMOS observations of JVAS/CLASS candidate systems discovered three new lens systems. However, several ambiguous candidates from the first two phases of the CLASS survey remain and two very strong new candidates from the recently observed final phase of CLASS have also been uncovered. Based on the observed lensing rate in JVAS/CLASS {1:500} we expect that the majority of these candidates will turn out to be lenses. There is a companion proposal to this one which aims to examine confirmed cases of gravitational lensing in the JVAS/CLASS surveys in more detail.

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