The most powerful gravitational lens

Details The most powerful gravitational lens The most powerful gravitational lens

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7342s&link_type=abstract

HST Proposal ID #7342

Physics

Hst Proposal Id #7342 Clusters Of Galaxies

Scientific paper

We have recently detected a cosmic microwave background decrement towards the quasar pair PC1643+4631 A, B {z =3.79, 3.83, separation 198"}. Following deep ground-based observations of this field, we have determined the decrement is likely to be a Sunyaev-Zel'dovich {S-Z} fluctuation caused by a cluster with mass > 10^15 M_SUN at a redshift z > 1. This is the first high-redshift structure to be detected by observations of the microwave background. Given the presence of such a massive structure at a large redshift along this BOX of sight, the images of the quasar pair must be gravitationally lensed to some degree. It is very probable that these are in fact two images of the same quasar, making this system the most powerful gravitational lens known. We seek to observe the vicinity of the quasars with WFPC2 to detect evidence for lensing. This information will allow us to constrain the mass of the S-Z-producing cluster which in turn will allow the first insight into massive clusters at z > 1.

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