Proceedings of the Hamburg conference on ’Gravitational Lenses’, Lecture Notes in Physics 406
Lecture Notes in Physics, volume 406
Hamburg conference on ’Gravitational Lenses’
9-13 September 1991
[en] GRAVITATIONAL LENSES
[en] We used scans of sky survey plates available at STScl to look for the presence of multiple-image QSOs which could be due to gravitational lensing. We extracted about 1500 fields, each having 5 arcmin in size, around QSOs brighter than m v = 18. No lenses have been found so far. We found several cases of galaxies close in projection (within a few arcsec) from QSOs.