HRCAM SURVEY FOR CLOSELY SPACED GRAVITATIONAL LENSES

The CFHT image stabilizing camera HRCam was used to search for closely spaced images indicative of gravitational lensing among a sample of 101 apparently and intrinsically luminous quasars. No conclusive evidence of multiple imaging due to lensing was found. Although these results are in accord with recent predictions based on standard models of the universe, Turner points out that model universes dominated by a nonzero cosmological constant are not favored. No significant excess of galaxies near the quasars was found, in contrast to the results of Webster et al. and, more recently, by Drinkwater, Webster, & Thomas.