Abstract
view Abstract Citations (2) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS AN Automated Search for Widely Spaced Gravitational Lenses Performed on 25 Grens Plates Beauchemin, M. ; Borra, E. F. Abstract An automated search for gravitational lenses has been conducted on 25 grens plates taken from the automated CFHT-Laval survey. We surveyed a total of 39966 objects on 15.7 sq deg to B~21. The plates have excellent image quality with FWHM ~ 1". All close pairs (1.5" < separation < 10"), irrespective of image extendedness, having similar colors and possessing characteristics of quasars have been extracted from our existing databases. Between 600 and 1200 bona fide quasars should have been examined. Positions, magnitudes, and spectra] characteristics of the 11 lens candidates found are furnished. A noteworthy aspect of the Laval survey is the capacity to quantify the selection effects in finding specific classes of objects; we give, therefore, the basic information necessary for modeling the selection effects of our survey. We estimate that ~15% of the primaries are quasars, yielding to a probable value of 0.02%-0.04% lensed quasars with separations between 1.5"-10", consistent with the recent predictions of Fukugita & Turner [MNRAS, in press (1991)]. Publication: The Astronomical Journal Pub Date: February 1992 DOI: 10.1086/116069 Bibcode: 1992AJ....103..405B Keywords: Astronomical Photography; Gravitational Lenses; Sky Surveys (Astronomy); Quasars; Red Shift; Spatial Distribution; Visible Spectrum; Astrophysics; GRAVITATIONAL LENSING full text sources ADS | data products SIMBAD (32) NED (32)
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