Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..405b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 405-412. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
2
Astronomical Photography, Gravitational Lenses, Sky Surveys (Astronomy), Quasars, Red Shift, Spatial Distribution, Visible Spectrum
Scientific paper
An automated search for gravitational lenses has been conducted on 25 grens plates taken from the automated CFHT-Laval survey. A total of 39,966 objects was surveyed on 15.7 sq deg to B of about 21. The plates have excellent image quality. All close pairs, irrespective of image extendedness, having similar colors and possessing characteristics of quasars have been extracted from existing databases. Between 600 and 1200 bona fide quasars should have been examined. Positions, magnitudes, and spectral 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; the basic information necessary for modeling the selection effects of this survey is accordingly given. About 15 percent of the primaries are quasars, yielding a probable value of 0.02-0.04 percent lensed quasars with separations between 1.5-10 arcsec.
Beauchemin Mario
Borra Ermanno F.
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