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Paper: Associations between galaxies and bright quasars
Volume: 21, The Space Distribution of Quasars
Page: 317
Authors: Drinkwater, M. J.; Webster, R. L.; Thomas, P. A.
Abstract: The results of a CCD imaging survey of bright (V not greater than 17.5) quasars are presented. There is a significant overdensity of galaxies close to the lines-of-sight to these quasars. (30 +/- 8) percent of the quasars have closely associated galaxies in excess of those predicted by a random distribution. If this overdensity is due to amplification of the quasars by gravitational lensing, then, allowing for the probability that a galaxy is detected, at least 60 percent of bright quasars may be lensed.
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