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For refcode 1995MNRAS.273.1069T:
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Copyright by Royal Astronomical Society. 1995MNRAS.273.1069T Quasar-galaxy associations P. A. Thomas, R. L. Webster and M. J. Drinkwater Astronomy Centre, MAPS, University of Sussex, Brighton. BNl 9QH School of Physics, University of Melbourne, Parkville, Victoria 3052. Australia Anglo-Australian Observatory, Coonabarabran, NSW 2357. Australia Accepted 1994 November 17. Received 1994 November 17; in original form 1994 April 15 ABSTRACT There is controversy about the measurement of statistical associations between bright quasars and faint, presumably foreground galaxies. We look at the distribution of galaxies around an unbiased sample of 64 bright, moderate-redshift quasars using a new statistic based on the separation of the quasar and its nearest-neighbour galaxy. We find a significant excess of close neighbours at separations less than about 10 arcsec which we attribute to the magnification by gravitational lensing of quasars which would otherwise be too faint to be included in our sample. About one quarter to one third of the quasars are so affected, although the allowed error in this fraction is large. Key words: methods: statistical - quasars: general - gravitational lensing.
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