Multiple imaging of quasars by galaxies and clusters

Details Multiple imaging of quasars by galaxies and clusters Multiple imaging of quasars by galaxies and clusters

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..112n&link_type=abstract

Nature (ISSN 0028-0836), vol. 310, July 12, 1984, p. 112-115. Research supported by the Alfred P. Sloan Foundation and Princeton

Physics

61

Galactic Clusters, Galaxies, Gravitational Lenses, Quasars, Red Shift, Amplification, Very Long Base Interferometry

Scientific paper

It is suggested that amplification bias is as likely to be important in gravitational lensing by clusters as it is in lensing by galaxies, so that quasars are as likely to be multiply imaged by clusters as by galaxies. Also due to amplification bias, image separations of a few arcsec are highly probable in cluster lensing despite the large angular size of cluster cores. Although Q 0957 + 561 is a convincing example of cluster-assisted galaxy imaging, Q 1115 + 080, Q 2345 + 007, Q 2016 + 112, and Q 1635 + 267 are equally interpretable in these terms.

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