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Gravitational Lenses

Published online by Cambridge University Press:  03 August 2017

Bernard F. Burke
Bernard F. Burke*
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA

Abstract

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The gravitational lensing phenomenon is a new observational tool in cosmology. It appears to occur reasonably frequently; several thousand examples probably are observable with current radio and optical telescopes. A dozen or so reasonable candidates have been proposed, but it has become clear that one must apply strong tests to distinguish between real examples of lensing and chance associations. The dramatic double quasar 1146+111 has emphasized the need to be rigorous, and data is presented that casts further doubt on its status as a lens. There are a number of well-established cases, however, and these illustrate the varied character of possible lenses. Present observational programs should enlarge the number of established examples. Time-delay measurements are also in progress that give a new class of cosmological test; the original lensed quasar pair 0957+561 seems to have a differential time delay provisionally estimated at 600 ± 200 days for the two principal images.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 130: Large Scale Structures of the Universe , 1988 , pp. 447 - 462
Copyright
Copyright © Reidel 1988 

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