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Gravitational Lensing — Models

Published online by Cambridge University Press:  19 July 2016

Ramesh Narayan
Ramesh Narayan*
Affiliation:
Steward Observatory, University of Arizona, Tucson, AZ 85721, U.S.A.

Abstract

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Qualitative features of gravitational lensing are discussed in terms of a scalar framework based on Fermat's principle. The lensing action of galaxy-like models with spherical and elliptical mass distributions are described. The elliptical model has three distinct regimes of lensing, of which two correspond to lensing with three images and one with five images. One of the three-image geometries has been frequently explored in the past. Models proposed for 0957+561 correspond to this. The five-image geometry has been invoked for 1115+080. Some general model-independent properties of gravitational lensing are listed. If image parities were available, it might be possible to make statements about the lensing mass even when it is made up of dark matter.

Type
VI. Quasars as Probes of the Intervening Medium
Information
Symposium - International Astronomical Union , Volume 119: Quasars , 1986 , pp. 529 - 538
Copyright
Copyright © Reidel 1986 

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