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Gravitational lenses

Published online by Cambridge University Press:  25 May 2016

J. N. Hewitt
J. N. Hewitt*
Affiliation:
Department of Physics and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge, Massachusetts 01239 USA

Abstract

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In approximately half the systems currently recognized as strongly gravitationally lensed, the background object is an extragalactic radio source. Radio observations have played an important role in the identification of lensed systems, and the properties of radio sources allow some of the astrophysical applications of lensing to be realized. High redshift galaxies can be studied through lens modeling and by observing more than one ray path through the lens. The morphological, spectral, and polarization information of high resolution radio images provides strong constraints on the mass distribution in the lensing galaxies. On cosmological scales, radio variability has been applied to the time delay measurement of angular diameter distance.

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 105 - 110
Copyright
Copyright © Kluwer 1996 

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