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Gravitational Telescopes

Published online by Cambridge University Press:  25 May 2016

R. D. Blandford  and
D. W. Hogg
R. D. Blandford
Affiliation:
Caltech, Pasadena, CA 91125, USA
D. W. Hogg
Affiliation:
Caltech, Pasadena, CA 91125, USA

Abstract

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Some ways in which gravitational lenses can act as crude telescopes are reviewed. Magnification limits associated with finite source size, corrugation of the gravitational potential and finite wavelength are specified. It should be possible to obtain rotation curves for a small sample of ultra-faint galaxies imaged as giant arcs. There is an appreciable chance of eventually observing a radio jet component cross a caustic. The successful observation of microlensing in 2237+031 suggests that the continuum emission from this source at blue wavelengths is at least partly non-thermal. The maximum possible magnification observable, granted existing constraints is argued to be from γ-ray pulsars crossing caustic sheets formed by galaxies or a hypothetical population of intergalactic massive objects.

Type
Chapter 10: Emerging Applications
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 355 - 364
Copyright
Copyright © Kluwer 1996 

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