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Title:
Gravitational Lenses with more than Four Images. I. Classification of Caustics
Authors:
Keeton, Charles R.; Mao, Shude; Witt, Hans J.
Affiliation:
AA(Steward Observatory, University of Arizona, Tucson, AZ 85721; ), AB(University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, United Kingdom.; Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching, Germany), AC(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany)
Publication:
The Astrophysical Journal, Volume 537, Issue 2, pp. 697-707. (ApJ Homepage)
Publication Date:
07/2000
Origin:
UCP
ApJ Keywords:
Cosmology: Distance Scale, Cosmology: Gravitational Lensing
DOI:
10.1086/309087
Bibliographic Code:
2000ApJ...537..697K

Abstract

We study the problem of gravitational lensing by an isothermal elliptical density galaxy in the presence of a tidal perturbation. When the perturbation is fairly strong and oriented near the galaxy's minor axis, the lens can produce image configurations with six or even eight highly magnified images lying approximately on a circle. We classify the caustic structures in the model and identify the range of models that can produce such lenses. Sextuple and octuple lenses are likely to be rare because they require special lens configurations, but a full calculation of the likelihood will have to include both the existence of lenses with multiple-lens galaxies and the strong magnification bias that affects sextuple and octuple lenses. At optical wavelengths, these lenses would probably appear as partial or complete Einstein rings, but at radio wavelengths, the individual images could probably be resolved.
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