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Identifying Optical Einstein Rings

Published online by Cambridge University Press:  25 May 2016

S. J. Warren,
P. C. Hewett,
G. F. Lewis,
P. Møller,
A. Iovino and
P. A. Shaver
S. J. Warren
Affiliation:
Imperial College of Science Technology and Medicine, Prince Consort Rd, London SW7 2BZ, United Kingdom
P. C. Hewett
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom
G. F. Lewis
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom
P. Møller
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD 21218, USA
A. Iovino
Affiliation:
Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy
P. A. Shaver
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany

Extract

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The discovery of gravitationally lensed radio-rings (Hewitt et al. 1988) opened up a new line of attack on the problem of dark matter in galaxies. High–resolution radio observations (Langston et al. 1989) resolve structure tangentially and radially within the rings, providing sophisticated analysis routines (Kochanek & Narayan 1992, Wallington, Narayan & Kochanek 1994) with enough constraints to compute realistic models of the mass distribution within the deflectors (Kochanek 1995). Five such systems are now known and extensive programs to identify further examples are underway.

Information

Type
Chapter 9: Observational Developments
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996, pp. 329 - 334
Copyright
Copyright © Kluwer 1996 

References

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