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Multi-Frequency VLBI Observations Of B0218+357

Published online by Cambridge University Press:  25 May 2016

Richard W. Porcas  and
Alok R. Patnaik
Richard W. Porcas
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D–53121 Bonn, Germany
Alok R. Patnaik
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D–53121 Bonn, Germany

Abstract

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We present the results from VLBI observations at three frequencies of the gravitational lens system B0218+357. From the source double structure, seen in both the A and B images at 15 GHz, we have derived a relative magnification matrix, and we show that the lens mass distribution must be non-spherical. We investigate how far the matrix parameters derived from 15 GHz observations can be used to relate the A and B images at 1.7 and 5 GHz, where the image sizes are much larger.

Type
Chapter 9: Observational Developments
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 311 - 316
Copyright
Copyright © Kluwer 1996 

References

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