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VLBI Observations of the 0957+561 Gravitational Lens System

Published online by Cambridge University Press:  03 August 2017

M. V. Gorenstein ,
R. J. Bonometti ,
N. L. Cohen ,
E. E. Falco ,
I. I. Shapiro ,
N. Bartel ,
A.E.E. Rogers ,
J. M. Marcaide  and
T. A. Clark
M. V. Gorenstein
Affiliation:
CfA
R. J. Bonometti
Affiliation:
MIT
N. L. Cohen
Affiliation:
Cornell
E. E. Falco
Affiliation:
CfA
I. I. Shapiro
Affiliation:
CfA
N. Bartel
Affiliation:
CfA
A.E.E. Rogers
Affiliation:
Haystack
J. M. Marcaide
Affiliation:
IAA
T. A. Clark
Affiliation:
GSFC

Abstract

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A series of VLBI observations of the gravitational lens system 0957+561 at λ13 cm has yielded the positions of the A and B images, the relative magnification of their largest discernible radio structures, and the time variability of their smallest discernible radio structures. These observations have also allowed upper limits to be placed on the flux density of an expected third image. The positions and relative magnification of the A and B images provide new information with which to constrain models of the lens that forms the images. The detection of variations in the flux densities of the cores of A and B suggests that observations at shorter wavelengths may reveal superluminal motion, which may in turn provide a means to measure the relative time delay.

Type
Extragalactic
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 201 - 206
Copyright
Copyright © Reidel 1988 

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