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VLBI Observations of the Gravitational-Lens Images of Q0957+561

Published online by Cambridge University Press:  04 August 2017

M. V. Gorenstein ,
I. I. Shapiro ,
N. L. Cohen ,
R. J. Bonometti ,
E. E. Falco ,
A. E. E. Rogers  and
J. M. Marcaide
M. V. Gorenstein
Affiliation:
Harvard-Smithsonian Center for Astrophysics
I. I. Shapiro
Affiliation:
Harvard-Smithsonian Center for Astrophysics
N. L. Cohen
Affiliation:
Cornell University
R. J. Bonometti
Affiliation:
Massachusetts Institute of Technology
E. E. Falco
Affiliation:
Massachusetts Institute of Technology
A. E. E. Rogers
Affiliation:
Haystack Observatory
J. M. Marcaide
Affiliation:
Max-Planck-Institut fur Radioastronomie

Extract

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We have conducted a series of VLBI observations of the gravitational-lens images of the quasar Q0957+561 (Walsh et al., 1979), utilizing the Mark III VLBI data acquisition system (Rogers et al., 1983). The goals of our observations are to (1) map the milliarcsecond structure of the A and B images, (2) detect the predicted third image of the quasar, and (3) determine the time delay between the images. We will use these results to constrain the mass distribution of the lens and, possibly, cosmological constants.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 110: VLBI and Compact Radio Sources , 1984 , pp. 243 - 246
Copyright
Copyright © Reidel 1984 

References

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