VLBI observations of the gravitational-lens images of Q0957 + 561
Abstract
A series of VLBI observations of the gravitational-lens images of the quasar Q0957 + 561 (Walsh et al., 1979) has been conducted utilizing the Mark III VLBI data acquisition system (Rogers et al., 1983). The goals of these 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. These results will be used to constrain the mass distribution of the lens and, possibly, cosmological constants.
- Publication:
-
Liege International Astrophysical Colloquia
- Pub Date:
- June 1983
- Bibcode:
- 1983LIACo..24..178G
- Keywords:
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- Gravitational Lenses;
- Quasars;
- Very Long Base Interferometry;
- Time Lag;
- Astrophysics