Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..538g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. 538-548.
Astronomy and Astrophysics
Astronomy
31
Brightness Distribution, Gravitational Fields, Quasars, Radio Sources (Astronomy), Very Long Base Interferometry, Centimeter Waves, Flux Density, Gravitational Lenses
Scientific paper
The authors detected similar compact radio structures in the A and B images of the quasar Q0957+561 from observations in 1980 February that utilized a three-element VLBI array operating at 13 cm (2292 MHz). The array included antennas at Goldstone, California, Effelsberg, Federal Republic of Germany, and Madrid, Spain. Data from the long baselines show that the A and B images contain core components with flux densities of 22±1 and 18±1 mJy, respectively. Data from the short Effelsberg-Madrid baseline suggest that additional correlated flux density, distributed over an angular scale of ≡20 mas, accompanies both cores. The observed brightness distributions of these cores are related by a linear magnification matrix, consistent with conservation of surface brightness, as expected for images produced by a transparent gravitational lens.
Bonometti R. J.
Cohen Norman L.
Corey Brian E.
Falco Emilio E.
Gorenstein M. V.
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