Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...219...54g&link_type=abstract
Science, vol. 219, Jan. 7, 1983, p. 54-56.
Astronomy and Astrophysics
Astronomy
29
Galactic Nuclei, Gravitational Lenses, Quasars, Radio Astronomy, Very Long Base Interferometry
Scientific paper
By use of a new, very sensitive interferometric system, a faint, compact radio source has been detected near the center of the galaxy that acts as the main part of a gravitational lens. This lens forms two previously discovered images of the quasar Q0957+561, which lies in the direction of the constellation Ursa Major. The newly detected source has a core smaller than 0.002 arc second in diameter with a flux density of 0.6 + or - 0.1 millijansky at the 13-centimeter wavelength of the radio observations. This source could be the predicted third image of the transparent gravitational lens, the central core of the galaxy, or some combination of the two. It is not yet possible to choose reliably between these alternatives.
Cohen Norman L.
Corey Brian E.
Falco Emilio E.
Gorenstein M. V.
Marcaide Juan Maria
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