VLBI observations of the double quasar 0957 + 561

Details VLBI observations of the double quasar 0957 + 561 VLBI observations of the double quasar 0957 + 561

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243l..57h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 15, 1981, p. L57-L59.

Astronomy and Astrophysics

Astronomy

5

Gravitational Lenses, Quasars, Very Long Base Interferometry, Gravitational Effects, Radiant Flux Density, Radio Astronomy

Scientific paper

VLBI observations of the double quasar 0957 + 561 at a wavelength of 6 cm are presented. Both the A and B sources were detected on an intercontinental baseline with peak cross-correlated flux densities of 26 + or - 5 and 20 + or - 5 mJy, respectively. This implies peak fringe visibilities of 0.7 + or - 0.2 for both sources. The simplest interpretation of the data is that both sources are about 1 milli-arcsec in diameter. Only a single peak is observed in the fringe-rate spectrum for each source. Hence, the data are inconsistent with a model of a double structure for either source in which the components have a flux density ratio of less than about 1.5 and a separation of greater than 20 milli-arcsec.

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