MTRLI observations of the double QSO at 408 MHz

Details MTRLI observations of the double QSO at 408 MHz MTRLI observations of the double QSO at 408 MHz

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.288...69n&link_type=abstract

Nature, vol. 288, Nov. 6, 1980, p. 69, 70.

Astronomy and Astrophysics

Astrophysics

5

Astrophysics, Gravitational Lenses, Microwave Spectra, Quasars, Radio Interferometers, Astronomical Maps, Radiant Flux Density, Radio Galaxies

Scientific paper

Observations made by the Jodrell Bank Multi-Telescope Radio-Linked Interferometer (MTRLI) at 408 MHz of the twin quasars 0957+561 A, B, which are believed to be gravitational lens images of the same quasar, are presented. The 408 MHz map derived from observations made by four interferometer stations with six simultaneous independent baselines up to 127 km reveals the general features of that made with higher resolution at 5 GHz. Analysis of the emission in the neighborhood of component B reveal the contribution of quasar B to be that of a point source at the position of the peak with a flux density of 55 mJy, with residual emission from a point source 1.2 arcsec from B which can be attributed either to the intervening galaxy acting as the gravitational lens or a third quasar image. The ratio of the flux densities of components A and B is found to be 0.70, which is within the range of published values obtained at wavelengths from the radio to the UV, in support of the gravitational lens interpretation. Observations have allowed the extension of the radio spectra of the components, which are observed to show marked curvature with a high-frequency fall-off.

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