Abstract
Since the discovery1 of the double quasar Q0957 + 561 A, B by Walsh et al., their proposition that it represents a double image of a single object formed by an intervening galaxy acting as a gravitational lens has been amply confirmed. The intervening galaxy has been detected optically2–4 at a redshift of 0.36 (ref. 5). Further, a remarkable similarity in fine structure of the radio images has been demonstrated with VLBI observations6 and the required frequency invariance of the intensity ratio has been established from the UV7 through the optical8 and IR9 to the radio10 regions of its spectrum. The first UV observations of the double quasar were made with IUE in December 1979, and have been supplemented by data obtained during September and December 1980. Here we present these new data together with an analysis based on the images being a gravitational lens effect.
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Gondhalekar, P., Wilson, R. IUE observations of variability and differences in the UV spectra of double quasar 0957 + 561 A, B. Nature 296, 415–418 (1982). https://doi.org/10.1038/296415a0
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DOI: https://doi.org/10.1038/296415a0
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