UV spectra of the twin QSOs 0957+561 A, B

Details UV spectra of the twin QSOs 0957+561 A, B UV spectra of the twin QSOs 0957+561 A, B

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..461g&link_type=abstract

Nature, vol. 285, June 12, 1980, p. 461-463.

Astronomy and Astrophysics

Astronomy

11

Line Spectra, Quasars, Stellar Spectra, Ultraviolet Astronomy, Absorption Spectra, Emission Spectra, Galactic Clusters, Stellar Spectrophotometry, Ultraviolet Spectra

Scientific paper

The similarity of all the observed features of the twin QSOs 0957 + 561 A and B has led to the proposal that they constitute a single object, a double image of which is formed by an intervening massive galaxy which acts as a gravitational lens. In the present paper, the first UV observations of Q0957 + 561 A, B are presented and are discussed in terms of the lens hypothesis. The discussion shows that the two light paths are almost extinction free, either because the intervening galaxy is dust-free or the light paths are through its dust-free halo, and that a ratio of unity for the UV and radio flux ratios is in keeping with one of the most fundamental predictions of the gravitational lens theory, and therefore provides strong evidence in favor of the lens hypothesis.

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