Multiple-mirror telescope observations of the twin QSOs 0957+561 A, B

Details Multiple-mirror telescope observations of the twin QSOs 0957+561 A, B Multiple-mirror telescope observations of the twin QSOs 0957+561 A, B

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l..43w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Oct. 15, 1979, p. L43-L46.

Astronomy and Astrophysics

Astrophysics

62

Astronomical Spectroscopy, Quasars, Red Shift, Absorption Spectra, Binary Stars, Emission Spectra, Line Spectra, Mirrors, Spectral Resolution, Spectrographs, Telescopes, Time Lag

Scientific paper

Spectroscopic observations of the twin QSOs 0957+561 A, B obtained with the multiple-mirror telescope are presented. The spectral similarities of the two objects reported by Walsh, Carswell, and Weymann (1979) are confirmed and strengthened. In particular, the absorption-line redshifts are found to differ by 7 + or - 15 km/s. Hypotheses conventionally used to account for the origin of QSO absorption-line systems are examined, and difficulty is encountered in explaining such close agreement in the redshifts. The possibility that a gravitational lens is responsible for forming two images of a single QSO is discussed.

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