Support for the Gravitational Lens Interpretation of SBS 0909+532
The system SBS 0909+532A, B is a double consisting of a quasar and a fainter component that was, until now, spectroscopically unresolved. Spectra taken in good seeing conditions ( {FWHM}=1^{''} ) with the 4.2 m William Herschel Telescope separate the A and B components, showing that both are quasars with the same redshift, z=1.377 , and identical
Oscoz, A. et al.
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1997