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H band observations with a spatial resolution of 0.15" carried out with theCanada-France-Hawaii Telescope adaptive optics system show a galaxy between thecomponents of the double BAL quasar SBS 1520+530, thereby confirming thissystem as a gravitational lens. The galaxy is located 0.40" from the fainter ofthe two QSO images and is offset 0.12" from the line joining them. The Hmagnitude of the lensing galaxy is ~1 mag fainter than expected from thevelocity dispersion derived for the lensing galaxy were it at z = 0.71 or z =0.81, the redshifts of the two absorption line systems.

Detection of the Galaxy Lensing the Doubly Imaged Quasar SBS 1520+530