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Letter to the Editor
SBS 1520+530: A new gravitationally lensed system at z=1.855 *
V.H. Chavushyan 1, 2,
V.V. Vlasyuk 1,
J.A. Stepanian 1 and
Received 3 September 1996 / Accepted 31 October 1996
We report the discovery of a new gravitationally lensed BAL QSO SBS 1520+530 (, ) at =1.855 from the Second Byurakan Survey using observations with the 6m and 1m telescopes of SAO RAS. Two components with apparent V magnitudes 18:m2 and 18:m7 are resolved with a distance separation of 1:006. The spectra, taken with the long-slit spectrograph, exhibit strong SiIV/OIV], CIV and CIII] emission lines with the redshifts 1.855 0.002 and 1.854 0.002, respectively, and two systems of metal-line absorption at =0.7155 0.0009 and 0.8147 0.0009. The blue wing of CIV line displays BAL futures.
SBS 1520+530, the second gravitationally lensed BAL QSO, offers good opportunity for ground-based and space studies of numerous phenomena connected with physics of lensing because of its apparent magnitude and appropriate separation between companions.
Key words: gravitational lensing quasars: emission lines quasars: absorption lines quasars: individual (SBS 1520+530)
* Based on observations from State Research Center Special Astrophysical Observatory of Russian Academy of Sciences, Russia.
Send offprint requests to: V.H. Chavushyan
Online publication: July 3, 1998