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Astron. Astrophys. 318, L67-L70 (1997)

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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 L.K. Erastova ** 2

1 Special Astrophysical Observatory RAS, Nizhnij Arkhyz, Karachai-Cherkessia, 357147 Russia
2 Byurakan Astrophysical Observatory, Byurakan, 378433 Armenia
e-mail: chavush@sao.ru, vvlas@sao.ru, jstep@sao.ru, and lke@sao.ru

Received 3 September 1996 / Accepted 31 October 1996


We report the discovery of a new gravitationally lensed BAL QSO SBS 1520+530 ([FORMULA], [FORMULA]) at [FORMULA] =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 [FORMULA] 0.002 and 1.854 [FORMULA] 0.002, respectively, and two systems of metal-line absorption at [FORMULA] =0.7155 [FORMULA] 0.0009 and 0.8147 [FORMULA] 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.
** Present address: Special Astrophysical Observatory RAS, Nizhnij Arkhyz, 357147 Russia

Send offprint requests to: V.H. Chavushyan

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998