Time delay and lens redshift for the doubly imaged BAL quasar SBS 1520+530

peer reviewed We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope. A time delay of 130+/-3 days (1sigma ) is determined from the light curves. In addition, spectra of SBS 1520+530 obtained at the Keck Obs...

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Bibliographic Details
Main Authors: Burud, I., Hjorth, J., Courbin, F., Cohen, J. G., Magain, Pierre, Jaunsen, A. O., Kaas, A. A., Faure, C., Letawe, Géraldine
Format: Article in Journal/Newspaper
Language:English
Published: EDP Sciences 2002
Subjects:
gravitational lensing
quasars: individual: SBS 1520+530
cosmology: cosmological parameters
Physical
chemical
mathematical & earth Sciences
Space science
astronomy & astrophysics
Physique
chimie
mathématiques & sciences de la terre
Aérospatiale
astronomie & astrophysique
Iceland
Online Access:https://orbi.uliege.be/handle/2268/32178
https://doi.org/10.1051/0004-6361:20020856
Description
Summary:peer reviewed We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope. A time delay of 130+/-3 days (1sigma ) is determined from the light curves. In addition, spectra of SBS 1520+530 obtained at the Keck Observatory are spatially deconvolved in order to extract the spectrum of the faint lensing galaxy, free of any contamination by the light from the bright quasar images. This spectrum indicates a lens redshift z=0.717, in agreement with one of the absorption systems found in the quasar spectra. The best mass model of the system includes a second nearby galaxy and a cluster of galaxies in addition to the main lensing galaxy. Adopting this model and an Omega =0.3, Lambda =0.7 cosmology, our time-delay measurement yields a Hubble constant of H[SUB]0[/SUB]=51 +/- 9 km s[SUP]-1[/SUP] Mpc[SUP]-1[/SUP] (1sigma error). Based on observations made with the Nordic Optical, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias and the W. M. Keck Observatory which is operated jointly by the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/391/481

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