J/A+A/391/481ivo://CDS.VizieR/J/A+A/391/481doi:10.26093/cds/vizier.33910481CDSBurud I.Hjorth J.Courbin F.Cohen J.G.Magain P.Jaunsen A.O.,Kaas A.A.Faure C.Letawe G.2002-09-01T13:22:39Z2002-09-01T13:22:13ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgravitational-lensingquasarsphotometryWe present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope, from February 1999 to May 2001. A time delay of 130+/-3days (1{sigma}) 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_0_=51+/-9km/s/Mpc (1{sigma} error).2002A&A...391..481Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/391/481CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/391/481https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/391/481http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/391/481https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/391/481https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/391/481http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/391/481GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/391/481/table2R-band photometry of SBS 1520+530recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmagARelative magnitude for image A to the reference star S3 (see Fig. 2 of the paper)magphot.mag;em.opt.Rdoublee_magAError on A magmagstat.errordoublemagBRelative magnitude for image B to the reference star S3 (see Fig. 2 of the paper)magphot.mag;em.opt.Rdoublee_magBError on B magmagstat.errordoubleJDJulian Datedtime.epochdouble