J/ApJ/836/14ivo://CDS.VizieR/J/ApJ/836/14doi:10.26093/cds/vizier.18360014CDSShalyapin V.N.Goicoechea L.J.2017-11-06T14:04:07Z2017-10-06T11:30:06ZCDS support team

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

cds-question@unistra.frgravitational-lensingvisible-astronomysloan-photometryspectroscopyquasarsWe analyze new optical observations of the gravitational lens system SDSS J1515+1511. These include a 2.6-year photometric monitoring with the Liverpool Telescope (LT) in the r band, as well as a spectroscopic follow-up with the LT and the Gran Telescopio Canarias (GTC). Our r-band LT light curves cover a quiescent microlensing period of the doubly imaged quasar at z_s_=2.049, which permits us to robustly estimate the time delay between the two images A and B: 211+/-5d (1{sigma} confidence interval; A is leading). Unfortunately, the main lensing galaxy (G1) is so faint and close to the bright quasar that it is not feasible to accurately extract its spectrum through the GTC data. However, assuming the putative redshift z_G1_=0.742, the GTC and LT spectra of the distant quasar are used to discuss the macrolens magnification, and the extinction and microlensing effects in G1. The new constraints on the time delay and macrolens magnification ratio essentially do not change previous findings on the mass scale of G1 and external shear, while the redshift of the lensing mass is found to be consistent with the assumed value of z_G1_. This is clear evidence that G1 is indeed located at z_G1_=0.742. From the GTC data, we also obtain the redshift of two additional objects (the secondary galaxy G2 and a new absorption system) and discuss their possible roles in the lens scenario.2017ApJ...836...14Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/14CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/836/14/table1*LT r-band light curves of SDSS J1515+1511ABrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoublermagA[18/18.3] r-band magnitude of SDSS J1515+1511Amagphot.mag;em.opt.Rfloate_rmagA[0.004/0.03] Uncertainty in rmagAmagstat.error;phot.magfloatrmagB[18.3/18.7] r-band magnitude of SDSS J1515+1511Bmagphot.mag;em.opt.Rfloate_rmagB[0.004/0.03] Uncertainty in rmagBmagstat.error;phot.magfloatrmagS[18.1/18.2] r-band magnitude of the field (control) star Smagphot.mag;em.opt.Rfloate_rmagS[0.003/0.02] Uncertainty in rmagSmagstat.error;phot.magfloatJ/ApJ/836/14/table2*GTC-OSIRIS-R500B spectra of SDSS J1515+1511ABrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3567/7244] GTC-OSIRIS-R500B spectral wavelength, in Angstroms0.1nmem.wldoubleFluxA[9.6/95.2] Flux, SDSS J1515+1511A, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatFluxB[7/58.3] Flux, SDSS J1515+1511B, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatJ/ApJ/836/14/table3*GTC-OSIRIS-R500R spectra of SDSS J1515+1511ABG1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[4846.6/9252] GTC-OSIRIS-R500R spectral wavelength, in Angstroms0.1nmem.wldoubleFluxA[5.2/26.3] Flux, SDSS J1515+1511A, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatFluxB[3.9/19] Flux, SDSS J1515+1511B, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatFluxG1[-0.1/1.2] Flux, SDSS J1515+1511G1, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatJ/ApJ/836/14/table4*LT-SPRAT-blue/red spectra of SDSS J1515+1511AB (2015 August)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3980.4/8055.8] LT-SPRAT-blue/red spectral wavelength, in Angstroms0.1nmem.wldoubleFluxA[7.3/51.5] Flux, SDSS J1515+1511A, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatFluxB[4.5/32] Flux, SDSS J1515+1511B, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatJ/ApJ/836/14/table5*LT-SPRAT-blue spectra of SDSS J1515+1511AB (2016 March)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3968.4/8060] LT-SPRAT-blue spectral wavelength, in Angstroms0.1nmem.wldoubleFluxA[7.6/51] Flux, SDSS J1515+1511A, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloatFluxB[5.7/35.1] Flux, SDSS J1515+1511B, in 10^-17^erg/cm^2^/s/{AA} units1e-19W.m**-2.nm**-1phot.fluxfloat