J/ApJ/873/117ivo://CDS.VizieR/J/ApJ/873/117doi:10.26093/cds/vizier.18730117CDSShalyapin V.N.Goicoechea L.J.2021-04-27T11:04:35Z2020-09-04T08:49:30ZCDS support team

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

cds-question@unistra.frgravitational-lensingquasarsinfrared-photometryvisible-astronomyphotometryWe present r-band photometric monitoring of the two images, A and B, of the gravitationally lensed quasar SDSS J1442+4055 using the Liverpool Telescope (LT). From the LT light curves between 2015 December and 2018 August, we derive at once a time delay of 25.0+/-1.5d (1{sigma} confidence interval; A is leading) and microlensing magnification gradients below 10^-4^mag/d. The delay interval is not expected to be affected by an appreciable microlensing-induced bias, so it can be used to estimate cosmological parameters. This paper also focuses on new Gran Telescopio Canarias (GTC) and LT spectroscopic observations of the lens system. We determine the redshift of two bright galaxies around the doubly imaged quasar using LT spectroscopy, while GTC data lead to low-noise individual spectra of A, B, and the main lensing galaxy, G1. The G1 spectral shape is accurately matched to an early-type galaxy template at z=0.284, and it has potential for further relevant studies. Additionally, the quasar spectra show absorption by metal-rich gas at z~2. This dusty absorber is responsible for an extinction bump at a rest-frame wavelength of 2209+/-2{AA}, which has strengths of ~0.47 and 0.76mag/{mu}m for A and B, respectively. In such an intervening system, the dust-to-gas ratio, gas-phase metallicity indicator [Zn/H], and dust depletion level [Fe/Zn] are relatively high.2019ApJ...873..117Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/873/117CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/179 : Southern Spectrophotometric Standards. I + II (Hamuy+ 1992,94)VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)J/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007)J/A+A/478/701 : Color excess of SDSS QSOs with DLA systems (Vladilo+, 2008)J/A+A/488/481 : Time delays and H0 from WFI J2033-4723 (Vuissoz+, 2008)J/A+A/596/A77 : SDSS J1339+1310 spectra and light curves (Goicoechea+, 2016)J/MNRAS/465/4914 : R-band light curves of HE 0435-1223 (Bonvin+, 2017)J/ApJ/836/14 : LCs & sp. of SDSS J1515+1511 lens system (Shalyapin+, 2017)J/A+A/616/A118 : Lensed QSOs LCs & spectral monitoring (Gil-Merino+ 2018)J/ApJ/860/41 : Spectral & environment data of z~2 QSO pairs (Lusso+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/873/117https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/873/117http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/873/117https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/873/117https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/873/117http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/873/117GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.9095071483222474e-19 3.5906671001499106e-19OpticalInfrareddefaultJ/ApJ/873/117/table1LT-IO:O r-band light curves of SDSS J1442+4055ABrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[7379.2/8359] Modified Julian Date; MJD-50000dtime.epochdoublermagA[17.9/18.2] r-band magnitude of SDSS J1442+4055Amagphot.mag;em.opt.Rfloate_rmagA[0.003/0.02] Uncertainty in rmagAmagstat.error;phot.magfloatrmagB[18.9/19.2] r-band magnitude of SDSS J1442+4055Bmagphot.mag;em.opt.Rfloate_rmagB[0.006/0.03] Uncertainty in rmagBmagstat.error;phot.magfloatrmagS[15.9/16.1] r-band magnitude of the field (control) star S (SDSS J144249.55+405519.4)magphot.mag;em.opt.Rfloate_rmagS[0.003/0.02] Uncertainty in rmagSmagstat.error;phot.magfloatJ/ApJ/873/117/table2GTC-OSIRIS-R500B spectra of SDSS J1442+4055ABG1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3426.7/7247.5] Observed wavelength in {AA}0.1nmem.wldoubleFA[1.8/52.1] Flux of SDSS J1442+4055A in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloate_FA[0.06/1.7] Error in FA0.1nW.m**-3stat.errorfloatFB[0.2/22.7] Flux of SDSS J1442+4055B in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloate_FB[0.05/1.6] Error in FB0.1nW.m**-3stat.errorfloatFG1[-10.1/5.7] Flux of SDSS J1442+4055G1 in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloate_FG1[0.06/1.7] Error in FG10.1nW.m**-3stat.errorfloatJ/ApJ/873/117/table3GTC-OSIRIS-R500R spectra of SDSS J1442+4055ABG1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[4846.7/9252.9] Observed wavelength in {AA}0.1nmem.wldoubleFA[5.5/31.7] Flux of SDSS J1442+4055A in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloate_FA[0.04/0.4] Error in FA0.1nW.m**-3stat.errorfloatFB[2.8/14.4] Flux of SDSS J1442+4055B in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloate_FB[0.03/0.3] Error in FB0.1nW.m**-3stat.errorfloatFG1[1.5/6.1] Flux of SDSS J1442+4055G1 in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloate_FG1[0.04/0.4] Error in FG10.1nW.m**-3stat.errorfloatJ/ApJ/873/117/table4LT-SPRAT spectra of SDSS J1442+4055G2G3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3984.3/8056.1] Observed wavelength in {AA}0.1nmem.wldoubleFG2[-7.4/12.7] Flux of SDSS J1442+4055G2; in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloatFG3[-5.2/11.6] Flux of SDSS J1442+4055G3; in 10^-17^erg/cm2/s/{AA}0.1nW.m**-3phot.fluxfloat