VR light curves of three lensed quasarsJ/A+A/683/A119ivo://CDS.VizieR/J/A+A/683/A119doi:10.26093/cds/vizier.36830119CDSSorgenfrei C.Schmidt R.W.Wambsganss J.2024-11-29T20:01:02Z2024-03-15T08:50:53ZCDS support team
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
cds-question@unistra.frgravitational-lensingphotometryvisible-astronomyWe show how to significantly improve difference image analysis (DIA) of gravitationally lensed quasars over long periods of time using Gaia proper motions. DIA requires the subtraction of a reference image from the individual images of a monitoring campaign, using stars in the field to align the images. Since the proper motion of the stars can be of the same order as the pixel size during a several-year campaign, we use Gaia DR3 proper motions to enable a correct image alignment. The proper motion corrected star positions can be aligned by the ISIS package. DIA is carried out using the HOTPAnTS package. We apply point spread function (PSF) photometry to obtain light curves and add a proper motion correction of the PSF star to GALFIT. We apply our method to the light curves of the three gravitationally lensed quasars HE1104-1805, HE2149-2745 and Q2237+0305 in the R and V band, respectively, obtained using 1 m telescopes of the Las Cumbres Observatory from 2014 to 2022. We show that the image alignment and the determination of the lensed quasar positions is significantly improved by this method. The light curves of individual quasar images display intrinsic quasar variations and are affected by chromatic microlensing.2024A&A...683A.119Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A119CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/683/A119https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/683/A119http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/683/A119https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/683/A119https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/683/A119http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/683/A119GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/683/A119/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/683/A119/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/683/A119/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/683/A119/stars?GETtext/xml+votable180.050000true166.6390833-18.35661110.0055555555555555566/19216 25245 483892.762881831355591e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/683/A119?format=asciiOpticaldefaultJ/A+A/683/A119/starsList of studied starsNameStar namemeta.id;meta.maincharlcVShow the V light curvesmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainlcRShow the R light curvesmeta.ref.urlcharFileName1Name of the table with R datameta.id;meta.filecharFileName2Name of the table with V datameta.id;meta.filechar
J/A+A/683/A119/he1104vV-band light curves of HE1104-1805recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleVmagAV magnitude for image Amagphot.mag;em.opt.Vfloate_VmagAError on VmagAmagstat.error;phot.magfloatVmagBV magnitude for image Bmagphot.mag;em.opt.Vfloate_VmagBError on VmagBmagstat.error;phot.magfloatBand[V] Observed bandinstr.bandpasschar
J/A+A/683/A119/he1104rR-band light curves of HE1104-1805recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleRmagAR magnitude for image Amagphot.mag;em.opt.Rfloate_RmagAError on RmagAmagstat.error;phot.magfloatRmagBR magnitude for image Bmagphot.mag;em.opt.Rfloate_RmagBError on RmagBmagstat.error;phot.magfloatBand[R] Observed bandinstr.bandpasschar
J/A+A/683/A119/he2149vV-band light curves of HE2149-2745recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleVmagAV magnitude for image Amagphot.mag;em.opt.Vfloate_VmagAError on VmagAmagstat.error;phot.magfloatVmagBV magnitude for image Bmagphot.mag;em.opt.Vfloate_VmagBError on VmagBmagstat.error;phot.magfloatBand[V] Observed bandinstr.bandpasschar
J/A+A/683/A119/he2149rR-band light curves of HE2149-2745recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleRmagAR magnitude for image Amagphot.mag;em.opt.Rfloate_RmagAError on RmagAmagstat.error;phot.magfloatRmagBR magnitude for image Bmagphot.mag;em.opt.Rfloate_RmagBError on RmagBmagstat.error;phot.magfloatBand[R] Observed bandinstr.bandpasschar
J/A+A/683/A119/q2237vV-band light curves of Q2237+0305recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoubleVmagAV magnitude for image Amagphot.mag;em.opt.Vfloate_VmagAError on VmagAmagstat.error;phot.magfloatVmagBV magnitude for image Bmagphot.mag;em.opt.Vfloate_VmagBError on VmagBmagstat.error;phot.magfloatVmagC? V magnitude for image C (only for Q2237+0305)magphot.mag;em.opt.Vfloatnullablee_VmagC? Error on VmagC (only for Q2237+0305)magstat.error;phot.magfloatnullableVmagD? V magnitude for image D (only for Q2237+0305)magphot.mag;em.opt.Vfloatnullablee_VmagD? Error on VmagD (only for Q2237+0305)magstat.error;phot.magfloatnullableBand[V] Observed bandinstr.bandpasschar
J/A+A/683/A119/q2237rR-band light curves of Q2237+0305RmagAR magnitude for image Amagphot.mag;em.opt.Rfloate_RmagAError on RmagAmagstat.error;phot.magfloatRmagBR magnitude for image Bmagphot.mag;em.opt.Rfloate_RmagBError on RmagBmagstat.error;phot.magfloatRmagC? R magnitude for image C (only for Q2237+0305)magphot.mag;em.opt.RfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Datedtime.epochdoublee_RmagC? Error on RmagC (only for Q2237+0305)magstat.error;phot.magfloatnullableRmagD? R magnitude for image D (only for Q2237+0305)magphot.mag;em.opt.Rfloatnullablee_RmagD? Error on RmagD (only for Q2237+0305)magstat.error;phot.magfloatnullableBand[R] Observed bandinstr.bandpasschar