J/ApJ/964/173ivo://CDS.VizieR/J/ApJ/964/173CDSRivera A.B.Morgan C.W.Florence S.M.Kniezewski K.Millon M.,Courbin F.Dahm S.E.Vrba F.J.Tilleman T.M.Cornachione M.A.,Asfandiyarov I.M.Ehgamberdiev S.A.Burkhonov O.A.2026-08-20T09:20:44Z2026-08-20T10:18:50ZCDS support team

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

cds-question@unistra.frgravitational-lensingquasarsphotometryvisible-astronomyWe analyze variability in 15-season optical lightcurves from the doubly imaged lensed quasar SDSS J165043.44+425149.3, comprising five seasons of monitoring data from the Maidanak Observatory (277 nights in total, including the two seasons of data previously presented in Vuissoz+ 2007A&A...464..845V), five seasons of overlapping data from the Mercator telescope (269 nights), and 12 seasons of monitoring data from the US Naval Observatory, Flagstaff Station at lower cadence (80 nights). We update the 2007 time-delay measurement for SDSS_J165043.44+425149.3 with these new data, finding a time delay of {Delta}t_AB_=-55.1_-3.7_^+4.0^days, with image A leading image B. We analyze the microlensing variability in these lightcurves using a Bayesian Monte Carlo technique to yield measurements of the size of the accretion disk at {lambda}_rest_=2420{AA}, finding a half-light radius of log(r1/2/cm)=16.19_-0.58_^+0.38^ assuming a 60{deg} inclination angle. This result is unchanged if we model 30% flux contamination from the broad-line region. We use the width of the MgII line in the existing Sloan Digital Sky Survey spectra to estimate the mass of this system's supermassive black hole, finding M_BH_=2.47x10^9^M_{sun}_. We confirm that the accretion disk size in this system, whose black hole mass is on the very high end of the MBH scale, is fully consistent with the existing quasar accretion disk size-black hole mass relation.2024ApJ...964..173Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/964/173CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)II/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)VII/290 : The Million Quasars (Milliquas) catalogue, version 7.2 (Flesch, 2021)J/A+A/427/387 : QORG catalog of radio/X-ray sources (Flesch+, 2004)J/ApJ/699/800 : Mass functions of active black holes (Vestergaard+, 2009)J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)J/AJ/143/119 : SDSS Quasar Lens Search. V. Final catalog (Inada+, 2012)J/ApJS/206/4 : SED & bol. corrections for luminous QSOs (Krawczyk+, 2013)J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)J/ApJ/869/106 : SMARTS+Euler R-band obs. of WFI J2033-4723 (Morgan+, 2018)J/A+A/640/A105 : R-band light curves of 23 lensed QSOs (Millon+, 2020)J/ApJ/888/73 : Varstrometry of SDSS quasars with Gaia DR2 (Hwang+, 2020)J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)J/ApJS/250/3 : Variable MgII NALs in SDSS DR14 (Chen+, 2020)J/AJ/161/45 : KODIAQ DR3: quasars (0.1<zem<6.4) with ESI (O'Meara+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/964/173https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/964/173http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/964/173https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/964/173https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/964/173http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/964/173GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/964/173/table2r-band light curves for SDSS J165043.44+425149.3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[3132.9/9748.72] Heliocentric Julian Date, HJD-2450000dtime.epochdoublermagImgA[17.57/18.12] Image A r band (AB) magnitudemagphot.mag;em.opt.Rfloate_rmagImgA[0.001/0.03] Uncertainty in ImageAmagmagstat.error;phot.mag;em.opt.RfloatrmagImgB[19.15/19.95] Image B r band (AB) magnitudemagphot.mag;em.opt.Rfloate_rmagImgB[0.004/0.1] Uncertainty in ImageBmagmagstat.error;phot.mag;em.opt.RfloatObsObservatory (Maidanak, Mercator or USNO)meta.id;instr.obstychar