J/ApJ/937/34ivo://CDS.VizieR/J/ApJ/937/34doi:10.26093/cds/vizier.19370034CDSMunoz J.A.Kochanek C.S.Fohlmeister J.Wambsganss J.Falco E.,Fores-Toribio R.2024-11-06T20:27:36Z2024-09-06T14:57:28ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgravitational-lensingphotometryvisible-astronomyquasarsWe present new light curves for the four bright images of the five image cluster-lensed quasar gravitational lens system SDSS J1004+4112. The light curves span 14.5yr and allow the measurement of the time delay between the trailing bright quasar image D and the leading image C. When we fit all four light curves simultaneously and combine the models using the Bayesian information criterion, we find a time delay of {Delta}t_DC_=2458.47+/-1.02d (6.73yr), the longest ever measured for a gravitational lens. For the other two independent time delays we obtain {Delta}t_BC_=782.20+/-0.43d (2.14yr) and {Delta}t_AC_=825.23+/-0.46d (2.26yr), in agreement with previous results. The information criterion is needed to weight the results for light curve models with different polynomial orders for the intrinsic variability and the effects of differential microlensing. The results using the Akaike information criterion are slightly different, but, in practice, the absolute delay errors are all dominated by the ~4% cosmic variance in the delays rather than the statistical or systematic measurement uncertainties. Despite the lens being a cluster, the quasar images show slow differential variability due to microlensing at the level of a few tenths of a magnitude.2022ApJ...937...34Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/937/34CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/662/62 : Optical monitoring of SDSS J1004+4112 (Fohlmeister+, 2007)J/MNRAS/450/3665 : CoMaLit. III. LC2 catalog (Sereno+, 2015)J/ApJ/807/178 : Newly rich gal. clusters identified in SDSS-DR12 (Wen+, 2015)J/MNRAS/455/892 : Galaxy cluster concentration-mass relation (Groener+, 2016)J/A+A/618/A56 : Gaia GraL. II. Known mult. imaged quasars (Ducourant+, 2018)J/A+A/634/A27 : SDSS J1004+4112 spectra (Popovic+, 2020)J/A+A/638/A114 : CODEX galaxy clusters catalog (Finoguenov+, 2020)J/MNRAS/503/5763 : SPIDERS galaxy clusters catalogue (Kirkpatrick+, 2021)J/ApJ/911/82 : Sparsity & gas mass fraction of gal. cl. (Corasaniti+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/937/34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/937/34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/937/34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/937/34https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/937/34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/937/34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/937/34/table1Light curves in r-band magnitude for the four quasar imagesmagC[19.35/20.8] Magnitude of image Cmagphot.mag;em.opt.Rfloate_magC[0.01/0.3] Uncertainty in magCmagstat.error;phot.mag;em.opt.RfloatmagD[19.56/21.52] Magnitude of image Dmagphot.mag;em.opt.Rfloate_magD[0.019/0.4] Uncertainty in magDmagstat.error;phot.mag;em.opt.RfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJD[2993.5/8290.7] Julian Date of observation; JD-2450000dtime.epochdoublemagA[18.93/20.4] Magnitude of image Amagphot.mag;em.opt.Rfloate_magA[0.006/0.12] Uncertainty in magAmagstat.error;phot.mag;em.opt.RfloatmagB[19.14/21.03] Magnitude of image Bmagphot.mag;em.opt.Rfloate_magB[0.006/0.2] Uncertainty in magBmagstat.error;phot.mag;em.opt.Rfloat