J/ApJ/921/42ivo://CDS.VizieR/J/ApJ/921/42doi:10.26093/cds/vizier.19210042CDSStern D.Djorgovski S.G.Krone-Martins A.Sluse D.Delchambre L.,Ducourant C.Teixeira R.Surdej J.Boehm C.den Brok J.Dobie D.,Drake A.Galluccio L.Graham M.J.Jalan P.Kluter J.,Le Campion J.-F.Mahabal A.Mignard F.Murphy T.Nierenberg A.,Scarano S. Jr,Simon J.,Slezak E.,Spindola-Duarte C.,Wambsganss J.2023-07-03T14:35:42Z2023-03-28T15:41:25ZCDS support team

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

cds-question@unistra.frgravitational-lensingquasarsvisible-astronomyspectroscopyredshiftedCombining the exquisite angular resolution of Gaia with optical light curves and WISE photometry, the Gaia Gravitational Lenses group (GraL) uses machine-learning techniques to identify candidate strongly lensed quasars, and has confirmed over two dozen new strongly lensed quasars from the Gaia Data Release 2. This paper reports on the 12 quadruply imaged quasars identified by this effort to date, which is a ~20% increase in the total number of confirmed quadruply imaged quasars. We discuss the candidate selection, spectroscopic follow-up, and lens modeling. We also report our spectroscopic failures as an aid for future investigations.2021ApJ...921...42Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/42CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)I/345 : Gaia DR2 (Gaia Collaboration, 2018)VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)VII/277 : The Million Quasars (Milliquas) catalog (Flesch, 2016)VII/290 : The Million Quasars (Milliquas) catalogue, version 7.2 (Flesch, 2021)J/ApJ/651/61 : Opt. thick absorbers near luminous quasars (Hennawi+, 2006)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/ApJ/775/116 : z<0.06 active BH galaxies from SDSS-DR8 (Reines+, 2013)J/ApJ/798/95 : HE1104-1805 BVRIJ light curves (Blackburne+, 2015)J/ApJS/234/23 : The WISE AGN candidates catalogs (Assef+, 2018)J/A+A/618/A56 : Gaia GraL. II. Known multiply imaged QSOs (Ducourant+, 2018)J/A+A/622/A165 : Gaia GraL. III. New lensed systems (Delchambre+, 2019)J/A+A/632/A56 : KiDS-BEXGO catalog (Khramtsov+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/921/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/921/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/921/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/921/42https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/921/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/921/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/921/42/table6 (Invalidated GraL lens candidates (i.e., asterisms))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/921/42/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/921/42/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/921/42/table6?GETtext/xml+votable180.050000true0.412520.666670.0055555555555555566/2006 2230 2404 2583 2791 2866 2936 3740 3973 4420 4608 4712 4728 4748 4779 4813 4819 4851 5371 5596 5636 6198 6291 7064 8368 8791 9300 9372 9388 9609 9634 9660 9863 10088 10180 10300 12382 12402 12429 12563 12643 12674 12786 12888 13133 13269 13357 13367 13374 13826 13839 14117 14120 14502 14585 14908 15275 15287 17185 19109 19190 19381 19420 19454 20225 20268 20304 20446 20472 20594 20767 20802 22336 22445 22458 22492 23029 23596 23658 23882 23913 24080 24353 24406 25578 25682 25941 26006 26191 26311 26420 26651 27277 27375 27457 27550 27822 29347 30790 31119 31134 31258 31392 31637 31868 32354 32510 32520 32526 36622 38422 38605 39853 40362 40628 40655-40656 40809 40828 40931 40949 42010 42926 42931 43576 44589 45021 48777 48808 48822 48892https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/921/42?format=asciiOpticaldefaultJ/ApJ/921/42/table2*Confirmed GraL quad lensesExpExposure timestime.duration;obs.exposurecharz[0.77/3.1]? Spectroscopic redsfhitsrc.redshiftfloatnullableNotesNotesmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGraLGraL identifier (JHHMMSS.s+DDMMSS)meta.id;meta.maincharSep[0.7/10.1]? Maximum lens separation (1)arcminpos.angDistance;stat.maxfloatnullableNightObservation night code (G1)meta.id;obscharPA[-10/352] Position angledegpos.posAngintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/921/42/table6Invalidated GraL lens candidates (i.e., asterisms)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGraLGraL position-based identifier (JHHMM+DDMM)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainNightObservation night code (G1)meta.id;obscharPA[0/356] Position Angledegpos.posAngintExpExposure Timestime.duration;obs.exposurecharNotesNotesmeta.notechar