Candidate Double AGNs from Gaia & WISE (CDAGN) J/ApJS/264/4 ivo://CDS.VizieR/J/ApJS/264/4 doi:10.26093/cds/vizier.22640004 CDS Makarov V.V. Secrest N.J. 2023-08-25T11:34:07Z 2023-04-13T13:21:19Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr active-galactic-nuclei quasars infrared-photometry visible-astronomy two-color-diagrams redshifted gravitational-lensing Making use of strong correlations between closely separated multiple or double sources and photometric and astrometric metadata in Gaia Early Data Release 3 (EDR3), we generate a catalog of candidate double- and multiply imaged lensed quasars and active galactic nuclei (AGNs), comprising 3140 systems. It includes two partially overlapping parts: a sample of distant (redshifts mostly greater than 1) sources with perturbed data; and systems that have been resolved into separate components by Gaia at separations less than 2". For the first part, which is roughly one-third of the published catalog, we synthesized 0.617 million redshifts using multiple machine-learning prediction and classification methods, using independent photometric and astrometric data from Gaia EDR3 and the Wide-field Infrared Survey Explorer, with accurate spectroscopic redshifts from the Sloan Digital Sky Survey (SDSS) as a training set. Using these synthetic redshifts, we estimate a 4.9% rate of interlopers with spectroscopic redshifts below 1 in this part of the catalog. Unresolved candidate double and dual AGNs and quasars are selected as sources with a marginally high BP/RP excess factor (phot_bp_rp_excess_factor), which is sensitive to source extent, limiting our search to high-redshift quasars. For the second part of the catalog, additional filters on measured parallax and near-neighbor statistics are applied to diminish the propagation of the remaining stellar contaminants. The estimated rate of the positives (double or multiple sources) is 98%, and the estimated rate of dual (physically related) quasars is greater than 54%. A few dozen serendipitously found objects of interest are discussed in more detail, including known and new lensed images, planetary nebulae, young IR stars of peculiar morphology, and quasars with catastrophic redshift errors in SDSS. 2023ApJS..264....4M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/264/4 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to IV/24 : Catalogue of Galactic Planetary Nebulae (Kohoutek, 2001) II/328 : AllWISE Data Release (Cutri+ 2013) VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020) I/350 : Gaia EDR3 (Gaia Collaboration, 2020) J/ApJS/117/361 : PNe in NRAO VLA Sky Survey (Condon+ 1998) J/ApJS/165/1 : BAL QSOs from SDSS DR3 (Trump+, 2006) J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009) J/PASJ/62/525 : SiO maser survey off the Galactic Plane (Deguchi+, 2010) J/ApJ/755/31 : Compilation of 122 strong gravitational lenses (Cao+, 2012) J/ApJ/753/42 : Double-peaked AGN. I. Dual AGN candidates (Comerford+, 2012) J/AJ/143/119 : SDSS Quasar Lens Search. V. Final catalog (Inada+, 2012) J/A+A/544/A51 : R-band phot. of the lensed quasar UM673 (Koptelova+, 2012) J/ApJ/746/L22 : Dual AGNs in the nearby Universe (Koss+, 2012) J/A+A/582/A68 : Database of circumstellar OH masers (Engels+, 2015) J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015) J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016) J/ApJ/835/L30 : Dislodged AGNs (Makarov+, 2017) J/MNRAS/466/3088 : Lensed and extended quasars (Williams+, 2017) J/A+A/618/A56 : Gaia GraL. II. Known mult. imaged quasars (Ducourant+, 2018) J/other/JAD/24.3 : Optically Variable Quasars in AllWISE/PS1 (Usatov, 2018) J/A+A/622/A165 : Gaia GraL. III. New lensed systems (Delchambre+, 2019) J/A+A/631/A87 : Close pairs of galaxies in MUSE Deep Fields (Ventou+, 2019) J/A+A/631/A87 : Close pairs of galaxies in MUSE Deep Fields (Ventou+, 2019) J/A+A/644/A159 : The third realization of the ICRF, ICRF3 (Charlot+, 2020) J/A+A/638/A103 : Central stars of PNe in Gaia DR2 (Chornay+, 2020) J/A+A/656/A51 : Planetary nebulae in Gaia EDR3 (Gonzalez-Santamaria+, 2021) J/A+A/649/A3 : Gaia Early Data Release 3 phot. passbands (Riello+, 2021) J/A+A/660/A16 : Quasars with large proper motions (Souchay+, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/264/4 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/264/4 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/264/4 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/264/4 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/264/4 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/264/4 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/264/4/table1 (The candidate dual AGN (CDAGN) catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/264/4/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/264/4/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/264/4/table1? 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45847 45853 45887 45899 45960 45964 45982 46004 46006 46012-46013 46032 46040 46063 46080 46083-46084 46115 46143 46176 46179 46205 46210 46214 46227 46261 46285 46299 46334 46361 46363 46371 46374 46397 46406 46424-46425 46458 46472 46474 46489 46522 46539 46567-46568 46574 46592 46613 46636-46637 46673 46686 46722-46723 46735 46737 46749 46789 46792 46798 46816 46820 46845 46861 46865 46873 46878 46887 46895 46936 46947-46948 46955 46958 46961 46994 47010 47013 47020 47031 47069 47074 47105 47113 47126 47132 47146 47148-47149 47151 47156 47184 47186 47200-47201 47220-47221 47241 47244 47246 47262 47267 47271 47278 47280 47282 47285 47289 47300 47302 47310 47326-47327 47334 47348 47372 47395 47399 47405 47409 47418 47426-47427 47429 47434 47442 47444 47448 47474 47489 47502 47508 47532 47539 47563 47573 47596 47615 47618 47624 47632 47638 47641-47642 47669 47677 47681 47689 47716 47719 47725 47739 47751 47773 47804 47825 47834 47837-47838 47843 47873 47883 47892 47895-47896 47912 47920-47921 47924 47926 47930-47931 47936 47939 47942-47943 47952 47971 47973 47983 47990 48010 48027 48034 48046 48050 48102 48116 48128 48137 48152 48154 48185 48194 48210 48245 48257 48272 48278 48332 48349 48358 48371 48373 48375 48394 48398 48433 48526 48541 48580 48595 48614 48630 48632 48641 48652 48669 48675-48676 48697 48706 48721 48726 48771 48778 48781 48802 48810 48814 48843 48856 48877 48888 48890 48914 48920 48933 48944 49003 49013 49029 49032 49043 49047 49072 49076 49080 49114 49131 1.9867573869263685e-19 3.916500758235022e-19 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/264/4?format=ascii Optical Infrared default J/ApJS/264/4/table1 The candidate dual AGN (CDAGN) catalog recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int WISEA WISEA identifier (JHHMMSS.ss+DDMMSS.s) from Secrest+ (2015, J/ApJS/221/12) meta.id;meta.main char RA_ICRS Gaia EDR3 right ascension (ICRS) at Ep=2016.0 deg pos.eq.ra;meta.main DE_ICRS Gaia EDR3 declination (ICRS) at Ep=2016.0 deg pos.eq.dec;meta.main Gaia Gaia EDR3 identifier meta.id.cross Gmag [11.42/21.12]? Gaia EDR3 G band magnitude mag phot.mag;em.opt float nullable W1mag [5.2/17.6] WISE 3.4 micron band magnitude mag phot.mag;em.IR.3-4um float W1-W2 [0.5/2.2] WISE 3.4-4.6 micron band color mag phot.color;em.IR.3-4um;em.IR.4-8um float E(BP/RP) [0.88/16.8]? Gaia EDR3 phot_bp_rp_excess_factor value arith.factor;phot.flux;em.opt float nullable z [0.058/6.7]? SDSS/BOSS redshift src.redshift float nullable zpre [0.052/5]? Machine Learning (ML)-predicted redshift from this work src.redshift;meta.modelled float nullable zcl [-1/1] ML-classified redshift from this work (1) meta.code int sep [-1/2] Separation from nearest neighbor from this work (Equal to "-1" if sep>2") arcsec pos.angDistance float DRQ16 Display the SDSS -DR16 quasar cat. (VII/289) within 3" meta.ref.url char Sloan Display the online SDSS-DR16 data for the nearest object meta.ref.url char _RA.icrs Right ascension (ICRS) at Epoch=J2016. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.ra indexed _DE.icrs Declination (ICRS) at Epoch=J2016. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) deg pos.eq.dec indexed