J/ApJS/221/12ivo://CDS.VizieR/J/ApJS/221/12doi:10.26093/cds/vizier.22210012CDSSecrest N.J.Dudik R.P.Dorland B.N.Zacharias N.Makarov V.Fey A.,Frouard J.Finch C.2017-01-23T22:00:00Z2016-02-05T15:37:47ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiinfrared-photometryredshiftedastronomical-object-identificationsurveysWe present an all-sky sample of ~1.4 million active galactic nuclei (AGNs) meeting a two-color infrared photometric selection criteria for AGNs as applied to sources from the Wide-field Infrared Survey Explorer final catalog release (AllWISE). We assess the spatial distribution and optical properties of our sample and find that the results are consistent with expectations for AGNs. These sources have a mean density of ~38 AGNs per square degree on the sky, and their apparent magnitude distribution peaks at g~20, extending to objects as faint as g~26. We test the AGN selection criteria against a large sample of optically identified stars and determine the "leakage" (that is, the probability that a star detected in an optical survey will be misidentified as a quasi-stellar object (QSO) in our sample) rate to be <=4.0x10^-5^. We conclude that our sample contains almost no optically identified stars (<=0.041%), making this sample highly promising for future celestial reference frame work as it significantly increases the number of all-sky, compact extragalactic objects. We further compare our sample to catalogs of known AGNs/QSOs and find a completeness value of >~84% (that is, the probability of correctly identifying a known AGN/QSO is at least 84%) for AGNs brighter than a limiting magnitude of R<~19. Our sample includes approximately 1.1 million previously uncataloged AGNs.2015ApJS..221...12Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/221/12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)II/328 : AllWISE Data Release (Cutri+ 2013)J/A+A/583/A75 : Large Quasar Astrometric Catalog 3 (LQAC-3) (Souchay+, 2015)J/AJ/150/58 : VLBI ICRF2 (Fey+, 2015)J/ApJ/807/129 : X-ray to MIR luminosities relation of AGNs (Stern, 2015)J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)J/ApJS/205/6 : T dwarf population revealed by WISE (Mace+, 2013)J/A+A/537/A99 : Large Quasar Astrometric Catalog 2 (LQAC-2) (Souchay+, 2012)J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)J/AJ/133/186 : Optical spectroscopy of 77 luminous AGNs and QSOs (Lacy+, 2007)J/A+A/418/465 : Mid-infrared and hard X-ray emission in AGN (Lutz+, 2004)http://www.sdss3.org/ : SDSS-III home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/221/12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/221/12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/221/12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/221/12https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/221/12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/221/12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/221/12/table1 (Mid-IR AGNs data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/221/12/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/221/12/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/221/12/table1?GETtext/xml+votable180.050000true15.3030541-2.17041410.0055555555555555560/0 2 5 6 11 1/5 6 16 17 30 33 34 35 38 39 43 2/16 18 19 28 29 31 48 49 51 52 53 55 58 59 61 62 63 72 74 75 77 78 79 117 124 126 127 128 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Should Not be used for identification.meta.recordintWISEAAllWISE IAU identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000AllWISE Right Ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000AllWISE Declination (J2000)degpos.eq.dec;meta.mainindexedW1-W2[0.4/2.6] AllWISE W1-W2 (3.4-4.6um) color indexmagphot.color;em.IR;em.IRfloatW2-W3[1.9/7.8] AllWISE W2-W3 (4.6-12um) color indexmagphot.color;em.IR;em.IRfloatW1mag[4.5/19] AllWISE W1 (3.4um) magnitudemagphot.mag;em.IR.3-4umfloatgmag[0/25.8]? Compiled g band magnitude; SDSS bandpass (1)magphot.mag;em.opt.Bfloatnullablez[-0.002/7.02]? Compiled Redshift (2)src.redshiftdoublenullablef_z[ps] Flag on Redshift, s=spec; p=photometa.codecharLQAC2LQAC2 identifier (Souchay+ 2012, J/A+A/537/A99)meta.id.crosscharHMQMILLIQUAS identifier (Flesch+, 2015, VII/273)meta.id.crosscharSloanDisplay the SDSS data for the nearest objectmeta.ref.urlchar