J/AJ/137/3884ivo://CDS.VizieR/J/AJ/137/3884doi:10.26093/cds/vizier.51373884CDSRichards G.T.Deo R.P.Lacy M.Myers A.D.Nichol R.C.Zakamska N.L.,Brunner R.J.Brandt W.N.Gray A.G.Parejko J.K.Ptak A.,Schneider D.P.Storrie-Lombardi L.J.Szalay A.S.2017-06-20T13:17:10Z2012-08-06T19:59:25ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesquasarssurveysWe explore the multidimensional, multiwavelength selection of quasars from mid-infrared (MIR) plus optical data, specifically from Spitzer-Infrared Array Camera (IRAC) and the Sloan Digital Sky Survey (SDSS). Traditionally, quasar selection relies on cuts in two-dimensional color space despite the fact that most modern surveys (optical and IR) are done in more than three bandpasses. In this paper, we apply modern statistical techniques to combined Spitzer MIR and SDSS optical data, allowing up to eight-dimensional (8-D) color selection of quasars. Using a Bayesian selection method, we catalog 5546 quasar candidates to an 8.0{mu}m depth of 56{mu}Jy over an area of ~24{deg}^2^. Roughly 70% of these candidates are not identified by applying the same Bayesian algorithm to 4-color SDSS optical data alone. The 8-D optical+MIR selection on this data set recovers 97.7% of known type 1 quasars in this area and greatly improves the effectiveness of identifying 3.5<z<5 quasars which are challenging to identify (without considerable contamination) using MIR data alone.2009AJ....137.3884Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/137/3884CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)II/282 : SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)http://www.sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/137/3884https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/137/3884http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/137/3884https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/137/3884https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/137/3884http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/137/3884GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/137/3884/catalog (Quasar Candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/137/3884/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/137/3884/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/137/3884/catalog?GETtext/xml+votable180.050000true149.32614812.71395390.005555555555555556Cone search capability for table J/AJ/137/3884/table7 (XMM-Newton objects in the XFLS area)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/137/3884/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/137/3884/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/137/3884/table7?GETtext/xml+votable180.050000true257.529588159.19101390.0055555555555555565/1511 1517 1519 2410 2538 2547 6814 6/6067 6073 6075 6090 6091 6112 6114 6120 7444 7445 9463 9469 9471 9633 9634 9635 9638 10146 10147 10151 10157 10183 10200 10202 10212 10213 10214 11349 11520 11522 27245 27247 273442.0616683193919197e-20 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/137/3884?format=asciiInfrareddefaultJ/AJ/137/3884/catalogQuasar CandidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSimbad column added by the CDSmeta.notecharSeq[1/6138] Unique catalog number, <[RDL2009] NNNN> in Simbadmeta.id;meta.mainintprimaryRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainSDSSSDSS Name (JHHMMSS.SS+DDMMSS.S)meta.idcharIDSDSS Object IDmeta.idcharumagSDSS u band PSF asinh magnitude (1)magphot.mag;em.opt.Ufloate_umagError in umagmagstat.error;phot.mag;em.opt.UfloatgmagSDSS g band PSF asinh magnitude (1)magphot.mag;em.opt.Bfloate_gmagError in gmagmagstat.error;phot.mag;em.opt.BfloatrmagSDSS r band PSF asinh magnitude (1)magphot.mag;em.opt.Rfloate_rmagError in rmagmagstat.error;phot.mag;em.opt.RfloatimagSDSS i band PSF asinh magnitude (1)magphot.mag;em.opt.Ifloate_imagError in imagmagstat.error;phot.mag;em.opt.IfloatzmagSDSS z band PSF asinh magnitude (1)magphot.mag;em.opt.Ifloate_zmagError in zmagmagstat.error;phot.mag;em.opt.IfloatF3.6Spitzer/IRAC 3.6 micron band flux densityuJyphot.mag;em.IR.3-4umfloate_F3.6Error in F3.6uJystat.errorfloatF4.5Spitzer/IRAC 4.5 micron band flux densityuJyphot.mag;em.IR.4-8umfloate_F4.5Error in F4.5uJystat.errorfloatF5.8Spitzer/IRAC 5.8 micron band flux densityuJyphot.flux.density;em.IR.4-8umfloate_F5.8Error in F5.8uJystat.errorfloatF8.0Spitzer/IRAC 8.0 micron band flux densityuJyphot.flux.density;em.IR.8-15umfloate_F8.0Error in F8.0uJystat.errorfloatAuThe u band Galactic extinction (2)magphys.absorptionfloatcl[3/6] SDSS Morphology (6=point, 3=extended)src.class.starGalaxyintwL[0/1] Lacy wedge region flag (1=in, 0=out)meta.codeintwS[0/1] Stern wedge region flag (1=in, 0=out)meta.codeintwSm[0/1] Modified Stern wedge flag (1=in, 0=out)meta.codeintcl8[0/1] 8-D Bayesian classification (1=in, 0=out)meta.code.classintcl6[0/1] 6-D Bayesian classification (1=in, 0=out)meta.code.classintzph88-D photometric redshift (5)src.redshift.photfloate_zph8Lower limit on zph8stat.errorfloatE_zph8Upper limit on zph8stat.error;stat.maxfloatzpr88-D photometric redshift range probabilitystat.fit.goodnessfloatzph66-D photometric redshift (5)src.redshift.photfloate_zph6Lower limit on zph6stat.errorfloatE_zph6Upper limit on zph6stat.error;stat.maxfloatzpr66-D photometric redshift range probabilitystat.fit.goodnessfloatO[0/1] Optical selection flag (6)meta.codeintP-IDPrevious catalog identification with morphological type (G1)meta.code;src.morphcharP-zPrevious catalog object redshiftsrc.redshiftdoubleSloanDisplay the SDSS data for this quasarmeta.ref.urlcharDR6Details from the SDSS-DR6 photometry (Cat. II/282)meta.ref.urlcharJ/AJ/137/3884/table7XMM-Newton objects in the XFLS arearecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXNameName (XHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainExpXMM-Newton exposure timekstime.duration;obs.exposurefloatFtot? Total fluxmW.m**-2phot.flux;em.X-raydoublenullableScts? Soft-band counts (background corrected)ctphot.count;em.X-rayfloatnullableHcts? Hard-band counts (background corrected)ctphot.count;em.X-rayfloatnullableHR? Hardness ratiophot.flux;arith.ratiofloatnullablee_HR? Error in HRstat.errorfloatnullableSeq? Quasar catalog numbermeta.id.crossintnullableP-IDPrevious catalog identification with morphological type (G1)meta.code;src.morphcharP-z? Previous catalog object redshiftsrc.redshiftfloatnullable