J/MNRAS/386/1605ivo://CDS.VizieR/J/MNRAS/386/1605doi:10.26093/cds/vizier.73861605CDSMaddox N.Hewett P.C.Warren S.J.Croom S.M.2024-07-06T20:16:01Z2009-01-30T22:21:39ZCDS support team

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

cds-question@unistra.frsurveysquasarsinfrared-photometryvisible-astronomysloan-photometryThe largest K-band flux-limited sample of luminous quasars to date has been constructed from the UKIRT (UK Infrared Telescope) Infrared Deep Sky Survey (UKIDSS) Large Area Survey Early Data Release, covering an effective area of 12.8deg^2^. Exploiting the K-band excess (KX) of all quasars with respect to foreground stars, including quasars experiencing dust reddening and objects with non-standard spectral energy distributions (SEDs), a list of targets suitable for spectroscopic follow-up observations with the AAOmega multi-object spectrograph is constructed, resulting in more than 200 confirmed active galactic nuclei (AGN). KX selection successfully identifies as quasar candidates objects that are excluded from the Sloan Digital Sky Survey (SDSS) quasar selection algorithm due to their colours being consistent with the stellar locus in optical colour space (with the space density of the excluded objects agreeing well with results from existing completeness analyses). Nearly half of the KX-selected quasars with K<=17.0 at z<3 are too faint in the i band to have been targeted by the SDSS quasar selection algorithm, revealing a large population of quasars with red i-K colours.2008MNRAS.386.1605Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/386/1605CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/149 : Positions of high-redshift luminous quasars (Schneider+ 1992)J/A+A/353/77 : Luminous quasars variability + polarization (Teerikorpi+ 2000)J/MNRAS/372/425 : 2dF-SDSS Luminous Red Galaxy Survey, 2SLAQ (Cannon+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/386/1605https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/386/1605http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/386/1605https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/386/1605https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/386/1605http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/386/1605GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/386/1605/table5 (Catalogue of KX-selected, spectroscopically observed objects (Version of Sept 2007))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/386/1605/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/386/1605/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/386/1605/table5?GETtext/xml+votable180.050000true184.40582-0.20339190.0055555555555555565/6501 6506 6550 6553 6565 7868 6/25919 25960 25962-25963 26019 26028 26048 26175 26191 26195 26198 26204 26211 26217 26220 26224 26255 26266 26276-26277 26279 26288 31450-31452 31454 31461 31463 314762.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/386/1605?format=asciiOpticalInfrareddefaultJ/MNRAS/386/1605/table5Catalogue of KX-selected, spectroscopically observed objects (Version of Sept 2007)UClUKIDSS Class (1)src.class.starGalaxyintULASULAS designation (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharEDR[0-9] UKIDSS-EDR identification numbermeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintS/G[-1/1] SDSS Class: -1 = star, 1 = galmeta.code.classintumag? u SDSS PSF magnitude (2)magphot.mag;em.opt.Udoublenullablee_umag? u SDSS PSF magnitude errormagstat.error;phot.mag;em.opt.Ufloatnullablegmag? g SDSS PSF magnitude (2)magphot.mag;em.opt.Bfloatnullablee_gmag? g SDSS PSF magnitude errormagstat.error;phot.mag;em.opt.Bfloatnullablermag? r SDSS PSF magnitude (2)magphot.mag;em.opt.Rfloatnullablee_rmag? r SDSS PSF magnitude errormagstat.error;phot.mag;em.opt.Rfloatnullableimag? i SDSS PSF magnitude (2)magphot.mag;em.opt.Ifloatnullablee_imag? i SDSS PSF magnitude errormagstat.error;phot.mag;em.opt.Ifloatnullablezmag? z SDSS PSF magnitude (2)magphot.mag;em.opt.Ifloatnullablee_zmag? z SDSS PSF magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableYmag? Y (0.97-1.07um) UKIDSS AperMag3 magnitude (2)magphot.mag;em.opt.Ifloatnullablee_Ymag? Y UKIDSS AperMag3 magnitude errormagstat.error;phot.mag;em.opt.BfloatnullableJmag? J UKIDSS AperMag3 magnitude (2)magphot.mag;em.IR.Jfloatnullablee_Jmag? J UKIDSS AperMag3 magnitude errormagstat.error;phot.mag;em.IR.JfloatnullableHmag? H UKIDSS AperMag3 magnitude (2)magphot.mag;em.IR.Hfloatnullablee_Hmag? H UKIDSS AperMag3 magnitude errormagstat.error;phot.mag;em.IR.HfloatnullableKmag? K UKIDSS AperMag3 magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Kmag? K UKIDSS AperMag3 magnitude errormagstat.error;phot.mag;em.IR.KfloatnullableE(B-V)Extinction (3)magphot.color.excessfloatTypeObject Type (4)src.classcharq_Type[1/5] Confidence in identification, 5=best (5)meta.noteintzSpectroscopic Redshift (0.000 = Star, -99.999 = No redshift)src.redshiftfloatS/NSignal to noise ratio, computed between observed frame 6000-7000{AA}stat.snrfloatComComments (6)meta.notecharSDSSDisplay the SDSS-DR6 data for this sourcemeta.ref.urlcharRAJ2000Right ascension (J2000) in degreesdegpos.eq.ra;meta.mainDEJ2000Declination (J2000) in degreesdegpos.eq.dec;meta.main