J/MNRAS/424/2876ivo://CDS.VizieR/J/MNRAS/424/2876doi:10.26093/cds/vizier.74242876CDSMaddox N.Hewett P.C.Peroux C.Nestor D.B.Wisotzki L.2024-07-18T20:18:58Z2013-08-19T15:48:39ZCDS support team

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

cds-question@unistra.frsurveysquasarsvisible-astronomysloan-photometryinfrared-photometryThe results of a large area, ~600deg^2^, K-band flux-limited spectroscopic survey for luminous quasars are presented. The survey utilizes the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) in regions of sky within the Sloan Digital Sky Survey (SDSS) footprint. The K-band excess (KX) of all quasars with respect to Galactic stars is exploited in combination with a photometric redshift/classification scheme to identify quasar candidates for spectroscopic follow-up observations. The data contained within this investigation will be able to provide new constraints on the fraction of luminous quasars reddened by dust with E(B-V)<=0.5mag. The spectroscopic sample is defined using the K-band, 14.0<=K<=16.6, and SDSS i-band limits of i=19.5, 19.7 and 22.0 over sky areas of 287, 150 and 196deg^2^, respectively. The survey includes >3200 known quasars from the SDSS and more than 250 additional confirmed quasars from the KX selection. A well-defined subsample of quasars in the redshift interval 1.0<=z<=3.5 includes 1152 objects from the SDSS and 172 additional KX-selected quasars. The quasar selection is >95 per cent complete with respect to known SDSS quasars and >95 per cent efficient, largely independent of redshift and i-band magnitude. The properties of the new KX-selected quasars confirm the known redshift-dependent effectiveness of the SDSS quasar selection and provide a sample of luminous quasars experiencing intermediate levels of extinction by dust. The catalogue represents an important step towards the assembly of a well-defined sample of luminous quasars that may be used to investigate the properties of quasars experiencing intermediate levels of dust extinction within their host galaxies or due intervening absorption line systems.2012MNRAS.424.2876Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/424/2876CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)VII/241 : The 2dF QSO Redshift Survey (2QZ) (Croom+ 2004)J/MNRAS/328/150 : KX redshift survey (Croom+, 2001)J/MNRAS/392/19 : The 2dF-SDSS QSO survey (2SLAQ) (Croom+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/424/2876https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/424/2876http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/424/2876https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/424/2876https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/424/2876http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/424/2876GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/424/2876/table4 (*KX-selected object catalogue, containing 324 objects from Large Area KX Survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/424/2876/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/424/2876/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/424/2876/table4?GETtext/xml+votable180.050000true237.0010.8260270.005555555555555556Cone search capability for table J/MNRAS/424/2876/table6 (KX-selected quasar catalogue, containing 4829 objects from Large Area KX Survey, SDSS, 2SLAQ and Pilot KX Survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/424/2876/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/424/2876/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/424/2876/table6?GETtext/xml+votable180.050000true236.63730.9324340.0055555555555555564/518 521-523 1647 1967 5/136 2052 2061-2065 2067-2068 2070 2076 2078 2083 2096 2098 2176 2178 4351 4438 4441-4442 4453-4454 4457-4458 4475 4501-4502 4505-4506 4517-4518 4521-4522 4575 4595-4598 4601-4602 4693-4694 4697-4698 4709-4710 4713-4715 4733-4734 4756-4758 4761-4762 4897-4898 4917-4918 4921-4922 4933-4934 4937-4938 4997-5001 6486 6489-6490 6505 6525 6527 6549 6553 6565 6583 6585-6587 6607 6611-6612 6614-6618 6628 6630 6632-6633 6741-6742 6745 6918 6927-6929 6931-6932 6934 6936-6938 7823 7842 7855 7857 7859 7867 7914 11261 6/0 2 37-39 41-44 46 48 50 128-129 521-524 526-527 548-550 552-554 640 8212 8222-8223 8237 8239 8241-8243 8264-8266 8276-8278 8284 8325-8327 8329-8331 8388-8390 8396 8398 8416-8418 8448-8450 8708-8710 8716 8718 8721 8724 8736-8737 17661-17663 17725-17727 17743 17745-17748 17751 17756-17757 17761-17763 17772-17774 17776-17778 17805-17807 17810-17811 17820-17822 17826-17827 17836-17838 17840-17842 17856-17858 17860 17877-17879 17883-17886 17895 17906-17907 17912 17981-17983 17997-17999 18001-18003 18012-18013 18017-18019 18028 18032 18063 18065-18067 18076 18081 18083 18092-18094 18096-18098 18112 18176-18178 18243-18244 18246 18249-18252 18295 18299 18365 18367 18396-18398 18401-18403 18412-18414 18416-18418 18686-18687 18749-18751 18765-18767 18769-18771 18780-18782 18785-18787 18796-18798 18800-18802 18804 18829-18831 18833-18835 18844-18846 18850-18851 18864-18866 18880-18882 18909-18911 18925-18927 18929-18931 18940-18942 19005-19007 19021-19023 19036-19038 19041-19043 19052-19054 19056-19058 19092-19093 19137 19200-19202 19269 19271 19280-19282 19456-19458 19464 19502-19503 19505 19507 19510 19512-19514 19582-19583 19585-19587 19596-19598 19600 19616-19618 19647 19663 19665 19667 19676 19678 19681-19683 19692 19696-19698 19727 19731 19740 19745 19747 19756-19757 19760-19761 19776-19777 19780 19840 19979 19981-19983 19985 19987 20016 20018 20032-20034 25599 25855 25955 25964 25968 25999 26003-26006 26009-26010 26012 26019 26025-26026 26028 26032 26048 26105-26107 26175 26191 26200-26202 26204 26211 26217-26218 26220 26224 26255 26264 26266-26267 26277 26301-26303 26317 26319 26326-26327 26329-26331 26337-26339 26368 26423 26427 26439 26453-26455 26476 26480 26485 26487 26503-26504 26506-26509 26511 26517-26519 26524 26536-26538 26544 26963 26979 26985 26988 26992 27648 27661 27663 27665-27670 27678 27685 27696 27699 27701-27703 27705 27721-27723 27732-27734 27760 27796-27798 27840 27904 31287 31330 31336 31342 31392 31400 31402 31419 31424-31426 31442 31448 31451 31454-31455 31463 31467 31648 31650-31651 36862-36863 45023 45053 45055https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/424/2876?format=asciiOpticalInfrareddefaultJ/MNRAS/424/2876/table4*KX-selected object catalogue, containing 324 objects from Large Area KX Surveyzsp? Spectroscopic redshiftsrc.redshiftdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintc[qgsu] KX Catalogue ID (G1)meta.id;meta.datasetcharKXUnique KX Catalogue ID (G1)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainumagSDSS u-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Ufloate_umagSDSS u-band magnitude errormagstat.error;phot.mag;em.opt.UfloatgmagSDSS g-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Bfloate_gmagSDSS g-band magnitude errormagstat.error;phot.mag;em.opt.BfloatrmagSDSS r-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Rfloate_rmagSDSS r-band magnitude errormagstat.error;phot.mag;em.opt.RfloatimagSDSS i-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Ifloate_imagSDSS i-band magnitude errormagstat.error;phot.mag;em.opt.IfloatzmagSDSS z-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Ifloate_zmagSDSS z-band magnitude errormagstat.error;phot.mag;em.opt.IfloatYmagUKIDSS Y-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Jfloate_YmagUKIDSS Y-band magnitude errormagstat.error;phot.mag;em.opt.BfloatJmagUKIDSS J-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Jfloate_JmagUKIDSS J-band magnitude errormagstat.error;phot.mag;em.IR.JfloatHmagUKIDSS H-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Hfloate_HmagUKIDSS H-band magnitude errormagstat.error;phot.mag;em.IR.HfloatKmagUKIDSS K-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Kfloate_KmagUKIDSS K-band magnitude errormagstat.error;phot.mag;em.IR.KfloatReg[1/3] Region flag (G2)meta.idintzphNear-IR photo-z photometric redshiftsrc.redshiftdoubleCl[1/5] Classification of source (3)meta.code.classintq_Cl[1/3] Confidence of classification, 1=good (4)meta.code.qualintLineIDIdentified spectral feature (6)spect.indexcharSDSSSDSS Object ID, objIDmeta.idUKIDSSUKIDSS WSA Object IDmeta.idComTentative identification (5)meta.code.classcharSloanDisplay the SDSS data for this objectmeta.ref.urlcharJ/MNRAS/424/2876/table6KX-selected quasar catalogue, containing 4829 objects from Large Area KX Survey, SDSS, 2SLAQ and Pilot KX SurveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintc[q_] KX Catalogue ID (G1)meta.id;meta.datasetcharKXUnique KX Catalogue ID (G1)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainumagSDSS u-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Ufloate_umagSDSS u-band magnitude errormagstat.error;phot.mag;em.opt.UfloatgmagSDSS g-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Bfloate_gmagSDSS g-band magnitude errormagstat.error;phot.mag;em.opt.BfloatrmagSDSS r-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Rfloate_rmagSDSS r-band magnitude errormagstat.error;phot.mag;em.opt.RfloatimagSDSS i-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Ifloate_imagSDSS i-band magnitude errormagstat.error;phot.mag;em.opt.IfloatzmagSDSS z-band magnitude, converted to Vega, corrected for Galactic extinctionmagphot.mag;em.opt.Ifloate_zmagSDSS z-band magnitude errormagstat.error;phot.mag;em.opt.IfloatYmagUKIDSS Y-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Jfloate_YmagUKIDSS Y-band magnitude errormagstat.error;phot.mag;em.opt.BfloatJmagUKIDSS J-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Jfloate_JmagUKIDSS J-band magnitude errormagstat.error;phot.mag;em.IR.JfloatHmagUKIDSS H-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Hfloate_HmagUKIDSS H-band magnitude errormagstat.error;phot.mag;em.IR.HfloatKmagUKIDSS K-band magnitude, corrected for Galactic extinctionmagphot.mag;em.IR.Kfloate_KmagUKIDSS K-band magnitude errormagstat.error;phot.mag;em.IR.KfloatReg[1/3] Region flag (G2)meta.idintr_z[1/6] Source of classification (3)meta.ref;pos.frameintzRedshift (spectroscopic for Source 1/5, photometric for Source=6)src.redshiftdoublezphNear-IR photo-z photometric redshiftsrc.redshiftfloatC[1/2] Completeness flag (4)meta.codeintE(B-V)Estimated reddeningmagphot.color.excessfloatQSO[0/4] BALQSO flag (5)meta.codeintSDSSSDSS Object ID, objIDmeta.idUKIDSSUKIDSS WSA Object IDmeta.idSpObjIDSDSS spectroscipic ID; "KX" if not in SDSSmeta.idcharSloanDisplay the SDSS data for this objectmeta.ref.urlchar