J/ApJ/675/49ivo://CDS.VizieR/J/ApJ/675/49doi:10.26093/cds/vizier.16750049CDSSiana B.Polletta M.D.C.Smith H.E.Lonsdale C.J.Gonzalez-Solares E.,Farrah D.Babbedge T.S.R.Rowan-Robinson M.Surace J.Shupe D.,Fang F.Franceschini A.Oliver S.2017-06-29T08:56:00Z2010-09-10T15:34:08ZCDS support team

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

cds-question@unistra.frquasarsredshiftedvisible-astronomysloan-photometrymillimeter-astronomyphotometrysubmillimeter-astronomyWe use a simple optical/infrared (IR) photometric selection of high-redshift QSOs that identifies a Lyman break in the optical photometry and requires a red IR color to distinguish QSOs from common interlopers. The search yields 100 z~3 (U-dropout) QSO candidates with 19<r'<22 over 11.7deg^2^ in the ELAIS-N1 (EN1) and ELAIS-N2 (EN2) fields of the Spitzer Wide-area Infrared Extragalactic (SWIRE) Legacy Survey. The z~3 selection is reliable, with spectroscopic follow-up of 10 candidates confirming that they are all QSOs at 2.83<z<3.44. We find that our z~4 (g'-dropout) sample suffers from both unreliability and incompleteness but present seven previously unidentified QSOs at 3.50<z<3.89.2008ApJ...675...49Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/675/49CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/675/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/675/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/675/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/675/49https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/675/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/675/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/675/49/qsos (Optical/IR photometry of the z~3 QSO candidates, including the 12 spectroscopically confirmed z~4 QSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/675/49/qsos?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/675/49/qsos?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/675/49/qsos?GETtext/xml+votable180.050000true239.7795455.057090.0055555555555555565/2538 6/6069 6077 9463 9469 9471 9634 9635 9640 9641 9643 10146 10147 10150 10156 10158 11520 115216.772611666688002e-21 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/675/49?format=asciiOpticalRadiodefaultJ/ApJ/675/49/qsosOptical/IR photometry of the z~3 QSO candidates, including the 12 spectroscopically confirmed z~4 QSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential number (1)meta.recordintn_SeqNote on the object (2)meta.notecharSWIRESWIRE name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharzsp? Spectroscopic redshiftsrc.redshiftfloatnullablen_zsp[s?] 's' = redshift from SDSSmeta.notecharUmag? U magnitude (Vega)magphot.mag;em.opt.Ufloatnullableu_Umag[)] ')' when U magnitude is 5{sigma} limitmeta.code.errorcharg'magg' magnitude (Vega) (4)magphot.mag;em.opt.Bfloatr'magr' magnitude (Vega) (4)magphot.mag;em.opt.Rfloati'mag? i' magnitude (Vega) (4)magphot.mag;em.opt.IfloatnullableZmag? Z magnitude (Vega) (4)magphot.mag;em.opt.IfloatnullableF3.6IRAC1 (3.6um) flux (5)uJyphot.mag;em.IR.3-4umintF4.5IRAC2 (4.5um) flux (5)uJyphot.mag;em.IR.4-8umintl_F5.8Limit flag on F5.8meta.code.errorcharF5.8IRAC3 (5.8um) flux (5)uJyphot.flux.density;em.IR.4-8umintl_F8.0Limit flag on F8.0meta.code.errorcharF8.0IRAC4 (8.0um) magnitude (5)uJyphot.flux.density;em.IR.8-15umintl_F24Limit flag on F24meta.code.errorcharF24MIPS24 (24um) fluxuJyphot.flux.density;em.IR.15-30umintRAJ2000Rigth ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainJ/ApJ/675/49/table3The broadband optical/IR template combined with the Telfer et al. (2002ApJ...565..773T)/ Vandenberk et al. (2001AJ....122..549V) composite spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength in micronsumem.wlfloatFluxNormalized flux at lambdaphot.flux;arith.ratiofloat