J/ApJ/649/63ivo://CDS.VizieR/J/ApJ/649/63doi:10.26093/cds/vizier.16490063CDSSchmidt S.J.Connolly A.J.Hopkins A.M.2008-10-18T22:00:33Z2008-10-18T21:55:46ZCDS support team

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

cds-question@unistra.frsurveysradio-galaxiesinfrared-sourcesWe present the first results from the Distant Radio Galaxies Optically Non-detected in the SDSS (DRaGONS) survey. Using a novel selection technique for identifying high-redshift radio galaxy (HzRG) candidates, a large sample is compiled using bright (S_1.4GHz_>100mJy) radio sources from the FIRST survey having no optical counterpart in the SDSS. Near-IR K-band imaging for 96 targets allows preliminary identification of HzRG candidates through the well-known K-z relation, for subsequent spectroscopic observation. We measure magnitudes brighter than K~19.5 for 70 of the 96, and limiting magnitudes for the remainder. Redshifts based on a linear fit to the K-z diagram give a mean <z>=2.5 and median z=2.0, showing that this method should be efficient at identifying a large number of HzRGs.2006ApJ...649...63Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/649/63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/649/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/649/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/649/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/649/63https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/649/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/649/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/649/63/table1 (Detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/649/63/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/649/63/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/649/63/table1?GETtext/xml+votable180.050000true115.5567083332.947544440.005555555555555556Cone search capability for table J/ApJ/649/63/table2 (Non-detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/649/63/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/649/63/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/649/63/table2?GETtext/xml+votable180.050000true155.504291673.960433330.0055555555555555566/6266 7308 8192 9286 9303 9342 9413 9431 9471 9472 9605 9626 9638 9639 9642 9644 9793 9826 9908 9909 9935 9939 9942 9944 9957 9972 9991 10022 10030 10112 10123 10989 11225 11346 11362 11381 11412 11472 11480 11502 11804 11908 17328 18519 18535 18541 18583 18632 18688 25943 25966 25971 26013 26014 26046 26050 26055 26071 26082 26191 26203 26215 26260 26268 26269 26271 26300 26333 26369 26371 26372 26402 26414 26999 27064 27102 27104 27330 27345 27395 27421 27425 27659 27673 27778 31333 31336 31339 31375 31464 32445 32484 49093 49102https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/649/63?format=asciiInfraredRadiodefaultJ/ApJ/649/63/table1DetectionsDRaGONSObject Name (JHHMM+DDMM)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_DRaGONS[abc] Multiplicity index on DRaGONS (G1)meta.code.multipcharn_DRaGONS[c-g] Note on DRaGONS (1)meta.notecharDateObservation Datetime.epoch;obsnullablen_DateSecond day of observationmeta.notecharRAJ2000? Radio right ascension (J2000) (G2)pos.eq.ra;meta.mainnullableDEJ2000? Radio declination (J2000) (G2)pos.eq.dec;meta.mainnullableExt?[YN] Extended source ? (G3)meta.codecharFpeak? Peak 1.4GHz flux density from the FIRST (VIII/71) catalogmJyphot.flux.density;em.radio.750-1500MHzfloatnullableFint? Integrated 1.4GHz flux density from the FIRST (VIII/71) catalogmJyphot.flux.density;em.radio.750-1500MHzfloatnullablel_KmagLimit flag on Kmagmeta.code.errorcharKmag? Apparent K magnitude for the infrared object (G4)magphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmag (2)magstat.error;phot.mag;em.IR.KfloatnullableSeeing? FWHM seeing measured for the field, for radio observationsarcsecinstr.obsty.seeingfloatnullablel_zLimit flag on zmeta.code.error;src.redshiftcharz? Estimated redshift, for radio observations (3)src.redshiftfloatnullableFIRSTDisplay the FIRST data (from Cat. VIII/71)meta.ref.urlcharRAI? Infrared right ascension (J2000)pos.eq.ranullableDEI? Infrared declination (J2000)pos.eq.decnullableJ/ApJ/649/63/table2Non-detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDRaGONSObject Namemeta.id;meta.maincharm_DRaGONS[abc] Multiplicity index on DRaGONS (G1)meta.code.multipcharn_DRaGONS[h-i] Note on DRaGONS (1)meta.notecharDateObservation Datetime.epoch;obscharRAJ2000? Radio right ascension (J2000) (G2)pos.eq.ra;meta.mainnullableDEJ2000? Radio declination (J2000) (G2)pos.eq.dec;meta.mainnullableExt?[YN] Extended source ? (G3)meta.codecharFpeak? Peak 1.4GHz flux density from the FIRST (VIII/71) catalogmJyphot.flux.density;em.radio.750-1500MHzfloatnullableFint? Integrated 1.4GHz flux density from the FIRST (VIII/71) catalogmJyphot.flux.density;em.radio.750-1500MHzfloatnullablel_KmagLimit flag on Kmagmeta.code.errorcharKmag? 2{sigma} limit K magnitude for the infrared object (G4)magphot.mag;em.IR.KfloatnullableSeeing? FWHM seeing measured for the field, for radio observationsarcsecinstr.obsty.seeingfloatnullablel_zLimit flag on zmeta.code.error;src.redshiftcharz? Estimated redshift, for radio observations (2)src.redshiftfloatnullableFIRSTDisplay the FIRST data (from Cat. VIII/71)meta.ref.urlchar