J/A+AS/58/39ivo://CDS.VizieR/J/A+AS/58/39CDSWindhorst R.A.Kron R.G.Koo D.C.2012-11-13T12:49:39Z2004-06-03T22:50:50ZCDS support team

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

cds-question@unistra.frradio-sourcessurveysastronomical-object-identificationA deep multicolor optical identification program is presented for a complete sample of 302 radio sources that were observed with the Westerbork Synthesis Radio Telescope within 5.52{deg}^2^ down to S_1.4GHz_>~0.6mJy (5{sigma}). Optical identifications are made from multicolor prime focus plates taken with the Kitt Peak 4 meter telescope in the passbands U,J,F and N with approximate respective limiting magnitudes of ~23.3, 23.7, 22.7 and 21.1. The astrometry has systematic errors smaller than 0.2"-0.3", while the random errors are of order 0.4". The agreement between the radio and optical coordinate frames is on average better than 0.25". Identifications are based on positional coincidence using the likelihood ratio method. For 171 out of the 302 radio sources likely identifications are proposed with an a posteriori identification percentage of 53%, 14 expected spurious objects (or 5% of all radio sources), while not more than 4 identifications have been missed. The sample reliability is 92% and its completeness 98%. About 20% of the identifications are stellar objects, the remaining have extended images or are too faint to be classified. About 15% of the identifications appear in possible clusters. The identification statistics are roughly constant from field to field, except for the Hercules 2 field which has an unusually high identification fraction (74%). The identification fraction is presented as a function of 21 cm flux density and limiting magnitude, and amounts to 15% for 1<~S_1.4GHz_<~100mJy down to the Palomar Sky Survey limit and 29% down to the effective 48" Schmidt limit. For S_1.4_<~100mJy the identification fraction remains roughly constant with flux density, contrary to the prediction of higher fractions by some models for cosmological evolution. The magnitude distributions for galaxies plus objects of unknown type generally increase towards fainter magnitudes; the quasar magnitude distributions are also increasing but not as steeply as for the radio galaxies.1984A&AS...58...39Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/58/39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998)J/A+AS/58/1 : 1412 MHz catalogue of Westerbork survey (Windhorst+, 1984)J/A+A/35/393 : Westerbork Second Deep Survey (Katgert, 1974)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/58/39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/58/39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/58/39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/58/39https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/58/39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/58/39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/58/39/table1 (List of Mayall prime focus plates used)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/58/39/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/58/39/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/58/39/table1?GETtext/xml+votable180.050000true197.1574629.385840.005555555555555556Cone search capability for table J/A+AS/58/39/table4a (List of optical identifications in the complete sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/58/39/table4a?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/58/39/table4a?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/58/39/table4a?GETtext/xml+votable180.050000true196.710705729.25449330.005555555555555556Cone search capability for table J/A+AS/58/39/table4b (List of identifications NOT in a complete sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/58/39/table4b?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/58/39/table4b?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/58/39/table4b?GETtext/xml+votable180.050000true196.899323929.07861470.0055555555555555565/1629 4962 6/6495 6515 6521 7178 9707 9710 10049 10051-10052 10383 10392 10394 19671 19842https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/58/39?format=asciiRadiodefaultJ/A+AS/58/39/table1List of Mayall prime focus plates usedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField designationmeta.id;meta.maincharRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainMPFMayall prime focus plate numbermeta.id;instr.plateintEmulsEmulsioninstr.plate.emulsioncharFilterFiltermeta.id;instr.filtercharTexpExposition timemintime.duration;obs.exposureintHAHour angle (end exposure)pos.eq.hacharAirmassAirmass (mid-exposure)obs.airMassfloatSeeingSeeing (in {sigma}/")arcsecinstr.obsty.seeingfloatComComments/observers (1)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/A+AS/58/39/table4aList of optical identifications in the complete sampleNoteNotes (7)meta.notecharRNormalized position differencepos.angDistancefloatMorphMorphology (5)src.morphcharEnvEnvironment (6)meta.code.membercharq_IDIdentification code (8)meta.code.qualintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWSTBWesterbork designation (1)meta.id;meta.maincharprimarym_WSTB[*ABC] Multiplicity index on Name (2)meta.code.multipcharRA1950Right ascension (1950.0)pos.eq.ra;meta.mainDE1950Declination (1950.0)pos.eq.dec;meta.mainoRAAverage offset in right ascension (3)arcsecpos.eq.ra;arith.difffloatoDEAverage offset in declination (3)arcsecpos.eq.dec;arith.difffloatLRLikelihood ratiostat.likelihood;arith.ratiofloatIDIdentification type (4)src.classchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/A+AS/58/39/table4bList of identifications NOT in a complete samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWSTBWesterbork designation (1)meta.id;meta.maincharprimarym_WSTB[*ABC] Multiplicity index on Name (2)meta.code.multipcharRA1950Right ascension (1950.0)pos.eq.ra;meta.mainDE1950Declination (1950.0)pos.eq.dec;meta.mainoRAAverage offset in right ascension (3)arcsecpos.eq.ra;arith.difffloatoDEAverage offset in declination (3)arcsecpos.eq.dec;arith.difffloatRNormalized position differencepos.angDistancefloatLRLikelihood ratiostat.likelihood;arith.ratiofloatIDIdentification type (4)src.classcharMorphMorphology (5)src.morphcharEnvEnvironment (6)meta.code.membercharNoteNotes (7)meta.notecharq_IDIdentification code (8)meta.code.qualint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/A+AS/58/39/notesIndividual notesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWSTBWesterbork designationmeta.id;meta.maincharNoteText of the Note (1)meta.notechar