J/ApJ/673/78ivo://CDS.VizieR/J/ApJ/673/78doi:10.26093/cds/vizier.16730078CDSLenc E.Garrett M.A.Wucknitz O.Anderson J.M.Tingay S.J.2017-06-30T05:48:27Z2010-05-31T20:30:15ZCDS support team

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

cds-question@unistra.frradio-sourcesvery-long-baseline-interferometryWe report on the first wide-field, very long baseline interferometry (VLBI) survey at 90cm. The survey area consists of two overlapping 28deg^2^ fields centered on the quasar J0226+3421 and the gravitational lens B0218+357. A total of 618 sources were targeted in these fields, based on identifications from Westerbork Northern Sky Survey (WENSS) data. Of these sources, 272 had flux densities that, if unresolved, would fall above the sensitivity limit of the VLBI observations. A total of 27 sources were detected as far as 2{deg} from the phase center. The results of the survey suggest that at least 10% of moderately faint (S~100mJy) sources found at 90 cm contain compact components smaller than ~0.1"-0.3" and stronger than 10% of their total flux densities.2008ApJ...673...78Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/673/78CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/62 : The Westerbork Northern Sky Survey (WENSS) (Leiden, 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/673/78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/673/78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/673/78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/673/78https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/673/78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/673/78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/673/78/sources (Astrometry and photometry at 324 MHz for all targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/673/78/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/673/78/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/673/78/sources?GETtext/xml+votable180.050000true36.5422916734.358527780.0055555555555555565/238 580 581 582 588 6/958 959 2308 2309 2311 2317 2318 2319 2332 2333 2334 2341 2343 2356 2376https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/673/78?format=asciiRadiodefaultJ/ApJ/673/78/sourcesAstrometry and photometry at 324 MHz for all targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFldSimbad column added by the CDSobs.fieldcharAnn1Annulus from field center (lower bound)degphys.angSizefloatAnn2Annulus from field center (upper bound)degphys.angSizefloatWENSSWENSS source designation, BHHMM.m+DDMMAmeta.id;meta.maincharprimarym_WENSS[AB] Multiplicity index on WENSSmeta.code.multipcharn_WENSS[WV] W=WENSS target source, V=VLBI detectionmeta.notecharErrSimbad column added by the CDSmeta.ref.urlcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainSpeakPeak flux density per solid beam angle at 90cm (in mJy/beam)mJyphot.flux.density;em.radio.200-400MHzintSintIntegrated flux at 90cmmJyphot.flux.density;em.radio.200-400MHzintSI? Spectral index alpha estimated from the WENSS and NVSS integrated flux densities where availablespect.indexfloatnullableSpDetails of this radio source at several frequencies from SPECFIND (Vollmer et al., Cat. VIII/85)meta.ref.urlcharJ/ApJ/673/78/table4Source and image characteristics and astrometric errorsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWENSSWENSS designation (excepted 3C 84)meta.id;meta.maincharm_WENSSMultiplicity index on Sourcemeta.code.multipcharFld[1/2]? Field numbermeta.id;obs.fieldintnullableDpc? Distance of the source from the phase center of the observed fielddegpos.angDistancefloatnullableBeam1Beam sizemasphys.angSize;instr.beamintBeam2Beam sizemasphys.angSize;instr.beamintPA[-90/90] Beam position angledegpos.posAng;instr.beamintnoise1{sigma} residual noise after the source model has been subtracted from the image (mJy/beam)mJystat.fit.residual;instr.det.noise;meta.modelledfloatRefReference for positions (1)meta.ref;pos.framecharDEMeasured offset of the VLBI source peak from the position listed in referencearcsecpos.angDistance;stat.maxfloatthetaEPosition angle of the VLBI source peak in relation to the position listed in referencedegpos.posAng;stat.maxintdsMeasured offset of the VLBI source peak in relation to the position listed in reference in terms of the 1{sigma} astrometric precision {sigma}_p_pos.angDistancefloat