J/ApJS/149/123ivo://CDS.VizieR/J/ApJS/149/123doi:10.26093/cds/vizier.21490123CDSSetia Gunawan D.Y.A.de Bruyn A.G.van der Hucht K.A.Williams P.M.2026-01-20T12:13:11Z2005-06-06T16:39:43ZCDS support team

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

cds-question@unistra.frstellar-associationsradio-sourcesWe present a radio continuum survey at 1400 and 350 MHz of a region of 2{deg}x2{deg} centered on the Cygnus OB2 association (d=1.7kpc), using the Westerbork Synthesis Radio Telescope (WSRT) with angular resolutions of, respectively, 13" and 55". The resulting 5{sigma} flux-density limits of, respectively, ~2mJy and ~10-15mJy are a significant improvement over previous surveys. We detected 210 discrete sources with sizes less than 1.9{theta}beam (beam size), 98 of which at both frequencies. We also detected 28 resolved sources (sizes>1.9{theta}beam) still having well-defined peak intensities. The observed spectral index {alpha}^1400^_350_ distribution and source count strongly suggest an excess of sources of Galactic origin in the direction of Cyg OB2.2003ApJS..149..123Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/149/123CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/241 : 2MASS second incremental releaseV/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)VIII/42 : Texas Survey of radio sources at 365MHz (Douglas+ 1996)J/ApJS/74/181 : Small-diameter radiosources catalogue (Zoonematkermani+, 1990)J/AJ/101/1408 : Massive stars in Cyg OB2. (Massey+ 1991)J/A+A/241/551 : Radio continuum in Cygnus X region (Wendker+ 1991)J/A+AS/111/407 : VI Cygni red + reddened stars (Parthasarathy+, 1995)J/ApJS/107/239 : 327 MHz survey of the galactic plane (Taylor+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/149/123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/149/123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/149/123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/149/123https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/149/123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/149/123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/149/123/table2 (Discrete 1400-MHz and 350-MHz sources in Cyg OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/149/123/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/149/123/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/149/123/table2?GETtext/xml+votable180.050000true306.830541740.41726390.0055555555555555565/3667 3673 6/14667 14682 14689 146912.3191243101133513e-25 9.276497240453405e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/149/123?format=asciiRadiodefaultJ/ApJS/149/123/table2Discrete 1400-MHz and 350-MHz sources in Cyg OB2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSBHWThe source sequence number (1)meta.id;meta.maincharprimaryIdsmeta.ref.urlcharS1400MHz? Flux density at 1400MHzmJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_S1400MHzThe 1{sigma} error in S1400MHz (2)mJystat.errorfloatSC1400MHz? Convolved flux density at 1400MHzmJyphot.flux.density;em.radio.750-1500MHzintnullablee_SC1400MHzThe 1{sigma} error in SC1400MHz (2)mJystat.errorintS350MHz? Flux density at 350MHzmJyphot.flux.density;em.radio.200-400MHzintnullablee_S350MHzThe 1{sigma} error in S350MHz (2)mJystat.errorintl_Sp+Index[:<>] Limit flag on Sp+Indexmeta.code.errorcharSp+Index? Spectral index (3)spect.indexfloatnullablef_Sp+Index[1/4] Flag on Sp+index (4)meta.codeintRAJ2000Hour of Right Ascension (J2000) (5)pos.eq.ra;meta.maine_RAJ2000Error in RAs (5)sstat.error;pos.eq.rafloatDEJ2000Degree of Declination (J2000) (5)pos.eq.dec;meta.maine_DEJ2000Error in DEs (5)arcsecstat.error;pos.eq.decfloatSize[1/4] Source size flag (6)meta.codeintJ/ApJS/149/123/table7*Sources identification.l_LRLimit flag on LRmeta.code.errorcharLR? Likelihood ratio (1)stat.likelihood;arith.ratiodoublenullableIDIdentification designation (2)meta.id.crosscharTypeSource typesrc.classcharn_IDFlux density or magnitude of ID (3)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSBHWThe source sequence numbermeta.id;meta.maincharSep? Source and identification angular separationarcsecmeta.id;pos.angDistancefloatnullablelambda? Normalized source number densityphys.densitydoublenullablenSep? Normalized separationpos.angDistancefloatnullable