J/A+A/610/A27ivo://CDS.VizieR/J/A+A/610/A27doi:10.26093/cds/vizier.36100027CDSMedina S.-N.X.Dzib S.A.Tapia M.Rodriguez L.F.Loinard L.2020-06-02T15:01:17Z2018-06-05T11:02:27ZCDS support team

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

cds-question@unistra.frstar-forming-regionsradio-sourcesinfrared-photometryThe presence and properties of compact radio sources embedded in massive star forming regions can reveal important physical properties about these regions and the processes occurring within them. The NGC 6334 complex, a massive star forming region, has been studied extensively. Nevertheless, none of these studies has focused in its content in compact radio sources. Aims. Our goal here is to report on a systematic census of the compact radio sources toward NGC 6334, and their characteristics. This will be used to attempt to define their very nature. We used the VLA C band (4-8GHz) archive data with 0.36" (500AU) of spatial resolution and noise level of 50Jy/bm to carry out a systematic search for compact radio sources within NGC 6334. We also searched for infrared counterparts to provide some constraints on the nature of the detected radio sources. A total of 83 compact sources and three slightly resolved sources were detected. Most of them are here reported for the first time. We found that 29 of these 86 sources have infrared counterparts and three are highly variable. Region D contains 18 of these sources. The compact source toward the center, in projection, of region E is also detected. From statistical analyses, we suggest that the 83 reported compact sources are real and most of them are related to NGC 6334 itself. A stellar nature for 27 of them is confirmed by their IR emission. Compared with Orion, region D suffers a deficit of compact radio sources. The infrared nebulosities around two of the slightly resolved sources are suggested to be warm dust, and we argue that the associated radio sources trace free-free emission from ionized material. We confirm the thermal radio emission of the compact source in region E. However, its detection at infrared wavelengths implies that it is located in the foreground of the molecular cloud. Finally, three strongly variable sources are suggested to be magnetically active young stars.2018A&A...610A..27Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/610/A27CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/69/99 : NGC6334 centers of star formation JHK photometry (Straw+ 1989)J/A+A/316/102 : JHK Photometry in NGC 6334 (Tapia+, 1996)J/A+A/357/1020 : JHK photometry in NGC 6334 IV (Persi+, 2000)J/ApJ/707/1 : Water and Methanol masers in NGC 6334I(N) (Brogan+, 2009)J/A+A/587/A135 : Halpha images of NGC 6334 and NGC 6357 (Russeil+, 2016)J/A+A/592/A54 : Combined ArTeMiS+SPIRE 350um image of NGC6334 (Andre+, 2016)J/ApJ/778/96 : Spitzer and NEWFIRM observations of NGC 6334 (Willis+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/610/A27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/610/A27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/610/A27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/610/A27https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/610/A27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/610/A27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/610/A27/table1 (Infrared photometry for stellar counterparts of compact radio sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A27/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A27/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A27/table1?GETtext/xml+votable180.050000true260.1627917-35.82008330.005555555555555556Cone search capability for table J/A+A/610/A27/tablea1 (Radio properties of compact sources in NGC 6334)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A27/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A27/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A27/tablea1?GETtext/xml+votable180.050000true260.1592083-35.8130.005555555555555556Cone search capability for table J/A+A/610/A27/table2 (Infrared photometry around the region of cometary nebulae)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/610/A27/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/610/A27/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/610/A27/table2?GETtext/xml+votable180.050000true260.1746667-35.80130560.0055555555555555566/42456-424573.313034785154005e-24 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/610/A27?format=asciiInfraredRadiodefaultJ/A+A/610/A27/table1Infrared photometry for stellar counterparts of compact radio sourcesNotesNotes (G2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[DR] Note (G1)meta.notecharID[1/75] Identification numbermeta.idintJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullable_RAPositions from VLA name of table a1 (right ascension part)degpos.eq.ra;meta.main_DEPositions from VLA name of table a1 (declination part)degpos.eq.dec;meta.mainJ/A+A/610/A27/tablea1Radio properties of compact sources in NGC 6334recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhotindicates infrared photometry in table 1meta.ref.urlcharNote[RD] Note (G1)meta.notecharID[1/83] Identification numbermeta.idintprimaryVLAVLA name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharONameOther name (2)meta.idcharS6GHzFlux density at 6GHzuJyphot.flux.density;em.radio.3-6GHzinte_S6GHzrms uncertainty on S6GHzuJystat.errorintl_S5GHzLimit flag on S5GHz (3)meta.code.errorcharS5GHzFlux density at 5GHzuJyphot.flux.density;em.radio.3-6GHzinte_S5GHz? rms uncertainty on S5GHzuJystat.errorintnullablel_S7GHzLimit flag on S7GHz (3)meta.code.errorcharS7GHz? Flux density at 7GHzuJyphot.flux.density;em.radio.6-12GHzintnullablee_S7GHz? rms uncertainty on S7GHzuJystat.errorintnullablel_alphaLimit flag on alphameta.code.error;pos.eq.racharalpha? spectral index (S_{nu}_{prop.to}{nu}^alpha^)spect.indexfloatnullablee_alpha? rms uncertainty on alphastat.error;pos.eq.rafloatnullableS/NSignal-to-noise ratio obtained from the 6.0GHz mapstat.snrfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight ascension (derived from VLA) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from VLA) for Eq=J2000degpos.eq.dec;meta.mainJ/A+A/610/A27/table2Infrared photometry around the region of cometary nebulaeNote[ab] Note (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? rms uncertainty on [3.6]magstat.errorfloatnullable[4.5]? IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? rms uncertainty on [4.5]magstat.errorfloatnullable[5.8]? IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? rms uncertainty on [5.8]magstat.errorfloatnullable[8.0]? IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? rms uncertainty on [8.0]magstat.errorfloatnullableNotesNotes (G2)meta.notecharOtherOther namemeta.id;meta.mainchar