J/ApJS/219/41ivo://CDS.VizieR/J/ApJS/219/41doi:10.26093/cds/vizier.22190041CDSMontes V.A.Hofner P.Anderson C.Rosero V.2017-01-23T22:00:00Z2016-01-18T11:28:51ZCDS support team

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

cds-question@unistra.frx-ray-sourcesastronomical-object-identificationinfrared-photometryradio-continuum-emissionWe present results from Chandra ACIS-I and Karl G. Jansky Very Large Array 6cm continuum observations of the IRAS 20126+4104 massive star-forming region. We detect 150 X-ray sources within the 17'x17' ACIS-I field, and a total of 13 radio sources within the 9.2' primary beam at 4.9GHz. Among these observations are the first 6cm detections of the central sources reported by Hofner et al. (2007A&A...465..197H), namely, I20N1, I20S, and I20var. A new variable radio source is also reported. Searching the 2MASS archive, we identified 88 near-infrared (NIR) counterparts to the X-ray sources. Only four of the X-ray sources had 6cm counterparts. Based on an NIR color-color analysis and on the Besancon simulation of Galactic stellar populations, we estimate that approximately 80 X-ray sources are associated with this massive star-forming region. We detect an increasing surface density of X-ray sources toward the massive protostar and infer the presence of a cluster of at least 43 young stellar objects within a distance of 1.2pc from the massive protostar.2015ApJS..219...41Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/219/41CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)J/ApJ/685/1005 : Spitzer and high-mass star forming regions (Qiu+, 2008)J/ApJS/168/100 : X-ray study of star-forming region NGC 6357 (Wang+, 2007)J/ApJS/163/306 : Chandra study of the Cep B star-forming region (Getman+, 2006)J/ApJS/160/353 : Membership of the Orion nebula population (Getman+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/219/41https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/219/41http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/219/41https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/219/41https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/219/41http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/219/41GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/219/41/table1 (Observed X-ray properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/219/41/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/219/41/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/219/41/table1?GETtext/xml+votable180.050000true303.446162541.26146940.005555555555555556Cone search capability for table J/ApJS/219/41/table4 (Radio sources in the 6cm continuum band)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/219/41/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/219/41/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/219/41/table4?GETtext/xml+votable180.050000true303.60762541.22663890.0055555555555555566/146553.313034785154005e-24 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/219/41?format=asciiX-rayInfraredRadiodefaultJ/ApJS/219/41/table5Multi-wavelength counterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/149] Sequence number \linkRole{X-ray properties}meta.idintCXOCXO name (HHMMSS.s+DDMMSS.s; J2000)meta.id;meta.mainchar2MASS2MASS name (HHMMSS.ss+DDMMSS.s; J2000)meta.id.crosscharf_2MASS[a-ce-g] Flag on 2MASS (1)meta.codecharSSTSLPSSTSLP name (HHMMSS.ss+DDMMSS.s; J2000)meta.id.crosscharf_SSTSLP[d] Flag on SSTSLP (1)meta.codecharVLAVLA name (GLL.llll+B.bbbb)meta.id.crosscharUSNO-B1.0USNO-B1 namemeta.id.crosscharJmag[8.1/17.9]? 2MASS J-band magnitudemagphot.mag;em.IR.JfloatnullableHmag[7.8/17.4]? 2MASS H-band magnitudemagphot.mag;em.IR.HfloatnullableKsmag[7.7/16.1]? 2MASS Ks-band magnitudemagphot.mag;em.IR.KfloatnullableJ/ApJS/219/41/table1Observed X-ray propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/150] Running sequence numbermeta.idintprimaryCDisplay the counterpart(s) of this source if anymeta.ref.urlintnullableCXOCXO name (HHMMSS.s+DDMMSS.s; J2000)meta.id;meta.maincharRAs[0.4/59.3] Second of right ascension (J2000) with higher precisionspos.eq.ra;arith.diffDEs[0.8/60] Arcsecond of declination (J2000) with higher precisionarcsecpos.eq.dec;arith.diffCR[0.2/9.9] Observed count ratect/ksphot.count;em.X-rayfloatFx[0.1/13]? Observed X-ray flux; 10^-14^erg/cm^2^/s (1)1e-17W.m**-2phot.flux;em.X-rayfloatnullableHR? Hardness ratio (2)phot.flux;arith.ratiofloatnullableClVariability classification (V: variable; FL: flaring; or constant if left blank)meta.code;src.varchar_RAPositions from CXO names with second/arcsecond columns (right ascension part)degpos.eq.ra;meta.main_DEPositions from CXO names with second/arcsecond columns (declination part)degpos.eq.dec;meta.mainJ/ApJS/219/41/table4Radio sources in the 6cm continuum bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVLARadio source designation (GLL.llll+B.bbb)meta.id;spect.dopplerVeloc.radio;em.radiocharf_VLAFlag on VLA (1)meta.codecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainrms[6/27.1] rmsuJystat.errorfloatSnu[42.4/1682] 6cm flux densityuJyphot.flux.density;em.radio.3-6GHzfloatH07Radio source in Hofner et al. 2007A&A...465..197H (2) \linkRole{SIMBAD object}meta.id.crosscharRadRadio source in Anderson et al. 2011AJ....142..158A (2)meta.id.crosscharSeq[30/50]? X-ray counterpartmeta.id.crossintnullable