J/ApJ/743/39ivo://CDS.VizieR/J/ApJ/743/39doi:10.26093/cds/vizier.17430039CDSRivera-Ingraham A.Martin P.G.Polychroni D.Moore T.J.T.2017-06-20T13:16:12Z2013-06-05T14:29:18ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-photometryyoung-stellar-objectsextinctiongalaxiesinfrared-sourcesIn this work, we have carried out an in-depth analysis of the young stellar content in the W3 giant molecular cloud (GMC). The young stellar object (YSO) population was identified and classified in the Infrared Array Camera/Multiband Imaging Photometer color-magnitude space according to the "Class" scheme and compared to other classifications based on intrinsic properties. Class 0/I and II candidates were also compared to low-/intermediate-mass pre-main-sequence (PMS) stars selected through their colors and magnitudes in the Two Micron All Sky Survey. We find that a reliable color/magnitude selection of low-mass PMS stars in the infrared requires prior knowledge of the protostar population, while intermediate-mass objects can be more reliably identified. By means of the minimum spanning tree algorithm and our YSO spatial distribution and age maps, we investigated the YSO groups and the star formation history in W3.2011ApJ...743...39Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/743/39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VI/128 : Log of CGPS exposures (Taylor+, 2003-)J/ApJS/196/18 : CO survey of galactic molecular clouds. II. (Bieging+, 2011)J/ApJ/733/113 : IRAC observations of IC 1795 (Roccatagliata+, 2011)J/ApJ/723/1019 : Galactic SFR and gas surface densities (Heiderman+, 2010)J/AJ/137/4072 : Infrared photometry of G216-2.5 YSOs (Megeath+, 2009)J/ApJ/682/445 : Spitzer observations of S254-S258 (Chavarria+, 2008)J/ApJ/688/1142 : Star formation in W5: Spitzer observations (Koenig+, 2008)J/AJ/136/2413 : Galactic midplane Spitzer red sources (Robitaille+, 2008)J/A+A/490/213 : 1.4 and 3.4mm interferometry of W3 IRS5 (Rodon+, 2008)J/ApJ/654/338 : Spitzer photometry in W3 molecular cloud (Ruch+, 2007)J/MNRAS/379/663 : 850um observations of W3 giant molecular cloud (Moore+, 2007)J/AJ/129/393 : UBV photometry in W3 (Oey+, 2005)J/A+AS/124/205 : W3 star-forming region 345 GHz survey (Helmich+ 1997)http://starformation-herschel.iap.fr/hobys/ : Star formation with Herschelhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/743/39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/743/39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/743/39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/743/39https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/743/39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/743/39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/743/39/yso (YSOs in W3: classifications and Spitzer photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/39/yso?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/39/yso?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/39/yso?GETtext/xml+votable180.050000true34.352208361.66840.005555555555555556Cone search capability for table J/ApJ/743/39/table3 (2MASS-based sample of pre-main sequence stars in W3)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/39/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/39/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/39/table3?GETtext/xml+votable180.050000true34.48961.39710.005555555555555556Cone search capability for table J/ApJ/743/39/table4 (Galaxy candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/39/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/39/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/39/table4?GETtext/xml+votable180.050000true34.320561.73730.005555555555555556Cone search capability for table J/ApJ/743/39/table15 (Individual parameters of groups in subregions of W3)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/39/table15?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/39/table15?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/39/table15?GETtext/xml+votable180.050000true36.263291762.1540.0055555555555555566/3307 3605 3648 3649 36506.772611666688002e-21 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/743/39?format=asciiInfrareddefaultJ/ApJ/743/39/ysoYSOs in W3: classifications and Spitzer photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[2] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[60/62] Degree of Declination (J2000)pos.eq.dec;meta.mainClass1Classification in Catalog 1 (G1)meta.code.class;src.class;meta.tablecharClass2Classification in Catalog 2 (G1)src.classcharq1[-1/1]? Reliability flag of Catalog 1 (G2)meta.code.qualintnullableq2[-1/1]? Reliability flag of Catalog 2 (G2)meta.code.qualintnullablegroupList the closest group(s)meta.ref.urlchar[3.6]Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]Error in [3.6]magstat.errorfloat[4.5]Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]Error in [4.5]magstat.errorfloat[5.8]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? Error in [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Error in [8.0]magstat.errorfloatnullable[24]? Spitzer/MIPS 24um band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24]? Error in [24]magstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/743/39/table32MASS-based sample of pre-main sequence stars in W3groupList the closest group(s)meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000; only for table 3)meta.id;meta.maincharRAJ2000[2] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[60/62] Degree of Declination (J2000)pos.eq.dec;meta.mainClass1Classification in Catalog 1 (G1)meta.code.class;src.class;meta.tablecharClass2Classification in Catalog 2 (G1)src.classcharq1[-1/1]? Reliability flag of Catalog 1 (G2)meta.code.qualintnullableq2[-1/1]? Reliability flag of Catalog 2 (G2)meta.code.qualintnullableSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/743/39/table4Galaxy candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[2] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[60/62] Degree of Declination (J2000)pos.eq.dec;meta.maincl1[0/1]? Classification in Catalog 1 (1=galaxy) (G1)meta.code.class;src.class;meta.tableintnullablecl2[1] Classification in Catalog 2 (1=galaxy) (G1)meta.code.class;src.class;meta.tableintJ/ApJ/743/39/table15Individual parameters of groups in subregions of W3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionRegion name (AFGL333, KR_140_FIELD, or W3_MAIN/OH)meta.id.parentcharRAJ2000[2] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[61/62] Degree of Declination (J2000)pos.eq.dec;meta.mainAreaRegion areapc**2phys.area;obs.fielddoubleb_AvMinimum value of Avmagphot.magfloatB_AvMaximum value of Avmagphot.magfloatAv[2.2/6.4] Mean V band extinctionmagphys.absorption;em.opt.VfloatMgas[20/4300] Gas masssolMassphys.massfloate_MgasError in MgassolMassstat.errorfloatSigma[32/95] Gas surface density {Sigma}_gas_solMass.pc**-2phot.flux.density.sbfloate_SigmaError in SigmasolMass.pc**-2stat.errorfloatb_YSOMinium YSO surface densitypc**-2phot.flux.density.sbfloatB_YSOMaximum YSO surface densitypc**-2phot.flux.density.sb;stat.maxfloatYSO[3/54] Mean YSO surface densitypc**-2src.densityfloate_YSOError in YSOpc**-2stat.errordoubleSFE[0/1] Star formation efficiency (assuming YSOs are solar-mass stars)stat.paramfloatb_DistMinimum neighbor distancepcpos.distance;stat.minfloatB_DistMaximum neighbor distancepcpos.distance;stat.maxfloatDist[0.07/0.34] Mean neighbor distancepcpos.distancefloate_DistError in Distpcstat.errordoublea[0.4/4.5] Ellipse semi-major axispcphys.angSize;srcfloata/b[1.02/3.33] Axis ratiophys.angSize;arith.ratiofloatN[10/252] Number of YSOs in groupmeta.numberintgr[0/10] Group designation in Regionmeta.id.part;meta.mainintgrIDUnique group designationmeta.id;meta.mainchar