J/ApJ/714/L285ivo://CDS.VizieR/J/ApJ/714/L285doi:10.26093/cds/vizier.17149285CDSPovich M.S.Whitney B.A.2018-01-02T13:43:16Z2012-05-29T09:48:38ZCDS support team

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

cds-question@unistra.frmolecular-cloudsyoung-stellar-objectsinfrared-photometrystellar-massesThrough analysis of archival images and photometry from the Spitzer GLIMPSE and MIPSGAL surveys combined with Two Micron All Sky Survey and MSX data, we have identified 488 candidate young stellar objects (YSOs) in the giant molecular cloud M17 SWex, which extends ~50pc southwest from the prominent Galactic HII region M17. Our sample includes >200 YSOs with masses >3M_{sun}_ that will become B-type stars on the main sequence. Extrapolating over the stellar initial mass function (IMF), we find that M17 SWex contains >1.3x10^4^ young stars, representing a proto-OB association. The YSO mass function is significantly steeper than the Salpeter IMF, and early O stars are conspicuously absent from M17 SWex. Assuming M17 SWex will form an OB association with a Salpeter IMF, these results reveal the combined effects of (1) more rapid circumstellar disk evolution in more massive YSOs and (2) delayed onset of massive star formation.2010ApJ...714L.285Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/714/L285CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/696/1278 : The extended star-forming environment of M17 (Povich+, 2009)J/ApJ/672/398 : JHK' photometry of M17 silhouette object (Ito+, 2008)J/ApJS/169/353 : Chandra sources in M17 (Broos+, 2007)J/ApJ/644/990 : Sub-mm clumps at 450 and 850{mu}m in M17 (Reid+, 2006)http://irsa.ipac.caltech.edu/data/SPITZER/MIPSGAL/ : MIPSGAL data onlinehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/714/L285https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/714/L285http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/714/L285https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/714/L285https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/714/L285http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/714/L285GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/714/L285/table1 (Basic properties of candidate YSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/714/L285/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/714/L285/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/714/L285/table1?GETtext/xml+votable180.050000true274.30292194-17.289691110.0055555555555555566/29112 29113 291146.772611666688002e-21 1.000830682546041e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/714/L285?format=asciiInfrareddefaultJ/ApJ/714/L285/table1Basic properties of candidate YSOsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[PW2010]Catalog numbermeta.idintSSTGLMAGLIMPSE name (GLLL.llll+BB.bbbb; Cat. II/293)meta.id;meta.mainchar[24]? Spitzer/MIPS 24 micron band magnitude (1)magphot.flux.density;em.IR.15-30umfloatnullableq_[24]? Quality flag on [24], 1=ok (2)meta.code.qualintnullable<logLb>Mean log bolometric luminositylog(solLum)phys.luminosityfloate_<logLb>The 1{sigma} error in <logLb>log(solLum)stat.errorfloat<M*>Mean stellar masssolMassphys.massfloate_<M*>The 1{sigma} error in <M*>solMassstat.errorfloat<logMd>? Mean log envelope-accretion rate (3)log(solMass.yr**-1)phys.mass.lossfloatnullablee_<logMd>? The 1{sigma} in <logMd>log(solMass.yr**-1)stat.errorfloatnullableStage[0/IA ]Evolutionary stage (A=Ambiguous)src.classcharMSX?[X/ ] MSX detection; X = yesmeta.codechareIR?[X/ ] Excess 4.5 micron emission; X = yesmeta.codecharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from GLIMPSE catalog (right ascension part)degpos.eq.ra;meta.main_DEPositions from GLIMPSE catalog (declination part)degpos.eq.dec;meta.main