J/ApJ/644/990ivo://CDS.VizieR/J/ApJ/644/990doi:10.26093/cds/vizier.16440990CDSReid M.A.Wilson C.D.2017-11-10T11:16:43Z2007-11-30T22:53:58ZCDS support team

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

cds-question@unistra.frinterstellar-mediummillimeter-astronomysubmillimeter-astronomyWe have mapped a 5.5x5.5pc portion of the M17 massive star-forming region in both 850 and 450{mu}m dust continuum emission using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT). The maps reveal more than 100 dusty clumps with deconvolved linear sizes of ~0.05-0.2pc and masses of ~0.8-120M_{sun}_, most of which are not associated with known mid-infrared point sources. Fitting the clump mass function with a double power law gives a mean power-law exponent of {alpha}high=-2.4+/-0.3 for the high-mass power law, consistent with the exponent of the Salpeter stellar mass function. We show that a lognormal clump mass distribution with a peak at 4M_{sun}_ produces as good a fit to the clump mass function as does a double power law. This 4M_{sun}_ peak mass is well above the peak masses of both the stellar initial mass function and the mass function of clumps in low-mass star-forming regions. Despite the difference in intrinsic mass scale, the shape of the M17 clump mass function appears to be consistent with the shape of the core mass function in low-mass star-forming regions. Thus, we suggest that the clump mass function in high-mass star-forming regions may be a scaled up version of that in low-mass regions, instead of its extension to higher masses.2006ApJ...644..990Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/644/990CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/625/891 : Sub-mm clumps at 450 and 850{mu}m in NGC 7538 (Reid+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/644/990https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/644/990http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/644/990https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/644/990https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/644/990http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/644/990GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/644/990/table1 (Properties of the 850um Clumps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/644/990/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/644/990/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/644/990/table1?GETtext/xml+votable180.050000true275.0025-16.0050.005555555555555556Cone search capability for table J/ApJ/644/990/table2 (Properties of the 450um Clumps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/644/990/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/644/990/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/644/990/table2?GETtext/xml+votable180.050000true275.0125-16.0127780.0055555555555555566/29116 29118https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/644/990?format=asciiRadiodefaultJ/ApJ/644/990/table1Properties of the 850um ClumpsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSimbad column added by the CDSmeta.ref.urlchar[RW2006b]Name SNN NNN (1)meta.id;meta.maincharprimarym_[RW2006b][ABC] Multiplicity index for clump (1)meta.code.multipcharn_[RW2006b][e] Note on Name (2)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainReffEffective radiuspcphys.size.radiusfloatSpeakPeak flux density at 850um for table1 and 450um for table2, in Jy/beamJyphot.flux.density;em.mm.200-400GHzfloate_Speakrms uncertainty on Speak (3)Jystat.errorfloatSintIntegrated flux density at 850um for table1 and 450um for table2Jyphot.flux.density;em.mm.200-400GHzfloate_Sintrms uncertainty on Sint (3)Jystat.errorfloatalpha? Spectral index (only in table1) (4)spect.indexfloatnullableTd? Dust temperature (only in table1) (5)Kphys.temperatureintnullableM(30K)? Mass calculated with fixed Td (Td=30K)solMassphys.massfloatnullablee_M(30K)? rms uncertainty on M(30K) (3)solMassstat.errorfloatnullableM(Td)? Mass calculated with estimated Td (only in table1)solMassphys.massfloatnullablee_M(Td)? rms uncertainty on M(Td) (3) (only in table1)solMassstat.errorfloatnullableNpscNumber of MSX point sources contained within the clump's 0.5Speak contourmeta.numberintJ/ApJ/644/990/table2Properties of the 450um ClumpsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[RW2006b]Name SNN NNN (1)meta.id;meta.maincharm_[RW2006b][ABC] Multiplicity index for clump (1)meta.code.multipcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainReffEffective radiuspcphys.size.radiusfloatSpeakPeak flux density at 850um for table1 and 450um for table2, in Jy/beamJyphot.flux.density;em.mm.400-750GHzfloate_Speakrms uncertainty on Speak (3)Jystat.errorfloatSintIntegrated flux density at 850um for table1 and 450um for table2Jyphot.flux.density;em.mm.400-750GHzfloate_Sintrms uncertainty on Sint (3)Jystat.errorfloatalpha? Spectral index (only in table1) (4)spect.indexfloatnullableM(30K)? Mass calculated with fixed Td (Td=30K)solMassphys.massfloatnullablee_M(30K)? rms uncertainty on M(30K) (3)solMassstat.errorfloatnullableNpscNumber of MSX point sources contained within the clump's 0.5Speak contourmeta.numberint