J/ApJ/862/105ivo://CDS.VizieR/J/ApJ/862/105doi:10.26093/cds/vizier.18620105CDSLiu M.Tan J.C.Cheng YuKong S.2021-02-23T11:45:23Z2019-08-29T11:26:48ZCDS support team

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

cds-question@unistra.frinterstellar-mediummillimeter-astronomysubmillimeter-astronomymolecular-cloudsWe study the core mass function (CMF) within 32 dense clumps in seven infrared dark clouds (IRDCs) with the Atacama Large Millimeter/submillimeter Array via 1.3mm continuum emission at a resolution of ~1". We have identified 107 cores with the dendrogram algorithm, with a median radius of about 0.02pc. Their masses range from 0.261 to 178M_{sun}_. After applying completeness corrections, we fit the combined IRDC CMF with a power law of the form dN/d.logM{propto}M^-{alpha}^ and derive an index of {alpha}~0.86+/-0.11 for M>=0.79M_{sun}_ and {alpha}~0.70+/-0.13 for M>=1.26M_{sun}_, which is a significantly more top-heavy distribution than the Salpeter stellar initial mass function index of 1.35. We also make a direct comparison of these IRDC clump CMF results to those measured in the more evolved protocluster G286 derived with similar methods, which have {alpha}~1.29+/-0.19 and 1.08+/-0.27 in these mass ranges, respectively. These results provide a hint that, especially for the M>=1.26M_{sun}_ range where completeness corrections are modest, the CMF in high pressure, early-stage environments of IRDC clumps may be top-heavy compared to that in the more evolved, global environment of the G286 protoclusters. However, larger samples of cores probing these different environments are needed to better establish the robustness of this potential CMF variation.2018ApJ...862..105Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/862/105CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)J/ApJ/428/693 : Rosette Nebula and Maddalena Cloud structures (Williams+ 1994)J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)J/A+A/462/L17 : Dense cores in interstellar molecular clouds (Alves+, 2007)J/ApJ/698/324 : Spitzer IRDCs (Ragan+, 2009)J/ApJS/208/14 : BGPS. IX. Data release 2. (Ginsburg+, 2013)J/A+A/584/A91 : Cat. of dense cores in Aquila from Herschel (Konyves+, 2015)J/A+A/606/A133 : IRDC G035.39-00.33 NH3 and CCS data cubes (Sokolov+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/862/105https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/862/105http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/862/105https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/862/105https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/862/105http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/862/105GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/862/105/table1 (Estimated physical parameters for 1.3mm continuum cores)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/862/105/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/862/105/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/862/105/table1?GETtext/xml+votable180.050000true276.5626407-12.69435030.0055555555555555566/29508 29510 30256 30258 30318 303191.528037907652962e-22 1.528037907652962e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/862/105?format=asciiMillimeterdefaultJ/ApJ/862/105/table1Estimated physical parameters for 1.3mm continuum coresrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource designation (<[LTC2018] ANcN> in Simbad)meta.id;meta.maincharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latDist[2.4/5.7] Distancekpcpos.distance;pos.heliocentricfloatIpk[1/197] I_peak_ flux density at 1.3mmmJy/beamphot.flux.density;em.mm.200-400GHzfloatSnu[0.5/233] Flux at 1.3mmmJyphot.flux.density;em.mm.200-400GHzfloatMass[0.1/178] Raw, uncorrected masssolMassphys.massfloatMc[0.2/178] Mass estimate after flux correction (1)solMassphys.massfloatRc[0.6/6.6] Core radius (2)0.01pcphys.size.radiusfloatSigc[0.2/24] Mass surface density of the core ({Sigma}_c_=M/A)g.cm**-2phys.densityfloatnHc[1/130] H nuclei number density in the core (3)1e+06cm**-3meta.idfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed