J/ApJS/264/35ivo://CDS.VizieR/J/ApJS/264/35doi:10.26093/cds/vizier.22640035CDSTakemura H.Nakamura F.Arce H.G.Schneider N.Ossenkopf-Okada V.,Kong S.Ishii S.Dobashi K.Shimoikura T.Sanhueza P.Tsukagoshi T.,Padoan P.Klessen R.S.Goldsmith P.F.Burkhart B.Lis D.C.,Sanchez-Monge A.Shimajiri Y.Kawabe R.2023-08-25T12:20:42Z2023-04-21T10:12:04ZCDS support team

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

cds-question@unistra.frco-line-emissionsurveysmolecular-cloudsinterstellar-mediumyoung-stellar-objectsstellar-massesThe mass distribution of dense cores is a potential key to understanding the process of star formation. Applying dendrogram analysis to the CARMA-NRO Orion C^18^O (J=1-0) data, we identify 2342 dense cores, about 22% of which have virial ratios smaller than 2 and can be classified as gravitationally bound cores. The derived core mass function (CMF) for bound starless cores that are not associate with protostars has a slope similar to Salpeter's initial mass function (IMF) for the mass range above 1M_{sun}_, with a peak at ~0.1M_{sun}_. We divide the cloud into four parts based on decl., OMC-1/2/3, OMC-4/5, L1641N/V380 Ori, and L1641C, and derive the CMFs in these regions. We find that starless cores with masses greater than 10M_{sun}_ exist only in OMC-1/2/3, whereas the CMFs in OMC-4/5, L1641N, and L1641C are truncated at around 5-10M_{sun}_. From the number ratio of bound starless cores and Class II objects in each subregion, the lifetime of bound starless cores is estimated to be 5-30 freefall times, consistent with previous studies for other regions. In addition, we discuss core growth by mass accretion from the surrounding cloud material to explain the coincidence of peak masses between IMFs and CMFs. The mass accretion rate required for doubling the core mass within a core lifetime is larger than that of Bondi-Hoyle accretion by a factor of order 2. This implies that more dynamical accretion processes are required to grow cores.2023ApJS..264...35Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/264/35CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/428/693 : Rosette Nebula & Maddalena Cloud structures (Williams+ 1994)J/ApJS/123/233 : Catalog of Optically selected cores (Lee+, 1999)J/A+A/462/L17 : Dense cores in interstellar molecular clouds (Alves+, 2007)J/ApJ/665/1194 : Dense cores in the Orion A cloud survey (Ikeda+, 2007)J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/ApJ/764/114 : BVRI photometry of stars in Orion A (Hsu+, 2013)J/A+A/564/A68 : Orion A GMC 13CO and C18O maps (Shimajiri+, 2014)J/A+A/584/A91 : Dense cores in Aquila from Herschel (Konyves+, 2015)J/ApJS/217/7 : Orion A dense cores based on 1.1mm & C18O (Shimajiri+, 2015)J/ApJS/224/5 : Herschel Orion Protostar Survey (HOPS): SEDs (Furlan+, 2016)J/A+A/587/A153 : VISION I. VISTA Orion A Survey (Meingast+, 2016)J/A+A/604/A6 : SgrB2 ALMA continuum & spectral index (Sanchez-Monge+, 2017)J/A+A/619/A106 : 3D shape of Orion A from Gaia DR2 (Grossschedl+, 2018)J/A+A/610/A77 : Orion Integral Filament ALMA+IRAM30m N2H+ (Hacar+, 2018)J/ApJ/862/105 : Core mass function across Gal. env. II. IRDCs (Liu+, 2018)J/ApJ/886/102 : ALMA obs. of 70um dark high-mass clumps (Sanhueza+, 2019)J/A+A/635/A2 : NGC6334 ALMA 87.6GHz cont. emission map (Sadaghiani+, 2020)J/ApJ/912/156 : Core kinematics in the Dragon IRDC from ALMA (Kong+, 2021)J/PASJ/73/487 : C18O cores in Orion A (Takemura+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/264/35https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/264/35http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/264/35https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/264/35https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/264/35http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/264/35GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/264/35/table9 (Physical properties of the starless C^18^O cores in Orion A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/264/35/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/264/35/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/264/35/table9?GETtext/xml+votable180.050000true84.25833-4.92750.0055555555555555566/21430-21431 21436-21437 21439 21482 22805 22848https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/264/35?format=asciiRadiodefaultJ/ApJS/264/35/table9Physical properties of the starless C^18^O cores in Orion ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/2342] Internal index identifiermeta.id;meta.mainintRAJ2000[5] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[4/6] Degree of Declination (J2000)pos.eq.dec;meta.mainVLSR[0.74/16.5] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatArea[172/13228] Area, Aarcsec**2phys.areaint2RCore[0.03/0.3] Core diameterpcphys.size.diameterfloatFWHM[0.1/1.1] Full-Width at Half-Maximumkm/sspect.line.widthfloatamaj[0.007/0.12] Semi-Major axispcphys.size.smajAxis;src.orbitalfloatbmin[0.004/0.051] Semi-Minor axispcphys.size.sminAxisfloatPA[-180/180] Position angledegpos.posAngfloatTPeak[2.7/18.4] Peak temperatureKphys.temperaturefloatTTot[269.5/42895] Total temperatureKphys.temperaturefloatMCore[0/72.21] Core masssolMassphys.massfloatMVir[0/8.3] Virial masssolMassphys.massfloatalpha[0/39.3] Virial ratio of a corephys.mass;arith.ratiofloatnCore[0/615.5] Core density10000cm**3phys.densityfloatStStarless core (1)meta.codecharRegionRegion identifier ("L1641C", "L1641N", "OMC-1/2/3" or "OMC-4/5")meta.id;obs.fieldchar