J/ApJ/883/156ivo://CDS.VizieR/J/ApJ/883/156doi:10.26093/cds/vizier.18830156CDSTakekoshi T.Fujita S.Nishimura A.Taniguchi K.Yamagishi M.,Matsuo M.Ohashi S.Tokuda K.Minamidani T.2022-11-08T07:22:48Z2021-03-31T14:16:28ZCDS support team

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

cds-question@unistra.frco-line-emissioninterstellar-mediumsurveysmolecular-physicsWe report the statistical physical properties of the C^18^O(J=1-0) clumps present in a prominent cluster-forming region, Cygnus X, using the data set obtained by the Nobeyama 45m radio telescope. This survey covers 9deg^2^ of the northern and southern regions of Cygnus X, and, in total, 174 C^18^O clumps are identified using the dendrogram method. Assuming a distance of 1.4kpc, these clumps have radii of 0.2-1pc, velocity dispersions of <2.2km/s, gas masses of 30-3000M_{sun}_, and H_2_ densities of (0.2-5.5)x10^4^cm^-3^. We confirm that the C^18^O clumps in the northern region have a higher H_2_ density than those in the southern region, supporting the existence of a difference in the evolutionary stages, consistent with the star-formation activity of these regions. The difference in the clump properties of the star-forming and starless clumps is also confirmed by the radius, velocity dispersion, gas mass, and H_2_ density. The average virial ratio of 0.3 supports that these clumps are gravitationally bound. The C^18^O clump mass function shows two spectral index components, {alpha}=-1.4 in 55-140M_{sun}_ and {alpha}=-2.1 in >140M_{sun}_, which are consistent with the low- and intermediate-mass parts of the Kroupa's initial mass function. The spectral index of the star-forming clumps >140M_{sun}_ is consistent with that of the starless clumps ranging from 55-140M_{sun}_, suggesting that the latter will evolve into star-forming clumps while retaining the gas accretion. Assuming a typical star-formation efficiency of molecular clumps (10%), about 10 C^18^O clumps having a gas mass of >10^3^M_{sun}_ will evolve into open clusters containing one or more OB stars.2019ApJ...883..156Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/883/156CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/638/293 : 1.1mm sources in the Perseus Molecular Cloud (Enoch+, 2006)J/A+A/462/L17 : Dense cores in interstellar molecular clouds (Alves+, 2007)J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007)J/ApJ/732/101 : C^18^O cores in the S140 cloud (Ikeda+, 2011)J/AJ/148/11 : Infrared photometry in Cygnus-X (Kryukova+, 2014)J/ApJS/217/7 : Orion A dense cores based on 1.1mm & C^18^O (Shimajiri+, 2015)J/MNRAS/449/741 : The massive star population of Cygnus OB2 (Wright+, 2015)J/A+A/592/A54 : Combined ArTeMiS+SPIRE 350um image of NGC6334 (Andre+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/883/156https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/883/156http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/883/156https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/883/156https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/883/156http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/883/156GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/883/156/table1 (C^18^O core catalog of the Cygnus-X survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/883/156/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/883/156/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/883/156/table1?GETtext/xml+votable180.050000true308.60831541.5031410.0055555555555555566/14664-14665 14667-14668 14670-14671 14680 14682-14683 14689 14692-14693 14704 14706https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/883/156?format=asciiRadiodefaultJ/ApJ/883/156/table1C^18^O core catalog of the Cygnus-X surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/174] Sequential object identifiermeta.id;meta.mainintGLON[77.4/82.3] Peak galactic longitude, decimal degreesdegpos.galactic.lonGLAT[-1.4/1.7] Peak galactic latitude, decimal degreesdegpos.galactic.latVpk[-30.2/16.2] Peak velocitykm/sphys.veloc;stat.maxfloatTC18O[1.7/4.5] Peak C^18^O main beam temperatureKphys.temperature;meta.main;stat.maxfloate_TC18O[0.3/0.7] Uncertainty in TC18OKstat.errorfloatT12CO[5.7/40.7] Peak ^12^CO main beam temperatureKspect.line.intensity;meta.main;stat.maxfloate_T12CO[1.17/6.2] Uncertainty in T12COKstat.errorfloatIC18O[0.12/7.1] C^18^O integrated intensity, K.pc2/km/sK.pc**2.km.s**-1spect.line.intensityfloatSimbadSimbad 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.decnullableindexedRcl[0.23/1.43] Core radiuspcphys.size.radiusfloate_IC18O[0.013/0.71] Uncertainty in IC180K.pc**2.km.s**-1stat.errorfloatMlte[0.3/35.1] LTE mass100solMassphys.massfloatnH2[0.2/5.6] Mean density, hydrogen molecule10000cm**-3phys.density;stat.meanfloatdvcl[0.01/2.2] Intensity-weighted velocity FWHMkm/sspect.line.widthfloatMvir[0.01/7.4] Virial mass100solMassphys.massfloatSF?[Y ] Protostarmeta.codecharRegionRegionmeta.notecharEdge?[Y ] Map edge?meta.codechar