J/ApJ/894/L14ivo://CDS.VizieR/J/ApJ/894/L14doi:10.26093/cds/vizier.18949014CDSLu X.Cheng Y.Ginsburg A.Longmore S.N.Kruijssen J.M.D.,Battersby C.Zhang Q.Walker D.L.2022-01-19T13:10:58Z2021-10-22T16:58:43ZCDS support team

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

cds-question@unistra.frgalactic-centerstar-forming-regionsmolecular-cloudsmillimeter-astronomysubmillimeter-astronomyWe report Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 continuum observations of 2000au resolution toward four massive molecular clouds in the Central Molecular Zone of the Galaxy. To study gas fragmentation, we use the dendrogram method to identify cores as traced by the dust continuum emission. The four clouds exhibit different fragmentation states at the observed resolution despite having similar masses at the cloud scale (~1-5pc). Assuming a constant dust temperature of 20K, we construct core mass functions of the clouds and find a slightly top-heavy shape as compared to the canonical initial mass function, but we note several significant uncertainties that may affect this result. The characteristic spatial separation between the cores as identified by the minimum spanning tree method, ~10^4^au, and the characteristic core mass, 1-7M_{sun}_, are consistent with predictions of thermal Jeans fragmentation. The three clouds showing fragmentation may be forming OB associations (stellar mass ~10^3^M_{sun}_). None of the four clouds under investigation seem to be currently able to form massive star clusters like the Arches and the Quintuplet (>~10^4^M_{sun}_), but they may form such clusters by further gas accretion onto the cores.2020ApJ...894L..14Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/894/L14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)J/ApJ/789/115 : The Quintuplet cluster astrometry & photometry (Stolte+, 2014)J/ApJ/853/171 : mm point sources in the extended Sgr B2 cloud (Ginsburg+, 2018)J/AJ/156/18 : Binary companions of evolved stars (Price-Whelan+, 2018)J/ApJ/862/105 : Core mass function across Gal. env. II. IR clumps (Liu+, 2018)J/ApJS/244/35 : VLA observations of the Central Molecular Zone (Lu+, 2019)J/ApJ/886/102 : ALMA obs. of 70um dark high-mass clumps (Sanhueza+, 2019)J/A+A/635/A2 : NGC6334 ALMA 87.6GHz continuum emission map (Sadaghiani+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/894/L14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/894/L14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/894/L14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/894/L14https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/894/L14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/894/L14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/894/L14/tableb1 (The full core catalog in the three clouds)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/894/L14/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/894/L14/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/894/L14/tableb1?GETtext/xml+votable180.050000true266.4017083-29.10833610.0055555555555555566/28827 28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/894/L14?format=asciiMillimeterdefaultJ/ApJ/894/L14/tableb1The full core catalog in the three cloudsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudCloud (1)meta.id.parentcharSeq[1/471] Core number within Cloudmeta.id.part;meta.mainintRAJ2000[17] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[28/29] Degree of Declination (J2000)pos.eq.dec;meta.mainRad[1028/8158] Radiusauphys.size.radiusintFlux[0.19/202] FluxmJyphot.flux.density;em.mm.200-400GHzfloatMass[0.29/304] Core masssolMassphys.massfloatn[2.8e+06/2.8e+08] Number densitycm**-3meta.number;phys.densitydouble