J/ApJ/949/63ivo://CDS.VizieR/J/ApJ/949/63doi:10.26093/cds/vizier/ba-xn-1zCDSOhno T.Tokuda K.Konishi A.Matsumoto T.Sewilo M.Kondo H.,Sano H.Tsuge K.Zahorecz S.Goto N.Neelamkodan N.Wong T.,Fukushima H.Takekoshi T.Muraoka K.Kawamura A.Tachihara K.,Fukui Y.Onishi T.2026-07-02T11:59:18Z2025-08-28T09:45:18ZCDS support team

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

cds-question@unistra.frco-line-emissionmagellanic-cloudsmolecular-cloudsinterstellar-mediuminfrared-sourcesThe nature of molecular clouds and their statistical behavior in subsolar metallicity environments are not fully explored yet. We analyzed data from an unbiased CO(J=2-1) survey at the spatial resolution of ~2pc in the northern region of the Small Magellanic Cloud with the Atacama Compact Array to characterize the CO cloud properties. A cloud-decomposition analysis identified 426 spatially/velocity-independent CO clouds and their substructures. Based on the cross-matching with known infrared catalogs by Spitzer and Herschel, more than 90% CO clouds show spatial correlations with point sources. We investigated the basic properties of the CO clouds and found that the radius-velocity linewidth (R-{sigma}v) relation follows the Milky Way-like power-law exponent, but the intercept is ~1.5 times lower than that in the Milky Way. The mass functions (dN/dM) of the CO luminosity and virial mass are characterized by an exponent of ~1.7, which is consistent with previously reported values in the Large Magellanic Cloud and in the Milky Way.2023ApJ...949...63Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/949/63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)J/ApJ/428/693 : Rosette Nebula and Maddalena Cloud structures (Williams+ 1994)J/ApJ/551/852 : FCRAO CO survey of the outer Galaxy (Heyer+, 2001)J/ApJS/149/343 : Giant molecular clouds in M33 (Engargiola+, 2003)J/ApJ/655/212 : S3MC IRAC and MIPS photometry (Bolatto+, 2007)J/ApJ/669/327 : S3MC: YSOs in N66, in SMC (Simon+, 2007)J/ApJ/686/948 : CO in extragalactic giant molecular clouds (Bolatto+, 2008)J/ApJS/178/56 : CO observations of LMC Giant Molecular clouds (Fukui+, 2008)J/AJ/142/103 : Cool evolved stars in SAGE-SMC and SAGE-LMC (Boyer+, 2011)J/ApJS/197/16 : CO observations of LMC molecular clouds (MAGMA). (Wong+, 2011)J/AJ/146/62 : HERschel HERITAGE in Magellanic Clouds (Meixner+, 2013)J/ApJ/778/15 : SAGE-SMC III. Young stellar objects (Sewilo+, 2013)J/ApJ/784/3 : The PAWS catalogs of GMCs and islands in M51 (Colombo+, 2014)J/AJ/148/124 : Herschel key program Heritage (Seale+, 2014)J/ApJ/835/55 : AzTEC/ASTE survey at 1.1mm toward the SMC (Takekoshi+, 2017)J/ApJ/853/175 : ^12^CO & ^13^CO cores & clumps in LHA 120-N 55 (Naslim+, 2018)J/ApJ/854/154 : N159 ^12^CO and ^13^CO (2-1) clumps (Nayak+, 2018)J/ApJ/904/13 : RVel for 10 giant eclipsing binaries (Graczyk+, 2020)J/A+A/641/A97 : ALMA Magellanic Bridge A mol. clouds (Valdivia-Mena+, 2020)J/ApJ/938/82 : CO mol. clumps and YSOs in NGC 602 region (O'Neill+, 2022)J/A+A/672/A153 : CO(2-1) survey at 9pc resolution in SMC (Saldano+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/949/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/949/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/949/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/949/63https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/949/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/949/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/949/63/table1 (Physical properties of CO trunks)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/949/63/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/949/63/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/949/63/table1?GETtext/xml+votable180.050000true14.445-72.3180.005555555555555556Cone search capability for table J/ApJ/949/63/table2 (Physical properties of CO leaves)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/949/63/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/949/63/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/949/63/table2?GETtext/xml+votable180.050000true14.737-72.1820.0055555555555555566/33306 33317 33328https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/949/63?format=asciiInfraredRadiodefaultJ/ApJ/949/63/table1Physical properties of CO trunksrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[0/425] Sequential trunk identifier used in this workmeta.id;meta.mainintIR[AB ] IR source (1)meta.codecharRAJ2000[14.42/17.3] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-72.4/-71.8] Declination (J2000)degpos.eq.dec;meta.mainVel[116.1/192.5] Centroid velocitykm/sphys.velocfloatdV[0.27/3.44] Linewidth, {sigma}_v_km/sspect.line.widthfloate_dV[0.02/0.6] Uncertainty in dVkm/sstat.error;spect.line.widthfloatamaj[1.9/43.1] rms size of the major axis, {sigma}_maj_arcsecphys.angSizefloatbmin[1.4/18.5] rms size of the minor axis, {sigma}_min_arcsecphys.angSize;srcfloatPA[-179.1/179.1] Position angle of the major axisdegpos.posAngfloatTpeak[0.4/10.4] Brightness temperature, peak value in voxelsKphys.temperature;stat.maxfloatLCO2-1[1.8/2625.2] CO(J=2-1) luminosityK.pc**2.km.s**-1phys.luminosity;em.line.COfloate_LCO2-1[0.1/1.8] Uncertainty in LCO2-1K.pc**2.km.s**-1stat.error;phys.luminosity;em.line.COfloatRdeconv[0.16/15.6] Beam deconvolution size, parsecs at D=62kpcpcphys.angSize;instr.beamfloate_Rdeconv[0.02/0.3] Uncertainty in Rdeconvpcstat.error;phys.angSize;instr.beamfloatMvir[45/191255] Virial mass, 1040*dV^2*Rdeconv (G1)solMassphys.massinte_Mvir[108/3147] Uncertainty in MvirsolMassstat.error;phys.massintNH2[0.4/30.1] Column density, H2 (G2)1e+21cm**-2phys.columnDensityfloatMCO[32/47329] Total gas mass (G2)solMassphys.massintnH2[1/780] Volume density, H2 (G2)100cm**-3phys.densityintJ/ApJ/949/63/table2Physical properties of CO leavesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[0/256] Sequential leaf identifier used in this workmeta.id;meta.mainintRAJ2000[14.46/17.12] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-72.3/-71.86] Declination (J2000)degpos.eq.dec;meta.mainVel[140.5/190.5] Centroid velocitykm/sphys.velocfloatdV[0.24/1.7] Linewidth, {sigma}_v_km/sspect.line.widthfloate_dV[0.05/0.5] Uncertainty in dVkm/sstat.error;spect.line.widthfloatamaj[1.9/11] Rms size of the major axis, {sigma}_maj_arcsecphys.angSizefloatbmin[1.1/6.2] Rms size of the minor axis, {sigma}_min_arcsecphys.angSize;srcfloatPA[-179.4/179.5] Position angle of the major axisdegpos.posAngfloatTpeak[0.4/10.4] Brightness temperature, peak value in voxelsKphys.temperature;stat.maxfloatLCO2-1[2.6/608.4] CO(J=2-1) luminosityK.pc**2.km.s**-1phys.luminosity;em.line.COfloate_LCO2-1[0.2/1.0] Uncertainty in LCO2-1K.pc**2.km.s**-1stat.error;phys.luminosity;em.line.COfloatRdeconv[0.06/4.34] Beam deconvolution size, parsecs at D=62kpcpcphys.angSize;instr.beamfloate_Rdeconv[0.04/0.32] Uncertainty in Rdeconvpcstat.error;phys.angSize;instr.beamfloatMvir[21/11513] Virial mass, 1040*dV^2*Rdeconv (G1)solMassphys.massinte_Mvir[76/819] Uncertainty in MvirsolMassstat.error;phys.massintNH2[0.5/28.4] Column density, H2 (G2)1e+21cm**-2phys.columnDensityfloatMCO[47/10969] Total gas mass (G2)solMassphys.massintnH2[1/84116] Volume density, H2 (G2)100cm**-3phys.densityint