J/MNRAS/483/5135ivo://CDS.VizieR/J/MNRAS/483/5135doi:10.26093/cds/vizier.74835135CDSWilliams T.G.Gear W.K.Smith M.W.L.2024-08-19T20:16:12Z2022-08-11T14:29:52ZCDS support team

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

cds-question@unistra.frgalaxiesinterstellar-mediummillimeter-astronomysubmillimeter-astronomyphotometryWe present a catalogue of Giant Molecular Clouds (GMCs) in M33, extracted from cold dust continuum emission. Our GMCs are identified by computing dendrograms. We measure the spatial distribution of these clouds, and characterize their dust properties. Combining these measured properties with CO(J=2-1) and 21cm HI data, we calculate the gas-to-dust ratio (GDR) of these clouds, and from this compute a total cloud mass. In total, we find 165 GMCs with cloud masses in the range of 10^4^-10^7^M_{sun}_. We find that radially, log_10_(GDR)=-0.043(+/-0.038)R[kpc]+1.88(+/-0.15), a much lower GDR than found in the Milky Way, and a correspondingly higher {alpha}_CO_ factor. The mass function of these clouds follows a slope proportional to M^-2.84^, steeper than many previous studies of GMCs in local galaxies, implying that M33 is poorer at forming massive clouds than other nearby spirals. While we can rule out interstellar pressure as the major contributing factor, we are unable to disentangle the relative effects of metallicity and HI velocity dispersion. We find a reasonably featureless number density profile with galactocentric radius, and weak correlations between galactocentric radius and dust temperature/mass. These clouds are reasonably consistent with Larson's scaling relationships, and many of our sources are co-spatial with earlier CO studies. Massive clouds are identified at large galactocentric radius, unlike in these earlier studies, perhaps indicating a population of CO-dark gas dominated clouds at these larger distances.2019MNRAS.483.5135Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/483/5135CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/483/5135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/483/5135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/483/5135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/483/5135https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/483/5135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/483/5135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/483/5135/tableb1 (Leaf node parameters for the GMCs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/5135/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/5135/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/5135/tableb1?GETtext/xml+votable180.050000true23.48333330.3728890.0055555555555555566/2154-2155 22412.3390025583187276e-22 1.9864425968556103e-21https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/483/5135?format=asciiMillimeterdefaultJ/MNRAS/483/5135/tableb1Leaf node parameters for the GMCsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[0/164] Giant Molecular Cloud identifiermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainRDeprojected distance from the centre of M33 (01h33m50.9s +30{deg}39'37"; Plucinsky et al. 2008ApJS..174..366P, Cat. J/ApJS/174/366)kpcpos.angDistancefloatFWHMFWHM of the cloudpcphys.angSizeintS100Flux density at 100umJyphot.flux.density;em.IR.60-100umfloate_S100Error on S100 (G1)Jystat.errorfloatS160Flux density at 160umJyphot.flux.density;em.mm.1500-3000GHzfloate_S160Error on S160 (G1)Jystat.errorfloatS250Flux density at 250umJyphot.flux.density;em.mm.750-1500GHzfloate_S250Error on S250 (G1)Jystat.errorfloatl_S450Limit flag for 3{sigma} limit on S450meta.code.errorcharS450Flux density at 450umJyphot.flux.density;em.mm.400-750GHzfloate_S450? Error on S450 (G1)Jystat.errorfloatnullablel_S850Limit flag for 3{sigma} limit on S850meta.code.errorcharS850Flux density at 850umJyphot.flux.density;em.mm.200-400GHzfloate_S850? Error on S850 (G1)Jystat.errorfloatnullableJ/MNRAS/483/5135/tablec1Calculated dust and gas properties for the GMCse_TError on T (G1)Kstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[0/164] Giant Molecular Cloud identifiermeta.id;meta.mainintTDust temperature (G1)Kphys.temperaturefloatlogMdustDust mass (G1)log(solMass)phys.massfloate_logMdustError on Mdust (G1)log(solMass)stat.errorfloatlogLTIRTotal infrared luminosity (G1)log(solLum)phys.luminosity;em.IRfloate_logLTIRError on LTIR (G1)log(solLum)stat.errorfloatl_LCOLimit flag for 3{sigma} limit on LCOmeta.code.errorcharLCOCO(J=2-1) luminosityK.km/sphot.fluxdoublee_LCO? Error on LCO (G1)K.km/sstat.errordoublenullablel_NHILimit flag for 3{sigma} limit on NHImeta.code.errorcharNHIHI surface densitysolMass.pc**-2phot.flux.density.sbfloate_NHI? Error on NHI (G1)solMass.pc**-2stat.errorfloatnullable