J/ApJ/857/19ivo://CDS.VizieR/J/ApJ/857/19doi:10.26093/cds/vizier.18570019CDSFaesi C.M.Lada C.J.Forbrich J.2021-02-23T13:07:03Z2019-03-15T13:14:49ZCDS support team

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

cds-question@unistra.frh-ii-regionsmolecular-cloudsco-line-emissionWe have conducted a ^12^CO(2-1) survey of several molecular gas complexes in the vicinity of HII regions within the spiral galaxy NGC300 using the Atacama Large Millimeter Array (ALMA). Our observations attain a resolution of 10pc and 1km/s, sufficient to fully resolve giant molecular clouds (GMCs) and the highest obtained to date beyond the Local Group. We use the CPROPS algorithm to identify and characterize 250 GMCs across the observed regions. GMCs in NGC300 appear qualitatively and quantitatively similar to those in the Milky Way disk: they show an identical scaling relationship between size R and linewidth {Delta}V ({Delta}V{propto}R^0.48+/-0.05^), appear to be mostly in virial equilibrium, and are consistent with having a constant surface density of about 60M_{sun}_/pc^2^. The GMC mass spectrum is similar to those in the inner disks of spiral galaxies (including the Milky Way). Our results suggest that global galactic properties such as total stellar mass, morphology, and average metallicity may not play a major role in setting GMC properties, at least within the disks of galaxies on the star-forming main sequence. Instead, GMC properties may be more strongly influenced by local environmental factors such as the midplane disk pressure. In particular, in the inner disk of NGC 300, we find this pressure to be similar to that in the local Milky Way but markedly lower than that in the disk of M51, where GMCs are characterized by systematically higher surface densities and a higher coefficient for the size-linewidth relation.2018ApJ...857...19Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/857/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)J/ApJS/63/821 : Inner Galaxy Molecular clouds & cloud cores (Scoville+, 1987)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/AJ/128/1167 : ARAUCARIA project : NGC 300 Cepheids. II (Gieren+, 2004)J/ApJ/654/240 : Giant molecular clouds in M31 (Rosolowsky+, 2007)J/ApJ/661/830 : Giant molecular clouds of M33 (Rosolowsky+, 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/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)J/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)J/PASP/122/1397 : Spitzer Survey of Stellar Structure in Gal. (Sheth+, 2010)J/ApJS/197/16 : CO obs. of LMC molecular clouds (MAGMA). (Wong+, 2011)J/A+A/542/A108 : Giant molecular clouds in M33 (Gratier+, 2012)J/ApJ/772/107 : Giant molecular clouds in nearby gal. (Donovan Meyer+, 2013)J/ApJ/784/3 : The PAWS catalogs of GMCs and islands in M51 (Colombo+, 2014)J/ApJ/789/81 : Multiwavelength survey of HII reg. in NGC300 (Faesi+, 2014)J/ApJS/212/2 : GMCs in 4th Galactic quadrant (Garcia+, 2014)J/ApJ/803/16 : GMCs in NGC4526 based on ^12^CO (Utomo+, 2015)J/ApJ/821/125 : SMA obs. of giant molecular clouds in NGC 300 (Faesi+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/857/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/857/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/857/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/857/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/857/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/857/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/857/19/table1 (NGC 300 regions observed)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/857/19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/857/19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/857/19/table1?GETtext/xml+votable180.050000true13.5682917-37.581250.005555555555555556Cone search capability for table J/ApJ/857/19/table7 (Giant molecular cloud (GMC) catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/857/19/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/857/19/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/857/19/table7?GETtext/xml+votable180.050000true13.6178333-37.69805560.0055555555555555566/35536 35538https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/857/19?format=asciiRadiodefaultJ/ApJ/857/19/table1NGC 300 regions observedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[DCL88]Name of the HII regionmeta.id;meta.maincharprimaryNgmcNumber of GMCs for this region (link to table 7)meta.numberintnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainl_ICOLimit flag on ICOmeta.code.errorcharICO[0.01/1.2]? CO integrated intensity I_CO_ (1)Kspect.line.intensityfloatnullablev0[84.6/198.1]? Velocity centroid (1)km/sphys.velocfloatnullablef_v0[b] Flag on v0 (2)meta.codecharFWHM[4/24.1]? Spectral Gaussian fit FWHM (1)km/sspect.line.widthfloatnullablepPDisplay the HII region data from Faesi+, 2014, J/ApJ/789/81 and 2016, J/ApJ/821/125meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJ/857/19/table7Giant molecular cloud (GMC) catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[DCL88]Name of the HII regionmeta.id.parentcharIDCloud identifier within HII region (1)meta.id.part;meta.maincharRAJ2000[0] Hour of Right Ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000[37] Degree of Declination (J2000) (2)pos.eq.dec;meta.mainv0[79.2/200.3] Central velocity (3)km/sphys.veloc;em.wl.centralfloata/b[1/53]? Deconvolved aspect ratiophys.size.axisRatiofloatnullablePA[-90/89.6]? Deconvolved position angledegpos.posAngfloatnullableR[2.4/63.4]? Extrapolated & deconvolved sizepcphys.size.radiusfloatnullablee_R[0.6/6.1]? Uncertainty in R (4)pcstat.errorfloatnullableDelV[1/10.6] Extrapolated & deconvolved FWHM linewidthkm/sspect.line.widthfloate_DelV[0.3/3.3] Uncertainty in DelV (4)km/sstat.errorfloatMlum[1.4/1020] Luminous mass (5)1000solMassphys.massfloate_Mlum[0.8/41] Uncertainty in Mlum (4)1000solMassstat.errorfloatMvir[0.9/1180]? Virial mass1000solMassphys.massfloatnullablee_Mvir[1.1/142]? Uncertainty in Mvir (4)1000solMassstat.errorfloatnullableLCO[1.5/885] CO(2-1) luminosityK.km.s**-1.pc**2phys.luminosity;em.radiofloate_LCO[0.8/36] Uncertainty in LCO (4)K.km.s**-1.pc**2stat.errorfloatTmax[0.5/9.8] Peak CO(2-1) brightness temperatureKphys.temperature;stat.maxfloatS/N[4.5/48.1] Peak signal-to-noisestat.snr;stat.maxfloatNoteAdditional note(s) (6)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar