J/ApJ/784/3ivo://CDS.VizieR/J/ApJ/784/3doi:10.26093/cds/vizier.17840003CDSColombo D.Hughes A.Schinnerer E.Meidt S.E.Leroy A.K.Pety J.,Dobbs C.L.Garcia-Burillo S.Dumas G.Thompson T.A.Schuster K.F.,Kramer C.2023-01-09T12:19:43Z2016-08-12T12:08:13ZCDS support team

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

cds-question@unistra.frgalaxiesmolecular-cloudsradial-velocitygalaxy-kinematicsinterstellar-mediumco-line-emissionUsing data from the PdBI Arcsecond Whirlpool Survey (PAWS), we have generated the largest extragalactic giant molecular cloud (GMC) catalog to date, containing 1507 individual objects. GMCs in the inner M51 disk account for only 54% of the total ^12^CO(1-0) luminosity of the survey, but on average they exhibit physical properties similar to Galactic GMCs. We do not find a strong correlation between the GMC size and velocity dispersion, and a simple virial analysis suggests that ~30% of GMCs in M51 are unbound. We have analyzed the GMC properties within seven dynamically motivated galactic environments, finding that GMCs in the spiral arms and in the central region are brighter and have higher velocity dispersions than inter-arm clouds. Globally, the GMC mass distribution does not follow a simple power-law shape. Instead, we find that the shape of the mass distribution varies with galactic environment: the distribution is steeper in inter-arm region than in the spiral arms, and exhibits a sharp truncation at high masses for the nuclear bar region. We propose that the observed environmental variations in the GMC properties and mass distributions are a consequence of the combined action of large-scale dynamical processes and feedback from high-mass star formation. We describe some challenges of using existing GMC identification techniques for decomposing the ^12^CO(1-0) emission in molecule-rich environments, such as M51's inner disk.2014ApJ...784....3Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/784/3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/772/107 : GMCs in nearby galaxies (Donovan Meyer+, 2013)J/A+A/542/A108 : Giant molecular clouds in M33 (Gratier+, 2012)J/ApJS/197/16 : CO observations of LMC molecular clouds (MAGMA). (Wong+, 2011)J/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)J/ApJS/178/56 : CO observations of LMC Giant Molecular clouds (Fukui+, 2008)J/ApJ/686/948 : CO in extragalactic giant molecular clouds (Bolatto+, 2008)J/ApJ/654/240 : Giant molecular clouds in M31 (Rosolowsky+, 2007)J/ApJS/149/343 : Giant molecular clouds in M33 (Engargiola+, 2003)J/ApJ/577/31 : PNe in six galaxies (Ciardullo+, 2002)J/ApJ/551/852 : FCRAO CO survey of the outer Galaxy (Heyer+, 2001)J/PASJ/53/971 : CO catalog of LMC molecular clouds (Mizuno+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/784/3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/784/3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/784/3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/784/3https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/784/3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/784/3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/784/3/table1 (PdBI Arcsecond Whirlpool Survey (PAWS) Giant Molecular Cloud (GMC) catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/784/3/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/784/3/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/784/3/table1?GETtext/xml+votable180.050000true202.502708347.18627220.005555555555555556Cone search capability for table J/ApJ/784/3/table7 (PdBI Arcsecond Whirlpool Survey (PAWS) island catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/784/3/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/784/3/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/784/3/table7?GETtext/xml+votable180.050000true202.452547.20227780.0055555555555555566/11027https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/784/3?format=asciiRadiodefaultJ/ApJ/784/3/table1PdBI Arcsecond Whirlpool Survey (PAWS) Giant Molecular Cloud (GMC) catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/1507] Object identification number (1)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVlsr[-125.1/132.6] Local standard of rest radial velocity ({Delta}V_LSR_) (2)km/sspect.dopplerVeloc;pos.lsrfloatTmax[1.1/16.5] Peak brightness temperature (T_max_) (3)Kphys.temperature;stat.maxfloatS/N[3.5/41.6] Peak Signal-to-Noise ratiostat.snr;stat.maxfloatReff[5/2346] Effective radius (4)pcphys.size.radiusintf_Reff[0/1] Radius measurement flag (1=upper limit, 0=actual measurement) (5)meta.codeinte_Reff[0/133] Uncertainty in Reffpcstat.errorintsigma[0.7/50.7] Velocity dispersion ({sigma}_v_) (6)km/sphys.veloc.dispersionfloate_sigma[0/23.7] Uncertainty in sigmakm/sstat.errorfloatLCO[0.1/6446.7] The CO luminosity L_CO_ (in 10^5^K.km/s.pc2 units) (7)phys.luminosity;em.radiofloate_LCO[0.1/56.5] Uncertainty in LCO (in 10^5^K.km/s.pc2 units)stat.errorfloatMvir[0.2/62661.8] Mass inferred from virial theorem (M_vir_) (8)100000solMassphys.massfloate_Mvir[0/1090.1] Uncertainty in Mvir100000solMassstat.errorfloatalpha[0.01/48.5] Virial parameter {alpha} (9)phys.mass;arith.ratiofloatPA[0/179] Position angle of object major axis (10)degpos.posAngintb/a[0.1/5.6] Minor-to-major axis ratio (11)phys.angSize;arith.ratiofloatRegRegion of M51 where a given object has been identified (CR, SA, or IA) (12)obs.fieldcharJ/ApJ/784/3/table7PdBI Arcsecond Whirlpool Survey (PAWS) island catalogReff[5/2346] Effective radius (4)pcphys.size.radiusintf_Reff[0/1] Radius measurement flag (1=upper limit, 0=actual measurement) (5)meta.codeinte_Reff[0/133] Uncertainty in Reffpcstat.errorintsigma[0.7/50.7] Velocity dispersion ({sigma}_v_) (6)km/sphys.veloc.dispersionfloate_sigma[0/23.7] Uncertainty in sigmakm/sstat.errorfloatLCO[0.1/6446.7] The CO luminosity L_CO_ (in 10^5^K.km/s.pc2 units) (7)phys.luminosity;em.radiofloate_LCO[0.1/56.5] Uncertainty in LCO (in 10^5^K.km/s.pc2 units)stat.errorfloatMvir[0.2/62661.8] Mass inferred from virial theorem (M_vir_) (8)100000solMassphys.massfloate_Mvir[0/1090.1] Uncertainty in Mvir100000solMassstat.errorfloatalpha[0.01/48.5] Virial parameter {alpha} (9)phys.mass;arith.ratiofloatPA[0/179] Position angle of object major axis (10)degpos.posAngintb/a[0.1/5.6] Minor-to-major axis ratio (11)phys.angSize;arith.ratiofloatRegRegion of M51 where a given object has been identified (CR, SA, or IA) (12)obs.fieldcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/1507] Object identification number (1)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVlsr[-125.1/132.6] Local standard of rest radial velocity ({Delta}V_LSR_) (2)km/sspect.dopplerVeloc;pos.lsrfloatTmax[1.1/16.5] Peak brightness temperature (T_max_) (3)Kphys.temperature;stat.maxfloatS/N[3.5/41.6] Peak Signal-to-Noise ratiostat.snr;stat.maxfloat