J/A+A/612/A81ivo://CDS.VizieR/J/A+A/612/A81doi:10.26093/cds/vizier.36120081CDSRiener M.Faesi C.M.Forbrich J.Lada C.J.2018-05-28T08:34:14Z2018-05-04T09:43:27ZCDS support team

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

cds-question@unistra.frgalaxiesWe use multi-band observations by the Herschel Space Observatory to study the dust emission properties of the nearby spiral galaxy NGC 300. We compile a first catalogue of the population of giant dust clouds (GDCs) in NGC 300, including temperature and mass estimates, and give an estimate of the total dust mass of the galaxy. We carried out source detection with the multiwavelength source extraction algorithm getsources. We calculated physical properties, including mass and temperature, of the GDCs from five-band Herschel PACS and SPIRE observations from 100-500{mu}m; the final size and mass estimates are based on the observations at 250{mu}m that have an effective spatial resolution of ~170pc. We correlated our final catalogue of GDCs to pre-existing catalogues of HII regions to infer the number of GDCs associated with high-mass star formation and determined the H{alpha} emission of the GDCs. Our final catalogue of GDCs includes 146 sources, 90 of which are associated with known HII regions. We find that the dust masses of the GDCs are completely dominated by the cold dust component and range from ~1.1x10^3^ to 1.4x10^4^M_{sun}_. The GDCs have effective temperatures of ~13-23K and show a distinct cold dust effective temperature gradient from the centre towards the outer parts of the stellar disk. We find that the population of GDCs in our catalogue constitutes ~16% of the total dust mass of NGC 300, which we estimate to be about 5.4x10^6^M_{sun}. At least about 87% of our GDCs have a high enough average dust mass surface density to provide sufficient shielding to harbour molecular clouds. We compare our results to previous pointed molecular gas observations in NGC 300 and results from other nearby galaxies and also conclude that it is very likely that most of our GDCs are associated with complexes of giant molecular clouds.2018A&A...612A..81Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/612/A81CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/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/A+A/612/A81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/612/A81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/612/A81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/612/A81https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/612/A81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/612/A81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/612/A81/tableb1 (Catalogue of giant dust clouds)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/612/A81/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/612/A81/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/612/A81/tableb1?GETtext/xml+votable180.050000true13.54564-37.628940.0055555555555555566/35536 35538https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/612/A81?format=asciidefaultJ/A+A/612/A81/tableb1Catalogue of giant dust cloudsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/146] Giant dust cloud (GDC) catalog identifiermeta.idintf_SeqFootnotes (1)meta.codecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainl_F100[<] Limit flag on F100meta.code.errorcharF100? Flux at 100 micronsmJyphot.flux.density;em.IR.60-100umfloatnullablee_F100? Uncertainty in F100mJystat.errorfloatnullablel_F160[<] Limit flag on F160meta.code.errorcharF160? Flux at 160 micronsmJyphot.flux.density;em.mm.1500-3000GHzfloatnullablee_F160? Uncertainty in F160mJystat.errorfloatnullablel_F250[<] Limit flag on F250meta.code.errorcharF250Flux at 250 micronsmJyphot.flux.density;em.mm.750-1500GHzfloate_F250? Uncertainty in F250mJystat.errorfloatnullablel_F350[<] Limit flag on F350meta.code.errorcharF350Flux at 350 micronsmJyphot.flux.density;em.mm.750-1500GHzfloate_F350? Uncertainty in F350mJystat.errorfloatnullablel_F500[<] Limit flag on F500meta.code.errorcharF500Flux at 500 micronsmJyphot.flux.density;em.mm.400-750GHzfloate_F500? Uncertainty in F500mJystat.errorfloatnullableamajSize estimate of major axisarcsecphys.angSizefloatbminSize estimate of minor axisarcsecphys.angSizefloatthetaRotational angle (east of the vertical axis) of amajdegpos.posAng;phys.mol.rotationfloatDDeprojected galactocentric distancekpcpos.distance;pos.galactocentricfloatDeqDiameter of equivalent circular areapcphys.angSizefloatTcold? Cold dust effective temperatureKphys.temperature.effectivefloatnullableMdust? Dust mass1000solMassphys.massfloatnullablee_Mdust? Uncertainty in Mdust1000solMassstat.errorfloatnullableF24Flux at 24 micronsmJyphot.flux.density;em.IR.15-30umfloate_F24Uncertainty in F24mJystat.errorfloatl_FHa[<] Limit flag on FHameta.code.errorcharFHaHalpha flux (in 10^-14^erg/cm^2^/s)1e-17W.m**-2phot.flux;em.line.Halphafloate_FHa? Uncertainty in FHa (in 10^-14^erg/cm^2^/s)1e-17W.m**-2stat.errorfloatnullableHIIAssociated Deharveng et al. (1988A&AS...73..407D) HII regions ([DCL88] NNNA in Simbad) (2)meta.id.assocchar