J/MNRAS/477/3369ivo://CDS.VizieR/J/MNRAS/477/3369doi:10.26093/cds/vizier.74773369CDSEden D.J.Moore T.J.T.Urquhart J.S.Elia D.Plume R.Konig C.,Baldeschi A.Schisano E.Rigby A.J.Morgan L.K.Thompson M.A.2024-08-18T20:19:13Z2021-08-20T13:15:08ZCDS support team

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

cds-question@unistra.frstar-forming-regionsyoung-stellar-objectsgalaxy-classification-systemsWe have compared the star-formation properties of the W49A and W51 regions by using far-infrared data from the Herschel infrared Galactic Plane Survey (Hi-GAL) and 850-um observations from the James Clerk Maxwell Telescope (JCMT) to obtain luminosities and masses, respectively, of associated compact sources. The former are infrared luminosities from the catalogue of Elia et al., while the latter are from the JCMT Plane survey source catalogue as well as measurements from new data. The clump-mass distributions of the two regions are found to be consistent with each other, as are the clump-formation efficiency and star-formation efficiency analogues. However, the frequency distributions of the luminosities of the young stellar objects are significantly different. While the luminosity distribution in W51 is consistent with Galaxy-wide samples, that of W49A is top heavy. The differences are not dramatic and are concentrated in the central regions of W49A. However, they suggest that physical conditions there, which are comparable in part to those in extragalactic starbursts, are significantly affecting the star-formation properties or evolution of the dense clumps in the region.2018MNRAS.477.3369Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/477/3369CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/469/2163 : JCMT Plane Survey. First complete data release (Eden+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/477/3369https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/477/3369http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/477/3369https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/477/3369https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/477/3369http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/477/3369GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/477/3369/table2 (The W49A JCMT catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/3369/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/3369/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/3369/table2?GETtext/xml+votable180.050000true287.44388.619620.005555555555555556Cone search capability for table J/MNRAS/477/3369/tableb1 (The JPS sources associated with the W51 star-forming region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/3369/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/3369/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/3369/tableb1?GETtext/xml+votable180.050000true290.9171614.518070.005555555555555556Cone search capability for table J/MNRAS/477/3369/tableb2 (The Hi-GAL sources associated with the W49A star-forming region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/3369/tableb2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/3369/tableb2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/3369/tableb2?GETtext/xml+votable180.050000true287.521388.771350.005555555555555556Cone search capability for table J/MNRAS/477/3369/tableb3 (The Hi-GAL sources associated with the W51 star-forming region)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/3369/tableb3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/3369/tableb3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/3369/tableb3?GETtext/xml+votable180.050000true290.661913.912120.0055555555555555565/7673 6/30605 30607 30616 306182.3390025583187276e-22 2.3390025583187276e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/477/3369?format=asciiOpticaldefaultJ/MNRAS/477/3369/table2The W49A JCMT catalogue_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameW49A Source Catalogue Name (W49_NNN)meta.id;meta.maincharGLONGalactic longitude of peak positiondegpos.galactic.lonGLATGalactic latitude of peak positiondegpos.galactic.latGLONcGalactic longitude of central positiondegpos.galactic.lonGLATcGalactic latitude of central positiondegpos.galactic.latfloatamajSemi-major axisarcsecphys.angSize;srcintbminSemi-minor axisarcsecphys.angSize.sminAxisintPAPosition angle of sourcedegpos.posAngintReffEffective radius of the sourcearcsecphys.angSizeintFpeakPeak flux at 850umJy/beamphot.flux.density;em.mm.200-400GHzfloate_FpeakError on the peak fluxJy/beamstat.errorfloatFintIntegrated flux at 850umJyphot.flux.density;em.mm.200-400GHzfloatSNRSignal-to-noise ratiostat.snrfloate_FintError on the integrated fluxJystat.errorfloatW49Aflag[y/n] Flag if the source is associated with W49Ameta.codecharJ/MNRAS/477/3369/tableb1The JPS sources associated with the W51 star-forming region_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJPSJPS Compact Source Catalogue ID (JPSGLLL.lll+BB.bbb)meta.id;meta.maincharGLONGalactic longitude of peak positiondegpos.galactic.lonGLATGalactic latitude of peak positiondegpos.galactic.latJ/MNRAS/477/3369/tableb2The Hi-GAL sources associated with the W49A star-forming region_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHi-GALHi-GAL Source IDmeta.id;meta.mainintGLONGalactic longitude of peak positiondegpos.galactic.lonGLATGalactic latitude of peak positiondegpos.galactic.latJ/MNRAS/477/3369/tableb3The Hi-GAL sources associated with the W51 star-forming region_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHi-GALHi-GAL Source IDmeta.id;meta.mainintGLONGalactic longitude of peak positiondegpos.galactic.lonGLATGalactic latitude of peak positiondegpos.galactic.lat