J/MNRAS/437/1791ivo://CDS.VizieR/J/MNRAS/437/1791doi:10.26093/cds/vizier.74371791CDSUrquhart J.S.Figura C.C.Moore T.J.T.Hoare M.G.Lumsden S.L.,Mottram J.C.Thompson M.A.Oudmaijer R.D.2026-01-13T20:28:30Z2014-02-03T09:38:52ZCDS support team

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

cds-question@unistra.frmolecular-cloudsradio-astronomypre-main-sequence-starsspectroscopyWe have used the well-selected sample of ~1750 embedded, young, massive stars identified by the Red MSX Source (RMS) survey to investigate the Galactic distribution of recent massive star formation. We present molecular line observations for ~800 sources without existing radial velocities. We describe the various methods used to assign distances extracted from the literature and solve the distance ambiguities towards approximately 200 sources located within the solar circle using archival Hi data. These distances are used to calculate bolometric luminosities and estimate the survey completeness (~2x10^4^L_{sun}_). In total, we calculate the distance and luminosity of ~1650 sources, one third of which are above the survey's completeness threshold. Examination of the sample's longitude, latitude, radial velocities and mid-infrared images has identified ~120 small groups of sources, many of which are associated with well-known star formation complexes, such as G305, G333, W31, W43, W49 and W51. We compare the positional distribution of the sample with the expected locations of the spiral arms, assuming a model of the Galaxy consisting of four gaseous arms. The distribution of young massive stars in the Milky Way is spatially correlated with the spiral arms, with strong peaks in the source position and luminosity distributions at the arms' Galactocentric radii. The overall source and luminosity surface densities are both well correlated with the surface density of the molecular gas, which suggests that the massive star formation rate per unit molecular mass is approximately constant across the Galaxy. A comparison of the distribution of molecular gas and the young massive stars to that in other nearby spiral galaxies shows similar radial dependences. We estimate the total luminosity of the embedded massive star population to be ~0.76x10^8^L_{sun}_, 30 per cent of which is associated with the 10 most active star-forming complexes. We measure the scaleheight as a function of the Galactocentric distance and find that it increases only modestly from ~20-30pc between 4 and 8kpc, but much more rapidly at larger distances.2014MNRAS.437.1791Uhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/437/1791CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/476/1019 : Southern candidate massive YSOs RMS survey (Mottram+, 2007)J/A+A/487/253 : RMS survey: ^13^CO observations of YSOs (Urquhart+ 2008)J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)J/A+A/507/795 : RMS survey: water masers of YSOs (Urquhart+, 2009)J/A+A/510/A89 : RMS survey of young massive stars in far-IR (Mottram+, 2010)J/MNRAS/410/1237 : Red MSX survey (RMS) massive young stars (Urquhart+, 2011)J/A+A/525/A149 : Red MSX Survey (RMS) YSOs bolometric fluxes (Mottram+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/437/1791https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/437/1791http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/437/1791https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/437/1791https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/437/1791http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/437/1791GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/437/1791/table1 (Molecular line parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/437/1791/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/437/1791/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/437/1791/table1?GETtext/xml+votable180.050000true272.362-20.32450.005555555555555556Cone search capability for table J/MNRAS/437/1791/table2 (Complex parameters derived by averaging all associated members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/437/1791/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/437/1791/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/437/1791/table2?GETtext/xml+votable180.050000true290.8182914.424160.005555555555555556Cone search capability for table J/MNRAS/437/1791/table3 (Kinematic distances and distance ambiguity solutions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/437/1791/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/437/1791/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/437/1791/table3?GETtext/xml+votable180.050000true273.062713-20.1909140.0055555555555555565/7275 7278 7376 10413 10420 10444 10453 10553 10556 10598 10609 10624 6/1340 3303 3311 3630 3649 12974 14267 14307 14317 14356 14358 14409 14594 14691-14692 15682 20831 21504 21510 21542 21637 21639 21641 21643 21645-21646 21670 22038 22040 22045 22070 22115 22212 22243 23666 23764 23773 23968 23977 23982 24320 24325 24361 24365 24554 29070 29091-29092 29094 29097 29116 29118 29440 29461 29463 29508 29510-29511 29517 29520 29522 29532 29534-29535 30218-30219 30240-30241 30244-30245 30256 30258-30259 30262-30263 30268-30269 30312-30314 30317-30319 30341 30417 30420 30423 30592 30594 30601 30606-30607 30616 30618 30641 30644 30691 30694 30701 30715 37333 37335 37342-37343 37362 37364 37366-37369 37372-37374 37718 37732 37746 37752 37829 37831 37839 37842 37848-37850 37855 37860-37861 37872 37878 37882 37884 37886-37887 37893-37896 37900 37902 37904-37905 37922-37924 37928-37929 37931 37934 38016 38018-38020 38024 38026 39240 39246 39248-39250 39252 39258-39259 39268 39270 39273 39276 39282 39375 39386 39404 39745 39774 39803 39895 39899 39926 40612 40618-40619 41595 41597 41599 41656-41658 41660-41661 41663 41670-41671 41673 41675-41678 41684-41686 41688 41698 41702 41734 41740 41756 41758-41759 41763 41766-41767 41769-41770 41772-41773 41780-41782 41799 41801 41804-41806 41809 41811 41816-41817 41820 41824-41825 42155 42158-42159 42169-42174 42190 42206-42207 42210-42211 42216 42228-42230 42233 42376 42378-42379 42381-42383 42387 42390-42391 42396-42398 42400 42417 42434-42435 42440-42441 42444 42500-42502 42512 42514-42516 42518 42560 43011 43013-43015 43017-43021 43024 43026 43040-43041https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/437/1791?format=asciiRadiodefaultJ/MNRAS/437/1791/table1Molecular line parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXSource name (GLLL.llll+BB.bbbb)meta.id;meta.maincharm_MSX[1/2]? Multipliciy index on MSXmeta.code.multipintnullableNsNumber of transitions observed, and/or distance solutions for this sourcemeta.numberintnullableRAJ2000Source right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Source declination (J2000)pos.eq.dec;meta.mainTransMolecular transition (1)physcharrms? Noise per spectral channelmKstat.snrintnullableVLSR? Radial velocity of the sourcekm/sspect.dopplerVeloc;pos.lsrfloatnullablee_VLSR? Error in radial velocity of the sourcekm/sstat.error;phys.veloc;pos.lsrfloatnullableTa*? Measured antenna temperature - IntensityKphot.antennaTempfloatnullablee_Ta*? Error in measures antenna temperatureKstat.errorfloatnullableFWHM? Line widthkm/sspect.line.widthfloatnullablee_FWHM? Error Line widthkm/sstat.error;phys.angSizefloatnullablespDisplay the spectrummeta.ref.urlcharPSDownload the PostScript file containing this spectrummeta.ref.urlcharFileNameName of the file in fig1 Subdirectory, with .png or .eps extensionmeta.id;meta.filecharJ/MNRAS/437/1791/table2Complex parameters derived by averaging all associated members_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.raindexed_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.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGnameComplex galactic name (GLLL.lll+BB.bbb)meta.idcharComplexStar forming complex name(s)meta.id;meta.maincharGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latVLSRLocal Standard of Rest velocity of the complexkm/sphys.veloc;pos.lsrfloatNNumber of RMS sources associated with complexmeta.numberintDistHeliocentric distancekpcpos.distancefloatZDistance from the Galactic mid-planepcpos.cartesian.z;pos.galacticfloatRgcGalactocentric radius - distance from GCkpcpos.distance;phys.size.radius;pos.galactocentricfloatlogLTotal bolometric luminosity of associated sourcessolLumphys.luminosityfloatfLFraction of total RMS luminosity in the Galaxy L_bol_/L_Galaxy_%stat.stdev;phys.luminosity;arith.ratiofloatJ/MNRAS/437/1791/table3Kinematic distances and distance ambiguity solutionsZ? Distance from the Galactic mid-planepcpos.cartesian.z;pos.galacticfloatnullablespDisplay the spectrummeta.ref.urlcharPSDownload the PostScript file containing this spectrummeta.ref.urlcharFileNameName of the file in fig4 Subdirectory, with .png or .ps extensionmeta.id;meta.filechar_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.raindexed_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.decindexedn_Dist[NF? ] Kinematic distance solution (N=near, F=far, t=tangent, lower confidence =?)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSXSource namemeta.id;meta.maincharNsNumber of transitions observed, and/or distance solutions for this sourcemeta.numberintnullableGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latVLSR? Radial velocity of the complexkm/sspect.dopplerVeloc;pos.lsrfloatnullableDnear? Kinematic near distancekpcpos.distancefloatnullableDfar? Kinematic far distancekpcpos.distancefloatnullableDist? Heliocentric distancekpcpos.distancefloatnullableRgc? Galactocentric radius (distance from GC)kpcphys.size.radius;pos.galactocentricfloatnullable