J/MNRAS/487/1057ivo://CDS.VizieR/J/MNRAS/487/1057doi:10.26093/cds/vizier.74871057CDSDjordjevic J.O.Thompson M.A.Uruqhart J.S.Forbrich J.2024-08-19T20:18:45Z2019-06-05T09:40:39ZCDS support team

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

cds-question@unistra.frh-ii-regionsmillimeter-astronomysubmillimeter-astronomyWe have compiled the most complete compact and ultracompact HII region catalogue to date via multi-wavelength inspection of survey data. We utilise data from the recently available SASSy 850um survey to identify massive star forming clumps in the outer Galaxy (R_GC_>8.5kpc) and cross-match with infrared and radio data of known UC HII regions from the RMS database. For the inner Galaxy sample (R_GC_<8.5kpc), we adopt the compact HII regions from previous works that used similar methods to cross match ATLASGAL with either CORNISH or RMS, depending on the location within the Galactic plane. We present a new UC HII region catalogue that more than doubles the original sample size of previous work, totalling 536 embedded HII regions and 445 host clumps. We examine the distance independent values of N_Ly_/M and L_bol_/M as proxies for massive star formation efficiency and overall star formation efficiency, respectively. We find a significant trend showing that L_bol_/M decreases with increasing RGC, suggesting that the overall star formation per unit mass is less in the outer Galaxy.2019MNRAS.487.1057Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/487/1057CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/435/400 : ATLASGAL. Properties of compact HII regions (Urquhart+ 2013)J/MNRAS/443/1555 : ATLASGAL massive star forming clumps sample (Urquhart+ 2014)J/MNRAS/473/1059 : Galactic clump properties complete sample (Urquhart+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/487/1057https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/487/1057http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/487/1057https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/487/1057https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/487/1057http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/487/1057GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapMillimeterdefaultJ/MNRAS/487/1057/table1Derived clump properties of the host molecular clumpsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPropindicates derived HII region propertie in table 2meta.ref.urlcharSubmmSubmillimetre name (AGAL for ATLASGAL objects; JCMTLSY for SASSy)`meta.id;meta.maincharprimaryr_Submm[1/3] Reference for Submm name (1)meta.ref;pos.frameintComplex? Complex that clump belongs to (if any)meta.id.parentcharHII[1/13]? HII Region Densitymeta.numberintnullablevlsr? LSR radial velocitykm/sspect.dopplerVeloc;pos.lsrfloatnullableD? Heliocentric distancekpcpos.distance;pos.heliocentricfloatnullableRgal? Galactocentric distancekpcpos.distance;pos.galactocentricfloatnullabler_D[1/4]? Reference for D (2)meta.ref;pos.frameintnullableRadius? Effective Radius of clumppcphys.size.radiusfloatnullableFsubmmPPeak submillimetre fluxJy/beamphot.flux.density;stat.maxfloatFsubmmIntIntegrated submillimetre fluxJyphot.flux.densityfloatRc? Gas-to-dust ratio value with Giannetti et al. (2015A&A...580L...7G) correctionphys.mass;arith.ratiofloatnullableLogNH2Column densitylog(cm**-2)phys.columnDensityfloatLogNH2c? Corrected column densitylog(cm**-2)phys.columnDensityfloatnullableLogMcl? Clump masslog(solMass)phys.massfloatnullableLogMclc? Corrected clump masslog(solMass)phys.massfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/487/1057/table2Derived HII region properties for a selection of the full sampleLogNly/M? Lyman continuum to mass ratiolog(ph.s**-1.solMass**-1)phys.mass;spect.continuum;arith.ratiofloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRadioRadio name (in galactic coordinates)meta.idcharr_Radio[1/3] Reference for Radio name (1)meta.ref;pos.frameintSubmmSubmillimetre namemeta.id;meta.maincharOffset? Offset between radio and submillimetre centresarcsecpos.angDistancefloatnullableFRadioP? Radio peak fluxmJy/beamphot.flux.density;em.radiofloatnullableFradioInt? Integrated fluxmJyphot.flux.density;em.radiodoublenullableDiam? Angular diameterarcsecphys.angSizefloatnullableDiampc? Physical diameterpcphys.angSizefloatnullableFreq? Frequency of observationsGHzem.freqfloatnullableLogNly? Lyman continuum fluxph/sphot.flux;em.UVfloatnullableLogLbol? Bolometric luminositylog(solLum)phys.luminosityfloatnullableLogLbol/M? Bolomatric luminosity to mass ratiolog(solLum.solMass**-1)phys.luminosityfloatnullableLogLbol/Mc? Corrected bolometric luminosity to mass ratiolog(solLum.solMass**-1)phys.luminosityfloatnullableLogNly/Mc? Corrected Lyman continuum to mass ratiolog(ph.s**-1.solMass**-1)phys.mass;spect.continuum;arith.ratiofloatnullable