J/ApJS/254/36ivo://CDS.VizieR/J/ApJS/254/36doi:10.26093/cds/vizier.22540036CDSWenger T.V.Dawson J.R.Dickey J.M.Jordan C.H.Mcclure-Griffiths N.M.,Anderson L.D.Armentrout W.P.Balser D.S.Bania T.M.2023-08-25T09:40:42Z2023-04-04T13:16:58ZCDS support team

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

cds-question@unistra.frh-ii-regionssurveysradio-continuum-emissionmilky-way-galaxyinfrared-sourcesinterstellar-mediumThe Southern HII Region Discovery Survey (SHRDS) is a 900hr Australia Telescope Compact Array 4-10GHz radio continuum and radio recombination line (RRL) survey of Galactic HII regions and infrared-identified HII region candidates in the southern sky. For this data release, we reprocess all previously published SHRDS data and include an additional ~450hr of observations. The search for new HII regions is now complete over the range 259{deg}<l<346{deg}, |b|<4{deg} for HII region candidates with predicted 6GHz continuum peak brightnesses >~30mJy/beam. We detect radio continuum emission toward 730 targets altogether including previously known nebulae and HII region candidates. By averaging ~18 RRL transitions, we detect RRL emission toward 206 previously known HII regions and 436 HII region candidates. Including the northern sky surveys, over the last decade the HII Region Discovery Surveys have more than doubled the number of known Galactic HII regions. The census of HII regions in the Wide-field Infrared Survey Explorer (WISE) Catalog of Galactic HII Regions is now complete for nebulae with 9 GHz continuum flux densities >~250mJy. We compare the RRL properties of the newly discovered SHRDS nebulae with those of all previously known HII regions. The median RRL FWHM line width of the entire WISE Catalog HII region population is 23.9km/s and is consistent between Galactic quadrants. The observed Galactic longitude-velocity asymmetry in the population of HII regions probably reflects underlying spiral structure in the Milky Way.2021ApJS..254...36Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/254/36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/20 : Catalogue of HII Regions (Sharpless 1959)VII/216 : H-{alpha} emission regions in Southern Milky Way (Rodgers+ 1960)VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)J/A+A/171/261 : RRLs of Southern HII Regions (Caswell+ 1987)J/ApJS/91/347 : A 5-GHz VLA Survey of the Galactic Plane (Becker+ 1994)J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006)J/ApJS/194/32 : The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)J/ApJ/738/27 : Galactic HII regions RRL and continuum data (Balser+, 2011)J/ApJ/754/62 : HRDS III. HII region kinematic distances (Anderson+, 2012)J/ApJ/764/34 : HRDS IV. H, He and C radio recombination lines (Wenger+, 2013)J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)J/ApJS/221/26 : Radio obs. of Galactic WISE HII regions (Anderson+, 2015)J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/AJ/154/23 : Southern HII Region Discovery Survey: pilot (Brown+, 2017)J/ApJS/234/33 : A GBT survey of large Galactic HII regions (Anderson+, 2018)J/ApJS/240/14 : SIGGMA: inner galaxy data release (Liu+, 2019)J/ApJ/885/131 : ~200 high-mass SFR plx & proper motion with VLBI (Reid+, 2019)J/ApJ/887/114 : VLA ~8-10GHz obs. of WISE Galactic HII regions (Wenger+, 2019)J/ApJS/248/3 : A 4-6GHz RRL survey in the Milky Way (Chen+, 2020)J/ApJS/253/23 : VLA 9GHz obs. of HII region candidates (Armentrout+, 2021)http://astro.phys.wvu.edu/wise/ : The online WISE Cat. of Gal. HII Regions v2.4http://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/community/shrds/ : SHRDS homehttp://doi.org/10.11570/21.0002 : Data product archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/254/36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/254/36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/254/36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/254/36https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/254/36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/254/36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/254/36/table1 (Full catalog fields and targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table1?GETtext/xml+votable180.050000true112.485833-18.4639170.005555555555555556Cone search capability for table J/ApJS/254/36/table5 (Un-smoothed continuum detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table5?GETtext/xml+votable180.050000true112.509167-18.5453330.005555555555555556Cone search capability for table J/ApJS/254/36/table6 (Smoothed continuum detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table6?GETtext/xml+votable180.050000true112.510417-18.5431110.005555555555555556Cone search capability for table J/ApJS/254/36/table7 (Un-smoothed peak RRL detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table7?GETtext/xml+votable180.050000true112.51848-18.534840.005555555555555556Cone search capability for table J/ApJS/254/36/table8 (Smoothed peak RRL detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table8?GETtext/xml+votable180.050000true112.51848-18.534840.005555555555555556Cone search capability for table J/ApJS/254/36/table9 (Un-smoothed total RRL detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table9?GETtext/xml+votable180.050000true112.51848-18.534840.005555555555555556Cone search capability for table J/ApJS/254/36/table10 (Smoothed total RRL detections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/36/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/36/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/36/table10?GETtext/xml+votable180.050000true112.51848-18.534840.0055555555555555565/9475 9482 9812 10444 10453 10542-10543 10553 10556 10624 6/21504 28808-28809 28812 28814 28824 28826-28827 28831 28878 28900 28912 29091 29101 29114 29522 30219 30259 30262 37239 37244-37245 37247 37333-37335 37343 37365-37366 37368-37369 37371-37372 37374 37747 37752 37837 37839 37848-37850 37872 37882 37884 37886-37887 37895 37899 37906 37921 37923-37924 37926 38016 38018 38024 38026 39237 39246-39247 39252 39254 39265 39273 39276 39278 39283 39384 41596 41598-41599 41655-41658 41660-41662 41667 41671 41673 41675-41678 41681-41685 41696 41702 41758-41759 41762-41763 41765-41767 41769-41770 41772-41773 41780-41782 41799 41801 41804-41806 41811 41816-41817 41820 41824 41856 42159 42191 42206-42207 42210-42211 42216-42217 42228-42230 42376-42378 42380 42382 42387 42389 42391-42393 42396-42398 42435-42436 42438 42440-42441 42444-42445 42447 42449 42451 42454-42458 42460-42461 42500-42502 42512-42513 42516 43013-43015 43017-43021 43024 43026-43027 43040-43042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/254/36?format=asciiInfraredRadiodefaultJ/ApJS/254/36/table1Full catalog fields and targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identifiermeta.id;obs.fieldcharRAFField center Hour of Right Ascension (J2000)pos.eq.raDEFField center Degree of Declination (J2000)pos.eq.decNameWISE Catalog target identifier (G1)meta.id;meta.maincharprimaryCl[CGKQ] WISE Catalog classification (1)meta.code.classcharRAJ2000Target Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Target Degree of Declination (J2000)pos.eq.dec;meta.mainRadIR[7.6/3362] WISE Infrared radius, R_IR_arcsecphys.angSize;em.IRfloatRefReference code (2)meta.notecharNucdNumber of un-smoothed continuum detection measurements (link to Table 5)meta.numberintnullableNscdNumber of smoothed continuum detection measurements (link to Table 6)meta.numberintnullableNurrlNumber of un-smoothed peak RRL detection measurements (link to Table 7)meta.numberintnullableNsrrlNumber of smoothed peak RRL detection measurements (link to Table 8)meta.numberintnullableNutrrlNumber of un-smoothed total RRL detection measurements (link to Table 9)meta.numberintnullableNstrrlNumber of smoothed total RRL detection measurements (link to Table 10)meta.numberintnullableJ/ApJS/254/36/table5Un-smoothed continuum detectionsFieldField identifiermeta.id;obs.fieldcharQFContinuum detection quality factor (A=highest) (1)meta.code.qualcharnu[4392.4/10828.7] FrequencyMHzem.freqfloatDelnu[256/4000] BandwidthMHzinstr.bandwidthintBArea[0.19/10.3] Synthesized beam areaarcmin**2phys.angArea;instr.beamfloatScP[-2904/457877]? Source peak continuum brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublenullablee_ScP[0.01/5.6e+7]? Uncertainty in ScPmJy/beamstat.errordoublenullableRArea[0.01/4013]? Watershed region areaarcmin**2phys.angArea;obs.fieldnullableScT[0.01/146544]? Source total continuum flux densitymJyphot.flux.density;em.radio.6-12GHzdoublenullableNameHII region name (G1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.maine_ScT[0.01/725465]? Uncertainty in ScTmJystat.errordoublenullableJ/ApJS/254/36/table6Smoothed continuum detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainnu[4392.4/10828.7] FrequencyMHzem.freqfloatDelnu[256/4000] BandwidthMHzinstr.bandwidthintBArea[0.19/10.3] Synthesized beam areaarcmin**2phys.angArea;instr.beamfloatScP[-2904/457877]? Source peak continuum brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublenullablee_ScP[0.01/5.6e+7]? Uncertainty in ScPmJy/beamstat.errordoublenullableRArea[0.01/4013]? Watershed region areaarcmin**2phys.angArea;obs.fieldnullableScT[0.01/146544]? Source total continuum flux densitymJyphot.flux.density;em.radio.6-12GHzdoublenullablee_ScT[0.01/725465]? Uncertainty in ScTmJystat.errordoublenullableFieldField identifiermeta.id;obs.fieldcharQFContinuum detection quality factor (A=highest) (1)meta.code.qualcharNameHII region name (G1)meta.id;meta.maincharJ/ApJS/254/36/table7Un-smoothed peak RRL detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField identifiermeta.id;obs.fieldcharRRLRadio recombination line (s) (1)meta.id;spect.line;em.radio.6-12GHzcharnu[-4156/17282] RRL rest frequency (2)MHzem.freqfloatCompGaussian velocity component identifier (3)meta.code.multipcharSL[0/65837]? Gaussian peak RRL brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublenullablee_SL[0/3609]? Uncertainty in SLmJy/beamstat.errorfloatnullableVLSR[-269/191]? Fitted local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR[0/41]? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableDelV[5/164]? Fitted full-width at half-maximum line width, {Delta}Vkm/sspect.line.width;meta.modelledfloatnullablee_DelV[0.04/89]? Uncertainty in DelVkm/sstat.errorfloatnullableSC[-113077/337152] Continuum brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublee_SC[0/41274] Uncertainty in SCmJy/beamstat.errordoubleSNR[2.3/770]? Signal-to-Noise (4)stat.snrfloatnullable_GlonPositions from names (longitude part)degpos.galactic.lonindexed_GlatPositions from names (latitude part)degpos.galactic.latindexedNameHII region name (G1)meta.id;meta.mainchar_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.decindexedJ/ApJS/254/36/table8Smoothed peak RRL detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnu[-4156/17282] RRL rest frequency (2)MHzem.freqfloatSL[0/65837]? Gaussian peak RRL brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublenullablee_SL[0/3609]? Uncertainty in SLmJy/beamstat.errorfloatnullableVLSR[-269/191]? Fitted local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableFieldField identifiermeta.id;obs.fieldchare_VLSR[0/41]? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableDelV[5/164]? Fitted full-width at half-maximum line width, {Delta}Vkm/sspect.line.width;meta.modelledfloatnullablee_DelV[0.04/89]? Uncertainty in DelVkm/sstat.errorfloatnullableSC[-113077/337152] Continuum brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublee_SC[0/41274] Uncertainty in SCmJy/beamstat.errordoubleSNR[2.3/770]? Signal-to-Noise (4)stat.snrfloatnullable_GlonPositions from names (longitude part)degpos.galactic.lonindexed_GlatPositions from names (latitude part)degpos.galactic.latindexedRRLRadio recombination line (s) (1)meta.id;spect.line;em.radio.6-12GHzcharCompGaussian velocity component identifier (3)meta.code.multipchar_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.decindexedNameHII region name (G1)meta.id;meta.maincharJ/ApJS/254/36/table9Un-smoothed total RRL detectionsFieldField identifiermeta.id;obs.fieldcharRRLRadio recombination line (s) (1)meta.id;spect.line;em.radio.6-12GHzcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnu[-4156/17282] RRL rest frequency (2)MHzem.freqfloatCompGaussian velocity component identifier (3)meta.code.multipcharSL[0/65837]? Gaussian peak RRL brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublenullablee_SL[0/3609]? Uncertainty in SLmJy/beamstat.errorfloatnullableVLSR[-269/191]? Fitted local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR[0/41]? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableDelV[5/164]? Fitted full-width at half-maximum line width, {Delta}Vkm/sspect.line.width;meta.modelledfloatnullablee_DelV[0.04/89]? Uncertainty in DelVkm/sstat.errorfloatnullableSC[-113077/337152] Continuum brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoubleNameHII region name (G1)meta.id;meta.mainchar_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.decindexede_SC[0/41274] Uncertainty in SCmJy/beamstat.errordoubleSNR[2.3/770]? Signal-to-Noise (4)stat.snrfloatnullable_GlonPositions from names (longitude part)degpos.galactic.lonindexed_GlatPositions from names (latitude part)degpos.galactic.latindexedJ/ApJS/254/36/table10Smoothed total RRL detectionsFieldField identifiermeta.id;obs.fieldcharNameHII region name (G1)meta.id;meta.mainchar_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.recordintRRLRadio recombination line (s) (1)meta.id;spect.line;em.radio.6-12GHzcharnu[-4156/17282] RRL rest frequency (2)MHzem.freqfloatCompGaussian velocity component identifier (3)meta.code.multipcharSL[0/65837]? Gaussian peak RRL brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublenullablee_SL[0/3609]? Uncertainty in SLmJy/beamstat.errorfloatnullableVLSR[-269/191]? Fitted local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR[0/41]? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableDelV[5/164]? Fitted full-width at half-maximum line width, {Delta}Vkm/sspect.line.width;meta.modelledfloatnullablee_DelV[0.04/89]? Uncertainty in DelVkm/sstat.errorfloatnullableSC[-113077/337152] Continuum brightnessmJy/beamphot.flux.density;em.radio.6-12GHzdoublee_SC[0/41274] Uncertainty in SCmJy/beamstat.errordoubleSNR[2.3/770]? Signal-to-Noise (4)stat.snrfloatnullable_GlonPositions from names (longitude part)degpos.galactic.lonindexed_GlatPositions from names (latitude part)degpos.galactic.latindexed