J/ApJS/234/33ivo://CDS.VizieR/J/ApJS/234/33doi:10.26093/cds/vizier.22340033CDSAnderson L.D.Armentrout W.P.Luisi M.Bania T.M.Balser D.S.,Wenger T.V.2021-01-25T12:44:01Z2018-08-29T14:24:19ZCDS support team

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

cds-question@unistra.frh-ii-regionsradio-astronomyinfrared-sourcesAs part of our ongoing HII Region Discovery Survey (HRDS), we report the Green Bank Telescope detection of 148 new angularly large Galactic HII regions in radio recombination line (RRL) emission. Our targets are located at a declination of {delta}>-45{deg}, which corresponds to 266{deg}>l>-20{deg} at b=0{deg}. All sources were selected from the Wide-field Infrared Survey Explorer Catalog of Galactic HII Regions, and have infrared angular diameters >=260". The Galactic distribution of these "large" HII regions is similar to that of the previously known sample of Galactic HII regions. The large HII region RRL line width and peak line intensity distributions are skewed toward lower values, compared with that of previous HRDS surveys. We discover seven sources with extremely narrow RRLs <10km/s. If half the line width is due to turbulence, these seven sources have thermal plasma temperatures <1100K. These temperatures are lower than any measured for Galactic HII regions, and the narrow-line components may arise instead from partially ionized zones in the HII region photodissociation regions. We discover G039.515+00.511, one of the most luminous HII regions in the Galaxy. We also detect the RRL emission from three HII regions with diameters >100pc, making them some of the physically largest known HII regions in the Galaxy. This survey completes the HRDS HII region census in the Northern sky, where we have discovered 887 HII regions and more than doubled the size of the previously known census of Galactic HII regions.2018ApJS..234...33Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/234/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/249 : WHAM Northern Sky Survey, V-1.1 (Haffner+, 2003)VI/128 : Log of CGPS exposures (Taylor+, 2003-)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+A/171/261 : RRLs of Southern HII Regions (Caswell+ 1987)J/A+A/275/67 : Velocity Field of the outer Galaxy (Brand+ 1993)J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006)J/ApJ/690/706 : Distances of Galactic HII regions (Anderson+, 2009)J/ApJS/181/255 : CO in Galactic HII regions (Anderson+, 2009)J/ApJ/709/424 : HII regions identified with WMAPS and GLIMPSE (Murray+, 2010)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/753/62 : Kinematic distance ambiguity in HII regions (Jones+, 2012)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/ApJ/774/117 : HII region kinematic distances (Jones+, 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/ApJ/810/42 : Hydrogen RRL parameters of H II regions (Anderson+, 2015)J/MNRAS/450/2025 : HIPASS-ZoA HII regions (Alves+, 2015)J/A+A/588/A97 : Continuum sources from the THOR survey (Bihr+, 2016)http://www.cv.nrao.edu/hrds/ : HII Region Discovery Survey home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/234/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/234/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/234/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/234/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/234/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/234/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/234/33/table1 (Hydrogen Recombination Line parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/234/33/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/234/33/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/234/33/table1?GETtext/xml+votable180.050000true266.28203-28.866860.005555555555555556Cone search capability for table J/ApJS/234/33/table2 (Helium Recombination Line parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/234/33/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/234/33/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/234/33/table2?GETtext/xml+votable180.050000true266.28203-28.866860.005555555555555556Cone search capability for table J/ApJS/234/33/table3 (Carbon Recombination Line parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/234/33/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/234/33/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/234/33/table3?GETtext/xml+votable180.050000true270.6762-22.816980.0055555555555555566/1344 1789 1814 3031 3047 3289 3302 3320 3630 3727 3730 12970 14063 14267 14304 14317 14337 14354 14357 14358 14359 14361 14408 14409 14427 14430 14453 14607 14644 14670 14711 15391 15410 15412 15430 15442 15448 15632 15636 15670 15682 21646 21671 22078 22161 22173 22218 22243 23622 23637 23762 23766 23969 23982 23996 23998 24325 24376 28809 28828 28830 28875 28878 28892 28894 28912 28913 28916 28918 28919 29088 29101 29461 29507 29508 29510 29522 29532 30218 30219 30245 30259 30262 30269 30312 30318 30319 30330 30331 30416 30417 30420 30594 30600 30605 30619 30644 30645 30688 30690 30691 30692 30694 39259 40618 40619 42207 42229 42230 42378 42379 42380 42382 42383 42387 42390 42391 42392 42397 42439 42456 42460https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/234/33?format=asciiInfraredRadiodefaultJ/ApJS/234/33/table1Hydrogen Recombination Line parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifiermeta.id;meta.maincharprimarym_ID[abc] Multiple component (1)meta.code.multipcharKDDisplay the kinematic distances (table 4)meta.ref.urlcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latTL[1.8/145] Line intensity; Antenna temperaturemKspect.line.intensityfloate_TL[0.1/1.4] Uncertainty in TLmKstat.errorfloatDelV[1.2/55.4] Full-Width at Half Maximum line width {Delta}Vkm/sspect.line.widthfloate_DelV[0.1/2.7] Uncertainty in DelVkm/sstat.errorfloatVLSR[-131.1/151.5] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSR[0.1/1.2] Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatrms[0.7/2.5] Root mean square noise in spectrummKinstr.det.noise;stat.meanfloatA14Display the WISE catalog of HII regions (Anderson+, 2014, J/ApJS/212/1) within 1'meta.ref.urlintnullableHeDisplay the Helium Recombination Line parameters (table 2)meta.ref.urlintnullableCDisplay the Carbon Recombination Line parameters (table 3)meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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.decnullableindexedJ/ApJS/234/33/table2Helium Recombination Line parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifiermeta.id;meta.maincharm_ID[abc] Multiple component (1)meta.code.multipcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latTL[1.8/145] Line intensity; Antenna temperaturemKspect.line.intensityfloate_TL[0.1/1.4] Uncertainty in TLmKstat.errorfloatDelV[1.2/55.4] Full-Width at Half Maximum line width {Delta}Vkm/sspect.line.widthfloate_DelV[0.1/2.7] Uncertainty in DelVkm/sstat.errorfloatVLSR[-131.1/151.5] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSR[0.1/1.2] Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatrms[0.7/2.5] Root mean square noise in spectrummKinstr.det.noise;stat.meanfloat_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.decnullableindexedJ/ApJS/234/33/table3Carbon Recombination Line parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifiermeta.id;meta.maincharm_ID[abc] Multiple component (1)meta.code.multipcharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latTL[1.8/145] Line intensity; Antenna temperaturemKspect.line.intensityfloate_TL[0.1/1.4] Uncertainty in TLmKstat.errorfloatDelV[1.2/55.4] Full-Width at Half Maximum line width {Delta}Vkm/sspect.line.widthfloate_DelV[0.1/2.7] Uncertainty in DelVkm/sstat.errorfloatVLSR[-131.1/151.5] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSR[0.1/1.2] Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatrms[0.7/2.5] Root mean square noise in spectrummKinstr.det.noise;stat.meanfloat_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.decnullableindexedJ/ApJS/234/33/table4Kinematic distancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifiermeta.id;meta.maincharVLSR[-83.5/103.3] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatDN[2.3/7.2]? Near point distancekpcpos.distance;pos.heliocentricfloatnullableDF[2.5/17.4] Far point distancekpcpos.distance;pos.heliocentricfloatDT[2.5/7.4]? Tangent point distancekpcpos.distance;pos.heliocentricfloatnullableRGal[4.4/25.1] Galactocentric radiuskpcpos.distance;pos.galactocentricfloatVTP[12.6/108]? Tangent point velocitykm/sphys.veloc.transversefloatnullableKDARKinematic distance ambiguity resolution (T: tangent point distance; O: outer Galaxy source)meta.codecharDist[2.5/17.4] Heliocentric distancekpcpos.distancefloate_Dist[0/5.4] Dist uncertainty (1)kpcstat.errorfloatZ[-600/379] Vertical distance, Z, from the Galactic mid-planepcpos.cartesian.z;pos.galacticint