J/ApJ/959/110ivo://CDS.VizieR/J/ApJ/959/110doi:10.26093/cds/vizier/ba-xz-3eCDSLinville D.J.Luisi M.Anderson L.D.Liu B.Bania T.M.Balser D.S.,Wenger T.V.Haffner L.M.Mascoop J.L.2026-07-02T12:01:06Z2026-02-25T12:40:28ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyinterstellar-mediumh-ii-regionssurveysgalaxy-planesradio-astronomyinfrared-sourcesThe Green Bank Telescope Diffuse Ionized Gas Survey (GDIGS) traces ionized gas in the Galactic midplane by observing radio recombination line (RRL) emission from 4 to 8GHz. The nominal survey zone is 32.3{deg}>l>-5{deg}, |b|<0.5{deg}. Here, we analyze GDIGS Hn{alpha} ionized gas emission toward discrete sources. Using GDIGS data, we identify the velocity of 35 HII regions that have multiple detected RRL velocity components. We identify and characterize RRL emission from 88 HII regions that previously lacked measured ionized gas velocities. We also identify and characterize RRL emission from eight locations that appear to be previously unidentified HII regions and 30 locations of RRL emission that do not appear to be HII regions based on their lack of mid-infrared emission. This latter group may be a compact component of the Galactic Diffuse Ionized Gas. There are an additional 10 discrete sources that have anomalously high RRL velocities for their locations in the Galactic plane. We compare these objects' RRL data to 13CO, HI, and mid-infrared data, and find that these sources do not have the expected 24{mu}m emission characteristic of HII regions. Based on this comparison we do not think these objects are HII regions, but we are unable to classify them as a known type of object.2023ApJ...959..110Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/959/110CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)II/249 : WHAM Northern Sky Survey, V-1.1 (Haffner+, 2003)II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)II/311 : WISE All-Sky Data Release (Cutri+ 2012)J/ApJ/690/706 : Distances of Galactic HII regions (Anderson+, 2009)J/ApJS/181/255 : CO in Galactic HII regions (Anderson+, 2009)J/ApJS/194/32 : HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)J/A+A/537/A1 : Infrared fluxes of HII regions and PNe (Anderson+, 2012)J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)J/MNRAS/450/2025 : HIPASS-ZoA HII regions (Alves+, 2015)J/AJ/149/64 : MIPSGAL 24{mu}m point source catalog (Gutermuth+, 2015)J/ApJ/810/42 : Hydrogen RRL parameters of H II regions (Anderson+, 2015)J/ApJ/841/121 : HII region cand. in the OSC spiral arm (Armentrout+, 2017)J/ApJ/839/113 : Molecular clouds with GLIMPSE/MIPSGAL (Retes-Romero+, 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 : High-mass SFR plx & proper motion with VLBI (Reid+, 2019)J/MNRAS/500/3064 : The SEDIGISM survey: First Data Release (Schuller+, 2021)J/ApJS/254/36 : Southern HII Region Discovery Survey. II. (Wenger+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/959/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/959/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/959/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/959/110https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/959/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/959/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/959/110/gdigs (GDIGS Hnalpha RRL parameters from WISE catalog group (Table 2), candidate (Table 3) and radio-quiet HII regions (Table 4); new HII regions (Table 5), discrete emission zones (Table 6) and anomalous velocity features (Table 7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/959/110/gdigs?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/959/110/gdigs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/959/110/gdigs?GETtext/xml+votable180.050000true269.19336-25.045040.0055555555555555565/7278 6/28809 28813 28824-28825 28827-28828 28830-28831 28874 28897 28900-28901 28912 28915 28918-28919 29090-29091 29096-29097 29100-29101 29103 29118-29119 29461 29504-29505 29511 29522-29523 29529 29533 29535 30218-30219 30222 30244-30245 30247 30257-30259 30262-30263 30269 30312 30417 30425 30605 30607 30618https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/959/110?format=asciiInfraredRadiodefaultJ/ApJ/959/110/gdigsGDIGS Hnalpha RRL parameters from WISE catalog group (Table 2), candidate (Table 3) and radio-quiet HII regions (Table 4); new HII regions (Table 5), discrete emission zones (Table 6) and anomalous velocity features (Table 7)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identifier (GLLL.lll+BB.bbb)meta.id;meta.maincharf_NameFlag on Name (1)meta.codecharSetWISE catalog group (Table 2), candidate (Table 3) or radio-quiet HII regions (Table 4), new HII regions (Table 5), discrete emission zones (DEZs; Table 6) and anomalous velocity features (AVFs; Table 7)src.classcharGLON[0.1/360] Galactic longitudedegpos.galactic.lonGLAT[-0.9/1.2] Galactic latitudedegpos.galactic.latTL[2.6/464.2] Line intensity, T_L_mKspect.line.intensityfloate_TL[0.1/2.5] TL 1{sigma} uncertaintymKstat.error;spect.line.intensityfloatVLSR[-214/228] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSR[0.1/6.2] VLSR 1{sigma} uncertaintykm/sstat.error;phys.veloc;pos.lsrfloatDelV[5/81.1] The FWHM line width, {Delta}Vkm/sspect.line.widthfloate_DelV[0.1/15.6] DelV 1{sigma} uncertaintykm/sstat.error;spect.line.widthfloatrms[0.9/12.4] rms noisestat.stdev;instr.det.noisefloatS/N[3.5/410.5] Signal-to-noise ratiostat.snrfloatRad[105/752]? Region radius; not for the "WISE catalog" (Tables 2, 3 and 4)arcsecphys.angSize;srcintnullableA14Display data from the WISE catalog of Galactic HII regions (Anderson+ 2014, J/ApJS/212/1)meta.ref.urlintnullable_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.decindexed