J/ApJ/810/42ivo://CDS.VizieR/J/ApJ/810/42doi:10.26093/cds/vizier.18100042CDSAnderson L.D.Hough L.A.Wenger T.V.Bania T.M.Balser D.S.2017-10-09T11:27:50Z2017-10-02T12:09:24ZCDS support team

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

cds-question@unistra.frh-ii-regionsradio-astronomyinfrared-sourcesH II regions are the ionized spheres surrounding high-mass stars. They are ideal targets for tracing Galactic structure because they are predominantly found in spiral arms and have high luminosities at infrared and radio wavelengths. In the Green Bank Telescope H II Region Discovery Survey (GBT HRDS), we found that >30% of first Galactic quadrant H II regions have multiple hydrogen radio recombination line (RRL) velocities, which makes determining their Galactic locations and physical properties impossible. Here we make additional GBT RRL observations to determine the discrete H II region velocity for all 117 multiple-velocity sources within 18{deg}<l<65{deg}. The multiple-velocity sources are concentrated in the zone 22{deg}<l<32{deg}, coinciding with the largest regions of massive star formation, which implies that the diffuse emission is caused by leaked ionizing photons. We combine our observations with analyses of the electron temperature, molecular gas, and carbon recombination lines to determine the source velocities for 103 discrete H II regions (88% of the sample). With the source velocities known, we resolve the kinematic distance ambiguity for 47 regions, and thus determine their heliocentric distances.2015ApJ...810...42Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/810/42CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/653/1226 : Physical properties of galactic HII regions (Quireza+, 2006)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/738/27 : Galactic HII regions RRL and continuum data (Balser+, 2011)J/ApJS/194/32 : The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)J/ApJ/754/62 : HRDS III. HII region kinematic distances (Anderson+, 2012)J/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/810/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/810/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/810/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/810/42https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/810/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/810/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/810/42/table1 (On-target Hydrogen RRL Parameters of Literature H II Regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/810/42/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/810/42/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/810/42/table1?GETtext/xml+votable180.050000true277.71945-10.160520.005555555555555556Cone search capability for table J/ApJ/810/42/table2 (Off-target Hydrogen RRL Parameters for the Full Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/810/42/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/810/42/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/810/42/table2?GETtext/xml+votable180.050000true276.50841-12.770980.0055555555555555565/7564 6/29508 29510 29511 29529 29532 29533 29535 30218 30219 30222 30240 30241 30244 30245 30260 30262 30263 30268 30269 30312 30318 30319 30417 30419 30420 30695https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/810/42?format=asciiRadioInfrareddefaultJ/ApJ/810/42/table1On-target Hydrogen RRL Parameters of Literature H II RegionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (GLLL.lll+B.bbb) (only in table1)meta.id;meta.maincharn_Source[abc ] Note on Source (only in table1) (1)meta.notecharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latTLDerived radio recombination line (RRL) peak antenna temperaturemKphot.antennaTemp;em.radio;stat.maxfloate_TLUncertainty in TLmKstat.errorfloatVLSRLocal Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSRUncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatDeltaVLine FWHMkm/sspect.line.widthfloate_DeltaVUncertainty in DeltaVkm/sstat.errorfloatrmsrms noisemKstat.stdev;instr.det.noisefloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/810/42/table2Off-target Hydrogen RRL Parameters for the Full SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latSep? Separation (2)arcminpos.angDistancefloatnullableTLDerived radio recombination line (RRL) peak antenna temperaturemKphot.antennaTemp;em.radio;stat.maxfloate_TLUncertainty in TLmKstat.errorfloatVLSRLocal Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSRUncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatDeltaVLine FWHMkm/sspect.line.widthfloate_DeltaVUncertainty in DeltaVkm/sstat.errorfloatrmsrms noisemKstat.stdev;instr.det.noisefloatRegionMultiple-velocity H II region(s) that use this off-target position in our subsequent analyses (GLLL.lll+BB.bbb) (only in table2)pos.posAng;obs.fieldchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/810/42/table4H II Region Velocities and DistancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name (GLLL.lll+BB.bbb)meta.id;meta.maincharVLSRLocal Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatDN? Near kinematic distancekpcpos.distance;pos.heliocentricfloatnullableDFFar kinematic distancekpcpos.distance;pos.heliocentricfloatDTPTangent point kinematic distancekpcpos.distance;pos.heliocentricfloatKDAR[FNT-] Kinematic distance ambiguity resolution (F:Far, N:Near or T:Tangent) (1)meta.codecharQF[ABC-] Quality factor for the KDAR (2)meta.code.qualcharRgalGalactocentric radiuskpcpos.distance;pos.galactocentricfloatDist? Heliocentric distancekpcpos.distancefloatnullableZ? Height above the planepcpos.cartesian.z;pos.galacticintnullableCritCriteria used to determine the H II region velocity (3)meta.codechar