J/ApJ/753/62ivo://CDS.VizieR/J/ApJ/753/62doi:10.26093/cds/vizier.17530062CDSJones C.Dickey J.M.2017-11-29T11:48:41Z2014-03-12T08:43:27ZCDS support team

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

cds-question@unistra.frh-ii-regionsh-i-line-emissioninfrared-sourcesradio-sourcesUsing H I absorption spectra from the International Galactic Plane Survey, a new method is implemented to resolve the kinematic distance ambiguity for 75 H II regions with known systemic velocities from radio recombination lines. A further 40 kinematic distance determinations are made for H II region candidates without known systemic velocities through an investigation of the presence of H I absorption around the terminal velocity. New kinematic distance determinations can be used to further constrain spiral arm parameters and the location and extent of other structures in the Milky Way disk. H I absorption toward continuum sources beyond the solar circle is also investigated. Follow-up studies of H I at higher resolution than the 1' to 2' of existing Galactic Plane Surveys will provide kinematic distances to many more H II regions on the far side of the Galactic center. On the basis of the velocity channel summation technique developed in this paper, a much larger sample of H II regions will be analyzed in a future paper to remove the near-far distance ambiguity.2012ApJ...753...62Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/753/62CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)J/ApJS/194/32 : The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)J/ApJ/626/887 : HI clouds in Southern Galactic Plane Survey (Kavars+, 2005)J/ApJS/154/553 : Inner galaxy massive star formation regions (Sewilo+, 2004)J/ApJ/582/756 : Velocities of HII regions (Kolpak+, 2003)J/A+A/171/261 : RRLs of Southern HII Regions (Caswell+ 1987)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/753/62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/753/62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/753/62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/753/62https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/753/62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/753/62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/753/62/table2 (Kinematic distance ambiguity resolutions (KDARs) from velocity channel summations {Sigma}S_ch_)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/753/62/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/753/62/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/753/62/table2?GETtext/xml+votable180.050000true253.89179-43.459060.0055555555555555565/7383 10556 10624 6/29526 29557 30217 30218 30219 30222 30240 30241 30244 30245 30246 41813 41815 42158 42159 42169 42170 42171 42172 42173 42174 42206 42207 42210 42213 42214 42215 42216 42218 42228 42229 42230 42376 42379 42382 42400 42500 42512https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/753/62?format=asciiInfraredRadiodefaultJ/ApJ/753/62/table2Kinematic distance ambiguity resolutions (KDARs) from velocity channel summations {Sigma}S_ch_f_Vrrl[DT] Double or Triple sources (2)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitude of the source (1)degpos.galactic.lonGLATGalactic latitude of the source (1)degpos.galactic.latBnoise[0.07/0.5]? Baseline noise of the absorption spectrum ({sigma}(e^-{tau}^))stat.snrfloatnullableTcont[8/503]? Continuum temperature of the "on" source pixelKspect.line.intensityintnullableVterm[-141/126.1]? Terminal velocity (V_T_)km/sphys.velocfloatnullableVrrl[-122/115]? Velocity from radio recombination lines (V_RRL_) (3)km/sspect.dopplerVelocfloatnullableRefReference for velocities (4)meta.ref;pos.framecharSvel[-9/50]? Summation of velocity interval S(V_RRL_) to V_T_ for Case III HII regions (5)phot.flux;arith.ratiofloatnullablee_Svel[0.5/4.1]? Svel uncertaintystat.errorfloatnullableSin[4.6/144.3]? S_ch_ for the whole inner Galaxyphot.flux;arith.ratiofloatnullablee_Sin[0.6/4.6]? Sin uncertaintystat.errorfloatnullableStp[-5.5/55.1]? S_ch_ for the tangent point intervalphot.flux;arith.ratiofloatnullablee_Stp[0.3/2.4]? Stp uncertaintystat.errorfloatnullableSout[-9.2/24.9]? S_ch_ for the outer Galaxyphot.flux;arith.ratiofloatnullablee_Sout[0.6/4]? Sout uncertaintystat.errorfloatnullableKDARKDAR determination (6)src.classchardGR[2.8/12.3]? Galactic radius distance (d_GR_)kpcpos.distance;pos.galactocentricfloatnullableE_dGR[0.2/2.7]? Positive error on dGRkpcstat.error;stat.maxfloatnullablee_dGR[0.3/2.1]? Negative error on dGRkpcstat.errorfloatnullabledlos[2/19.5]? Kinematic distance (d_los_) (7)kpcpos.distance;pos.heliocentricfloatnullableE_dlos[0.5/2.6]? Positive error on dlos (7)kpcstat.error;stat.maxfloatnullablee_dlos[0.02/2.3]? Negative error on dlos (7)kpcstat.errorfloatnullablen_dlos[*f ] Remarks on dlos (8)meta.notecharSimbadSimbad column added by the CDSphot.flux;arith.ratiochar_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.decnullableindexed