J/ApJ/806/199ivo://CDS.VizieR/J/ApJ/806/199doi:10.26093/cds/vizier.18060199CDSBalser D.S.Wenger T.V.Anderson L.D.Bania T.M.2018-02-01T05:47:37Z2017-09-18T12:28:53ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyh-ii-regionsradio-astronomyradio-continuum-emissionElemental abundance patterns in the Galactic disk constrain theories of the formation and evolution of the Milky Way. H II region abundances are the result of billions of years of chemical evolution. We made radio recombination line and continuum measurements of 21 H II regions located between Galactic azimuth Az=90{deg}-130{deg}, a previously unexplored region. We derive the plasma electron temperatures using the line-to-continuum ratios and use them as proxies for the nebular [O/H] abundances, because in thermal equilibrium the abundance of the coolants (O, N, and other heavy elements) in the ionized gas sets the electron temperature, with high abundances producing low temperatures. Combining these data with our previous work produces a sample of 90 H II regions with high-quality electron temperature determinations. We derive kinematic distances in a self-consistent way for the entire sample. The radial gradient in [O/H] is -0.082+/-0.014 dex/kpc for Az=90{deg}-130{deg}, about a factor of 2 higher than the average value between Az=0{deg}-60{deg}. Monte Carlo simulations show that the azimuthal structure we reported for Az=0{deg}-60{deg} is not significant because kinematic distance uncertainties can be as high as 50% in this region. Nonetheless, the flatter radial gradients between Az=0{deg}-60{deg} compared with Az=90{deg}-130{deg} are significant within the uncertainty. We suggest that this may be due to radial mixing from the Galactic Bar whose major axis is aligned toward Az~30{deg}.2015ApJ...806..199Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/806/199CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/653/1226 : Physical properties of galactic HII regions (Quireza+, 2006)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/806/199https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/806/199http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/806/199https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/806/199https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/806/199http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/806/199GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/806/199/table3 (H II Region Properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/806/199/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/806/199/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/806/199/table3?GETtext/xml+votable180.050000true266.44405-28.248360.0055555555555555565/7578 6/1297 1330 1781 1839 1848 1930 3290 3303 3606 3639 3649 3718 3730 3755 14255 14263 14293 14304 14306 14307 14311 14314 14317 14344 14355 14358 14359 14406 14409 14430 14453 14621 14622 14624 14644 14666 14671 14682 14683 14688 14690 14691 14692 14693 14697 14704 14716 15368 15458 15461 15473 20849 21439 21458 21504 21550 21641 21646 21679 22078 22080 22249 23645 23764 23969 23982 24554 28830 28831 28875 28890 28912 28918 29091 29101 29114 29115 29116 29118 29463 29505 29508 29510 29515 29522 29533 29535 30218 30219 30241 30245 30259 30262 30269 30318 30319 30328 30341 30422 30423 30594 30600 30618 30619 30624 30641 30644 30645 30694 30695 30718 39804 42391 42395 42397 42398 42435 42436 42445 42449 42451 42455 42456 42460 42462https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/806/199?format=asciiRadiodefaultJ/ApJ/806/199/table1Radio Recombination Line Parameters of Galactic H II RegionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharEl[H C He] Element namemeta.id;phys.atmol.elementcharTLH (or He) radio recombination line (RRL) intensitymKspect.line.intensityfloate_TLUncertainty in TLmKstat.errorfloatDelVH (or He) RRL FWHM line widthkm/sspect.line.width;em.IR.Hfloate_DelVUncertainty in DelVkm/sstat.errorfloatVLSRLocal Standard of Rest velocitykm/sphys.veloc;pos.lsrfloate_VLSRUncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatTint? Total integration timehtime.epochfloatnullablerms? rms spectral noisemKstat.stdev;instr.det.noisefloatnullableQF[BCD-] Quality factor (G1)meta.code.qualcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/806/199/table2Radio Continuum Parameters of Galactic H II RegionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharTC-RAContinuum peak intensity along Right AscensionmKspect.line.intensityfloate_TC-RAUncertainty in TC-RAmKstat.errorfloatTheta-RAFWHM angular width ({Theta}) along Right Ascensionarcminphys.angSizefloate_Theta-RAUncertainty in Theta-RAarcminstat.errorfloatTC-DEContinuum peak intensity along DeclinationmKspect.line.intensityfloate_TC-DEUncertainty in TC-DEmKstat.errorfloatTheta-DEFWHM angular width ({Theta}) along Declinationarcminphys.angSizefloate_Theta-DEUncertainty in Theta-DEarcminstat.errorfloatTCAverage continuum peak intensitymKspect.line.intensityfloate_TCUncertainty in TCmKstat.errorfloatThetaAverage FWHM angular width ({Theta})arcminphys.angSizefloate_ThetaUncertainty in Thetaarcminstat.error;pos.posAngfloatQF[ABC] Quality factor (G1)meta.code.qualcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/806/199/table3H II Region PropertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmoreindicates Radio Recombination Line Parameters in table1 and Radio Continuum Parameters in table2meta.ref.urlcharNameSource namemeta.id;meta.maincharprimaryn_Name[b] Note on Name (1)meta.notecharGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latDsun1? Distance from the Sun (Kinematic-IAU) (3)kpcpos.distance;pos.heliocentricfloatnullablee_Dsun1? Uncertainty in Dsun1 (Kinematic-IAU) (3)kpcstat.errorfloatnullableAz1? Galactic azimuth (Kinematic-IAU) (3)degpos.framefloatnullableRgal1? Galactic radius (Kinematic-IAU) (3)kpcpos.distance;pos.galactocentricfloatnullableDsun2? Distance from the Sun (Kinematic-Reid) (4)kpcpos.distance;pos.heliocentricfloatnullablee_Dsun2? Uncertainty in Dsun2 (Kinematic-Reid) (4)kpcstat.errorfloatnullableAz2? Galactic azimuth (Kinematic-Reid) (4)degpos.framefloatnullableRgal2? Galactic radius (Kinematic-Reid) (4)kpcpos.distance;pos.galactocentricfloatnullableDsun3? Distance from the Sun (Best)kpcpos.distance;pos.heliocentricfloatnullablee_Dsun3? Uncertainty in Dsun3 (Best)kpcstat.errorfloatnullableAz3? Galactic azimuth (Best)degpos.framefloatnullableRgal3? Galactic radius (Best)kpcpos.distance;pos.galactocentricfloatnullableyHelium abundance by number (2)phys.abund.Yfloate_yUncertainty in ystat.error;pos.cartesian.yfloatTeLocal thermodynamic equilibrium (LTE) electron temperatureKphys.temperature.electron;pos.lg;phys.electroninte_TeUncertainty in TeKstat.errorintTelTelescope used for the RRL and continuum observations (140 Foot, GBT)instr.setupchar_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