J/PASP/130/K4301ivo://CDS.VizieR/J/PASP/130/K4301doi:10.26093/cds/vizier.61313301CDSWang L.-L.Luo A.-L.Hou W.Wang M.-X.Du B.Qin L.Han J.-S.2025-09-09T14:14:53Z2019-06-05T11:50:59ZCDS support team

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

cds-question@unistra.frh-ii-regionsspectroscopyWe spectroscopically identify 101 Galactic HII regions using spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey, cross-matched with an HII region catalog derived from the all-sky Wide-Field Infrared Survey Explorer (WISE) data. Among all HII regions in our sample, 47 sources are newly confirmed. Spatially, most of our identified HII regions are located in the anti-center area of the Galaxy. For each of the HII regions, we accurately extract and measure the nebular emission lines of the spectra, and estimate the oxygen abundances using the strong-line method. We focus on the abundance distribution of HII regions in the Galactic anti-center area. Accordingly, we derive the oxygen abundance gradient with a slope of -0.036+/-0.004dex/kpc, covering a range of R_G_ from 8.1 to 19.3kpc. In particular, we also fit the outer disk objects with a slope of -0.039+/-0.012dex/kpc, which indicates that there is no flattening of the radial oxygen gradient in the outer Galactic disk.2018PASP..130k4301Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/130/K4301CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/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/PASP/130/K4301https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/130/K4301http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/130/K4301https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/130/K4301https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/130/K4301http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/130/K4301GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/130/K4301/table1 (Catalog for the spectroscopic properties of HII regions in our sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/130/K4301/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/130/K4301/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/130/K4301/table1?GETtext/xml+votable180.050000true299.0477629.675960.0055555555555555565/327 6/1287 1289 1293 1297-1298 1330 1334 1346 1354 1379 1781 1785 1789 1930 1933 1956 3156 3286 3337 14063 14263 14304 14419 14426 14430-14431 14453 14621-14622 14633 14646-14647 14664 14666-14667 14683 14688 14694 14704 14709 14711-14712 14716 15429-15430 21438-21439 22088 22208 22216 22218 22240 22253 22805 22855 23637 23641 23645 23666 23764 23766 23774 23969 23972 23974 23976 23980 23982 23998 24325 24355 24370-24371 24378 24425 24472 24487 24496 24511 24554-24555https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/130/K4301?format=asciidefaultJ/PASP/130/K4301/table1Catalog for the spectroscopic properties of HII regions in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmoreindicates of 12+log(O/H) with other studiesmeta.ref.urlcharNameName (GLLL.lll+BB.bbb) (1)meta.id;meta.maincharprimaryn_Name[*] * for our newly confirmed HII regionsmeta.notecharGLONGalactic longitude (1)degpos.galactic.lonGLATGalactic latitude (1)degpos.galactic.latRG? Galactocentric radius (1)kpcpos.distance;pos.galactocentricfloatnullableCat[KQGC] (2)meta.codecharEWHaH{alpha} equivalent width0.1nmspect.line.eqWidthfloate_EWHarms uncertainty on EWHa0.1nmstat.errorfloat[OIII]/Hb? Line ratio [OIII]5007/H{beta}, not corrected for interstellar extinction (3)meta.notefloatnullablee_[OIII]/Hb? rms uncertainty on [OIII]/Hbstat.errorfloatnullable[NII]/HaLine ratio [NII]6585/H{alpha}, not corrected for interstellar extinction (3)phys.abund;arith.ratio;spect.linefloate_[NII]/Harms uncertainty on [NII]/Hastat.errorfloat[SII]/HaLine ratio [SII]6718,673/H{alpha}, not corrected for interstellar extinctionmeta.notefloate_[SII]/Harms uncertainty on [SII]/Hastat.errorfloat12+log(O/H)Abundance 12+log(O/H), not corrected for interstellar extinction)phys.abundfloate_12+log(O/H)rms uncertainty on 12+log(O/H)stat.errorfloatSimbadSimbad 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.decnullableindexedRad? Radius (1)degphys.angSizefloatnullableJ/PASP/130/K4301/table2Comparison of 12+log(O/H) between our abundance values and Te-based ones from the literaturerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (GLLL.lll+BB.bbb)meta.id;meta.maincharONameOther name (SNNN)meta.idchar12+log(O/H)Abundance 12+log(O/H), this workphys.abundfloat12+log(O/H)lAbundance 12+log(O/H), literaturephys.abundfloatr_12+log(O/H)lReference for 12+(O/H)l (1)meta.ref;pos.frameint