J/ApJ/915/21ivo://CDS.VizieR/J/ApJ/915/21doi:10.26093/cds/vizier.19150021CDSRogers N.S.J.Skillman E.D.Pogge R.W.Berg D.A.Moustakas J.,Croxall K.V.Sun J.2024-11-18T20:11:05Z2023-01-19T12:39:38ZCDS support team

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

cds-question@unistra.frchemical-abundancesh-ii-regionsgalaxiesvisible-astronomyspectroscopyWe report the direct abundances for the galaxy NGC 2403 as observed by the CHemical Abundances Of Spirals (CHAOS) project. Using the Multi-Object Double Spectrograph on the Large Binocular Telescope, we observe two fields with HII regions that cover an Rg/Re range of 0.18-2.31. Thirty-two HII regions contain at least one auroral line detection, and we detect a total of 122 temperature-sensitive auroral lines. Here, for the first time, we use the intrinsic scatter in the Te-Te diagrams, added in quadrature to the uncertainty on the measured temperature, to determine the uncertainty on an electron temperature inferred for one ionization zone from a measurement in a different ionization zone. We then use all available temperature data within a HII region to obtain a weighted-average temperature within each ionization zone. We rederive the oxygen abundances of all CHAOS galaxies using this new temperature prioritization method, and we find that the gradients are consistent with the results of a recent study of Berg+ (2020, J/ApJ/893/96). For NGC 2403, we measure a direct oxygen abundance gradient of -0.09(+/-0.03)dex/Re, with an intrinsic dispersion of 0.037(+/-0.017)dex and a N/O abundance gradient of -0.17(+/-0.03)dex/Re with an intrinsic dispersion of 0.060(+/-0.018)dex. For direct comparison, we use the line intensities from an earlier study of NGC 2403 by Berg et al. and find their recomputed values for the O/H and N/O gradients are consistent with ours.2021ApJ...915...21Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/915/21CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/64 : Recombination line intensities for hydrogenic ions (Storey+ 1995)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)J/ApJ/675/1213 : Abundances in M33 HII regions (Rosolowsky+, 2008)J/ApJ/700/654 : Keck sp. of extragalactic HII regions (Esteban+ 2009)J/ApJS/190/233 : Spectrosc. & abundances of SINGS galaxies (Moustakas+, 2010)J/ApJ/765/140 : Stacked sp. of SDSS star forming galaxies (Andrews+, 2013)J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013)J/ApJ/806/16 : CHemical Abundances of Spirals. I. NGC628 (Berg+, 2015)J/ApJ/808/42 : CHemical Abundances of Spirals. II. M51 (Croxall+, 2015)J/MNRAS/455/2627 : Oxygen abundance gradient in M81 (Arellano-Cordova+, 2016)J/ApJ/830/4 : HII region abundances in NGC 5457 (M101) (Croxall+, 2016)J/A+A/587/A70 : CALIFA face-on spiral gal. oxygen (Sanchez-Menguiano+, 2016)J/ApJ/853/151 : Oxygen abund. for giant HII regions in NGC 2403 (Mao+, 2018)J/ApJ/887/80 : Gas phase oxygen abundances for HII regions (Kreckel+, 2019)J/ApJS/244/24 : A z=0 Multiwavelength Galaxy Synthesis. I. (Leroy+, 2019)J/ApJ/893/96 : CHAOS IV: NGC3184 LBT obs. (Berg+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/915/21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/915/21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/915/21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/915/21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/915/21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/915/21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/915/21/table2 (*NGC 2403 MODS/LBT observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/915/21/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/915/21/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/915/21/table2?GETtext/xml+votable180.050000true114.22666765.5964560.0055555555555555566/7743https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/915/21?format=asciiOpticaldefaultJ/ApJ/915/21/table2*NGC 2403 MODS/LBT observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy namemeta.id.parentcharIDHII region ID within galaxy (G1)meta.id;meta.maincharprimaryRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainRg[32.58/411.4] Radial distance of the region in arcsecarcsecphys.angSizefloatRg/Re[0.18/2.31] Radial distance of the region normalized to the effective radius, Repos.distance;arith.ratio;obs.fieldfloatRg-kpc[0.5/6.34] Radial distance of the region in kpckpcphys.size.radiusfloatOIIIDetection of [OIII]{lambda}4363 auroral line within S/N>3meta.codecharNIIDetection of [NII]{lambda}5755 auroral line within S/N>3meta.codecharSIIIDetection of [SIII]{lambda}6312 auroral line within S/N>3meta.codecharOIIDetection of [OII]{lambda}{lambda}7320,7330 auroral line within S/N>3 (1)meta.codecharSIIDetection of [SII]{lambda}{lambda}4068,4076 auroral line within S/N>3 (1)meta.codecharRL-CIICII{lambda}4267{AA} recombination line detectionmeta.codecharWRPresence of Wolf-Rayet features in the HII region optical spectrummeta.codecharCHbReddening at H{beta}, (H{beta}) (2)spect.line.intensity;arith.ratiofloate_CHbLower uncertainty on CHbstat.errorfloatE_CHbUpper uncertainty on CHbstat.error;stat.maxfloataHThe underlying stellar absorption, a_H_ (2)phys.absorptionfloate_aHLower uncertainty on aHstat.errorfloatE_aHUpper uncertainty on aHstat.error;stat.maxfloatFHbThe integrated H{beta} flux density, F(H{beta}), in units of 10^-16^erg/cm^2^/s (2)1e-19W.m**-2phot.flux;em.line.Hbetafloate_FHbLower uncertainty on FHb1e-19W.m**-2stat.errorfloatE_FHbUpper uncertainty on FHb1e-19W.m**-2stat.error;stat.maxfloatLinesDisplay the emission line intensities for this region (link to Table A1)meta.ref.urlcharJ/ApJ/915/21/tablea1*Emission line intensities in NGC 2403Int[0/1433]? Line intensity relative to H{beta}spect.line.intensity;arith.ratiodoublenullableE_Int[0.001/42]? Upper uncertainty in Intstat.error;stat.maxfloatnullablee_Int[0/42]? Lower uncertainty in Intstat.errorfloatnullableIDHII region identifier (G1)meta.id;meta.maincharIonIon identifierphys.atmol.ionStagerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3721/9546]? Wavelength in Angstroms0.1nmem.wlintnullable