J/MNRAS/514/5506ivo://CDS.VizieR/J/MNRAS/514/5506doi:10.26093/cds/vizier.75145506CDSDors O.L.Valerdi M.Freitas-Lemes P.Krabbe A.C.Riffel R.A.,Amores E.B.Riffel R.Armah M.Monteiro A.F.Oliveira C.B.2025-10-10T20:12:16Z2025-06-06T15:13:59ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesgalaxiesvisible-astronomyspectroscopystar-forming-regionschemical-abundancesFor the first time, the helium abundance relative to hydrogen (He/H), which relied on direct measurements of the electron temperature, has been derived in the narrow line regions (NLRs) from a local sample of Seyfert 2 nuclei. In view of this, optical emission line intensities [3000 < {lambda}({AA}) < 7000] of 65 local Seyfert 2 nuclei (z < 0.2), taken from Sloan Digital Sky Survey Data Release 15 and additional compilation from the literature, were considered. We used photoionization model grid to derive an Ionization Correction Factor (ICF) for the neutral helium. The application of this ICF indicates that the NLRs of Seyfert 2 present a neutral helium fraction of ~50 per cent in relation to the total helium abundance. We find that Seyfert 2 nuclei present helium abundance ranging from 0.60 to 2.50 times the solar value, while ~85 per cent of the sample present oversolar abundance values. The derived (He/H)-(O/H) abundance relation from the Seyfert 2 is stepper than that of star-forming regions (SFs) and this difference could be due to excess of helium injected into the interstellar medium by the winds of Wolf-Rayet stars. From a regression to zero metallicity, by using Seyfert 2 estimates combined with SFs estimates, we obtained a primordial helium mass fraction Yp = 0.2441 +/- 0.0037, a value in good agreement with the one inferred from the temperature fluctuations of the cosmic microwave background by the Planck Collaboration, i.e. Y_p_^Planck^ = 0.2471 +/- 0.0003.2022MNRAS.514.5506Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/514/5506CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/501/1370 : Chemical abundances of Seyfert 2 AGNs IV (Dors+, 2021)J/MNRAS/505/4289 : Chemical abundances of nearby galaxies (Perez-diaz+, 2021)J/MNRAS/508/1084 : MaNGA star-forming galaxies (Kumari+, 2021)J/MNRAS/492/468 : Chemical abundances of Seyfert 2 AGNs - I (Dors+, 2020)J/MNRAS/469/2121 : Mass-metallicity relation revisited with CALIFAJ/ApJ/915/21 : CHAOS. VI. Direct abundances in NGC 2403 (Rogers+, 2021)J/ApJ/893/96 : CHAOS IV: NGC3184 LBT obs. & 3 other gal. abundancesJ/ApJ/896/77 : The PHLEK survey: oxygen & helium abundances (Hsyu+, 2020)J/ApJ/830/4 : HII region abundances in NGC 5457 (M101) (Croxall+, 2016)J/ApJ/806/16 : CHemical Abundances of Spirals (CHAOS). I. NGC628J/ApJ/808/42 : CHemical Abundances of Spirals (CHAOS) II. M51J/ApJS/217/12 : S7 observations with WiFeS of active galaxies (Dopita+,2015)J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)II/294 : The SDSS Photometric Catalog, Release 7https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/514/5506https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/514/5506http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/514/5506https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/514/5506https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/514/5506http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/514/5506GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/514/5506/tablea1 (Reddening corrected emission line intensities in relation to H{beta}=1.0 of Seyfert 2 galaxies sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/514/5506/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/514/5506/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/514/5506/tablea1?GETtext/xml+votable180.050000true24.9909111-0.75118030.005555555555555556Cone search capability for table J/MNRAS/514/5506/tablea2 (Reddening corrected emission line intensities in relation to H{beta}=1.0 of SF galaxies sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/514/5506/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/514/5506/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/514/5506/tablea2?GETtext/xml+votable180.050000true154.54441.44970.0055555555555555566/2229 2266 2275 2564 5283 5715 5970 6075 6087 6352 7243 7273 7281 7381 7446 7484 7688 7741 7743 7869 7878 9112 9208 9332 10348 10769 10970 10984 11027 11111 11132 11180 11239 11382 11782 11886 13707 14744 17771 17827 17850 18365 18793 18897 19482 21450 23076 23086 23102 23171 24750 24896 25734 25737 25739 25742 25890 27002 27219 27249 27258 27292 27529 27767 28075 31430 33317 34243 34426 36618 36861 38703-38704 38868 39836 40221 40410 40818 42027 42120 43339 43748 43925 44010 44660 44757 45883 45997 46399 46442 46790 46811 47260 47415 47543 48886https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/514/5506?format=asciiOpticaldefaultJ/MNRAS/514/5506/tablea1Reddening corrected emission line intensities in relation to H{beta}=1.0 of Seyfert 2 galaxies samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyName of the Seyfert 2 galaxy (ObjID)meta.id;meta.mainchar[OII]l3727/HbThe [O II] {lambda}3727{AA} to H{beta} line intensity ratio ([OII]{lambda}3727)spect.line.intensity;em.opt;arith.ratiofloate_[OII]l3727/Hb? Mean uncertainty of [OII]l3727/Hb (err[OII]{lambda}3727)stat.errorfloatnullable[OIII]l4363/HbThe [O III] {lambda}4363{AA} to H{beta} line intensity ratio ([OIII]{lambda}4363)spect.line.intensity;em.opt;arith.ratiofloate_[OIII]l4363/Hb? Mean uncertainty of [OIII]l4363/Hb (err[OIII]l4363/Hb)stat.errorfloatnullableHeIIl4686/HbThe HeII {lambda}4686{AA} to H{beta} line intensity ratio (HeII{lambda}4686)spect.line.intensity;em.opt;arith.ratiofloate_HeIIl4686/Hb? Mean uncertainty of HeIIl4686/Hb (errHeIIl4686/Hb)stat.errorfloatnullable[OIII]l5007/HbThe [OIII] {lambda}5007{AA} to H{beta} line intensity ratio ([OIII]{lambda}5007)spect.line.intensity;em.line.OIII;arith.ratiofloate_[OIII]l5007/Hb? Mean uncertainty of [OIII]l5007/Hb (err[OIII]l5007/Hb)stat.errorfloatnullableHeIl5876/HbThe HeI {lambda}5876{AA} to H{beta} line intensity ratio (HeI{lambda}5876)spect.line.intensity;em.opt;arith.ratiofloate_HeIl5876/Hb? Mean uncertainty of HeIl5876/Hb (errHeI{lambda}5876)stat.errorfloatnullableHa/HbThe H{alpha} {lambda}6563{AA} to H{beta} line intensity ratio (H{alpha}{lambda}6563)spect.line.intensity;em.line.Halpha;em.line.Hbetafloate_Ha/Hb? Mean uncertainty of Ha/Hb (errH{alpha}{lambda}6563)stat.error;phys.abundfloatnullable[NII]/HbThe [NII] {lambda}6583{AA} to H{beta} line intensity ratio ([NII]{lambda}6583)spect.line.intensity;em.opt;arith.ratiofloate_[NII]/Hb? Mean uncertainty of [NII]/Hb (err[NII]{lambda}6583)stat.errorfloatnullable[SII]l6716/HbThe [SII] {lambda}6716{AA} to H{beta} line intensity ratio ([SII]{lambda}6716)spect.line.intensity;em.opt;arith.ratiofloate_[SII]l6716/Hb? Mean uncertainty of [SII]l6716/Hb (err[SII]l6716/Hb)stat.errorfloatnullable[SII]l6731/HbThe [SII] {lambda}6731{AA} to H{beta} line intensity ratio ([SII]{lambda}6731)spect.line.intensity;em.opt;arith.ratiofloate_[SII]l6731/Hb? Mean uncertainty of [SII]l6731/Hb (err[SII]{lambda}6731)stat.errorfloatnullabler_GalaxyReference of the galaxy data measurements (Ref) (1)meta.ref;pos.frameint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/MNRAS/514/5506/tablea2Reddening corrected emission line intensities in relation to H{beta}=1.0 of SF galaxies samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyName of the SF galaxy (ObjID)meta.id;meta.mainchar[OII]l3727/HbThe [O II] {lambda}3727{AA} to H{beta} line intensity ratio ([OII]{lambda}3727)spect.line.intensity;em.opt;arith.ratiofloate_[OII]l3727/HbMean uncertainty of [OII]l3727/Hb (err[OII]{lambda}3727)stat.errorfloat[OIII]l4363/HbThe [O III] {lambda}4363{AA} to H{beta} line intensity ratio ([OIII]{lambda}4363)spect.line.intensity;em.opt;arith.ratiofloate_[OIII]l4363/HbMean uncertainty of [OIII]l4363/Hb (err[OIII]l4363/Hb)stat.errorfloatHeIIl4686/HbThe HeII {lambda}4686{AA} to H{beta} line intensity ratio (HeII{lambda}4686)spect.line.intensity;em.opt;arith.ratiofloate_HeIIl4686/HbMean uncertainty of HeIIl4686/Hb (errHeIIl4686/Hb)stat.errorfloat[OIII]l5007/HbThe [OIII] {lambda}5007{AA} to H{beta} line intensity ratio ([OIII]{lambda}5007)spect.line.intensity;em.line.OIII;arith.ratiofloate_[OIII]l5007/HbMean uncertainty of [OIII]l5007/Hb (err[OIII]l5007/Hb)stat.errorfloatHeIl5876/HbThe HeI {lambda}5876{AA} to H{beta} line intensity ratio (HeI{lambda}5876)spect.line.intensity;em.opt;arith.ratiofloate_HeIl5876/HbMean uncertainty of HeIl5876/Hb (errHeI{lambda}5876)stat.errorfloatHa/HbThe H{alpha} {lambda}6563{AA} to H{beta} line intensity ratio (H{alpha}{lambda}6563)spect.line.intensity;em.line.Halpha;em.line.Hbetafloate_Ha/HbMean uncertainty of Ha/Hb (errH{alpha}{lambda}6563)stat.error;phys.abundfloat[NII]/HbThe [NII] {lambda}6583{AA} to H{beta} line intensity ratio ([NII]{lambda}6583)spect.line.intensity;em.opt;arith.ratiofloate_[NII]/HbMean uncertainty of [NII]/Hb (err[NII]{lambda}6583)stat.errorfloat[SII]l6716/HbThe [SII] {lambda}6716{AA} to H{beta} line intensity ratio ([SII]{lambda}6716)spect.line.intensity;em.opt;arith.ratiofloate_[SII]l6716/HbMean uncertainty of [SII]l6716/Hb (err[SII]l6716/Hb)stat.errorfloat[SII]l6731/HbThe [SII] {lambda}6731{AA} to H{beta} line intensity ratio ([SII]{lambda}6731)spect.line.intensity;em.opt;arith.ratiofloate_[SII]l6731/HbMean uncertainty of [SII]l6731/Hb (err[SII]{lambda}6731)stat.errorfloatr_GalaxyReference of the galaxy data measurements (Ref) (1)meta.ref;pos.frameint_RAPositions from literature references (right ascension part)degpos.eq.ra;meta.main_DEPositions from literature references (declination part)degpos.eq.dec;meta.mainJ/MNRAS/514/5506/tablea3Chemical abundances for the Seyfert 2 and SF galaxies samplesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyName of the SF galaxy (ObjID)meta.id;meta.mainchar[O+/H+]Ion oxygen O+ to ion hydrogen H+ abundance ratio (O+/H+) (1)phys.abund;arith.ratio;phys.atmol.ionStagefloate_[O+/H+]Mean uncertainty of [O+/H+] (errO+/H+)stat.error;phys.abundfloat[O2+/H+]Ion oxygen O2+ to ion hydrogen H+ abundance ratio (O2+/H+) (1)phys.abund;arith.ratio;phys.atmol.ionStagefloate_[O2+/H+]Mean uncertainty of [O2+/H+] (errO2+/H+)stat.error;phys.abundfloatICF(O)The ionization correction factor for the oxygen (ICFO) (2)arith.factor;meta.modelled;phys.atmol.ionizationfloat[O/H]Total oxygen to hydrogen abundance ratio (3)phys.abund;arith.ratio;phys.atmolfloate_[O/H]Mean uncertainty of [O/H] (errO/H)stat.error;phys.abundfloat[He+/H+]Ion helium He+ to ion hydrogen H+ abundance ratio (He+/H+) (1)phys.abund;arith.ratio;phys.atmol.ionStagefloate_[He+/H+]Mean uncertainty of [He+/H+] (errHe+/H+)stat.error;phys.abund.Yfloat[He2+/H+]Ion helium He2+ to ion hydrogen H+ abundance ratio (He+/H+) (1)phys.abund;arith.ratio;phys.atmol.ionStagefloate_[He2+/H+]Mean uncertainty of [He2+/H+] (errHe2+/H+)stat.error;phys.abundfloatICF(He)The ionization correction factor for the helium (ICFHe)arith.factor;meta.modelled;phys.atmol.ionizationfloat[He/H]Total helium to hydrogen abundance ratio (3)phys.abund.Y;arith.ratio;phys.atmolfloate_[He/H]Mean uncertainty of [He/H] (errHe/H)stat.error;phys.abund.Yfloat