Chemical abundances in Seyfert galaxies – VIII. Argon abundance estimates

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dc.contributor.authorMonteiro, Adriano Francisco
dc.contributor.authorDors Júnior, Oli Luiz
dc.date.accessioned2025-04-04T16:09:36Z
dc.date.available2025-04-04T16:09:36Z
dc.date.issued22021
dc.description.abstractFor the first time, the argon abundance relative to hydrogen abundance (Ar/H) in the narrow line region of a sample of Seyfert 2 nuclei has been derived. In view of this, optical narrow emission line intensities of a sample of 64 local Seyfert 2 nuclei (z < 0.25) taken from Sloan Digital Sky Survey DR7 and measured by the MPA/JHU group were considered. We adopted the Te-method for AGNs, which is based on direct determination of the electron temperature, together with a grid of photoionization model results, built with the CLOUDY code, to obtain a method for the derivation of the Ar/H abundance. We find that for a metallicity range of 0.2 (Z/Z) 2.0, Seyfert 2 nuclei present Ar/H abundance ranging from ∼0.1 to ∼3 times the argon solar value, adopting log(O/H) = −3.31 and log(Ar/H) = −5.60. These range of values correspond to 8.0 (12 + log(O/H) 9.0 and 5.4 (12 + log(Ar/H) 6.9, respectively. The range of Ar/H and Ar/O abundance values obtained from our sample are in consonance with estimations from extrapolations of the radial abundance gradients to the central parts of the disc for four spiral galaxies. We combined our abundance results with estimates obtained from a sample of H II galaxies, which were taken from the literature, and found that the Ar/O abundance ratio decreases slightly as the O/H abundance increases.
dc.description.physical12 p.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Federal do Maranhão
dc.identifier.bibliographicCitationMONTEIRO, Adriano Francisco; DORS JUNIOR, Oli Luiz. Chemical abundances in Seyfert galaxies – VIII. Argon abundance estimates. Monthly Notices of the Royal Astronomical Society, v. 508, n. 1, p. 3023-3034, 2021. Disponível em:
dc.identifier.doi10.1093/mnras/stab2750
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/807
dc.language.isoen_US
dc.publisherRoyal Astronomical Society
dc.rights.holderMonthly Notices of the Royal Astronomical Society
dc.subject.keywordGalaxies: abundances
dc.subject.keywordGalaxies: active
dc.subject.keywordGalaxies: evolution
dc.subject.keywordGalaxies: nuclei
dc.titleChemical abundances in Seyfert galaxies – VIII. Argon abundance estimates
dc.typeArtigos de Periódicos

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