Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy

We investigate the discrepancy between oxygen abundance estimations for narrow-line regions of active galactic nuclei (AGNs) type Seyfert 2 derived using direct estimations of the electron temperature (Te-method) and those derived using photoionization models. In view of this, observational emission...

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Detalles Bibliográficos
Autores principales: Dors, Oli L., Maiolino, Roberto, Cardaci, Mónica Viviana, Hägele, Guillermo Federico, Krabbe, Angela, Pérez-Montero, Enrique, Armah, M.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Ciencias Astronómicas
Galaxies: active
Galaxies: abundances
Galaxies: evolution
Galaxies: nuclei
Galaxies: formation
Galaxies: ISM
Galaxies: Seyfert
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125596
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125596
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: active
Galaxies: abundances
Galaxies: evolution
Galaxies: nuclei
Galaxies: formation
Galaxies: ISM
Galaxies: Seyfert
spellingShingle Ciencias Astronómicas
Galaxies: active
Galaxies: abundances
Galaxies: evolution
Galaxies: nuclei
Galaxies: formation
Galaxies: ISM
Galaxies: Seyfert
Dors, Oli L.
Maiolino, Roberto
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
Krabbe, Angela
Pérez-Montero, Enrique
Armah, M.
Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
topic_facet Ciencias Astronómicas
Galaxies: active
Galaxies: abundances
Galaxies: evolution
Galaxies: nuclei
Galaxies: formation
Galaxies: ISM
Galaxies: Seyfert
description We investigate the discrepancy between oxygen abundance estimations for narrow-line regions of active galactic nuclei (AGNs) type Seyfert 2 derived using direct estimations of the electron temperature (Te-method) and those derived using photoionization models. In view of this, observational emission-line ratios in the optical range (3000<;λ(A˚)&lt;7000) of Seyfert 2 nuclei compiled from the literature were reproduced by detailed photoionization models built with the CLOUDY code. We find that the derived discrepancies are mainly due to the inappropriate use of the relations between temperatures of the low (t₂) and high (t₃) ionization gas zones derived for H II regions in AGN chemical abundance studies. Using a photoionization model grid, we derived a new expression for t₂ as a function of t₃ valid for Seyfert 2 nuclei. The use of this new expression in the AGN estimation of the O/H abundances based on Te-method produces O/H abundances slightly lower (about 0.2 dex) than those derived from detailed photoionization models. We also find that the new formalism for the Te-method reduces by about 0.4 dex the O/H discrepancies between the abundances obtained from strong emission-line calibrations and those derived from direct estimations.
format Articulo
Preprint
author Dors, Oli L.
Maiolino, Roberto
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
Krabbe, Angela
Pérez-Montero, Enrique
Armah, M.
author_facet Dors, Oli L.
Maiolino, Roberto
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
Krabbe, Angela
Pérez-Montero, Enrique
Armah, M.
author_sort Dors, Oli L.
title Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
title_short Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
title_full Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
title_fullStr Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
title_full_unstemmed Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
title_sort chemical abundances of seyfert 2 agns – iii. reducing the oxygen abundance discrepancy
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/125596
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