Artículo
Chemical abundances of Seyfert 2 AGNs, III : reducing the oxygen abundance discrepancy
Dors, Oli L.; Maiolino, Eliana Mailen
; Cardaci, Monica Viviana
; Hägele, Guillermo Federico
; Krabbe, Nora Cristina; Accossano Pérez, Natalia Antonela
; Armah, M.
Fecha de publicación:
08/2020
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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(Å) < 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.
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Dors, Oli L.; Maiolino, Eliana Mailen; Cardaci, Monica Viviana; Hägele, Guillermo Federico; Krabbe, Nora Cristina; et al.; Chemical abundances of Seyfert 2 AGNs, III : reducing the oxygen abundance discrepancy; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 496; 3; 8-2020; 3209-3221
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