A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models

We present a new methodology for the analysis of the emission lines of the interstellar medium in the narrow-line regions around type-2 active galactic nuclei. Our aim is to provide a recipe that can be used for large samples of objects in a consistent way using different sets of optical emission li...

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Autores principales: Pérez Montero, Enrique, Dors, Oli L., Vílchez, José M., García Benito, R., Cardaci, Mónica Viviana, Hägele, Guillermo Federico
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2019
Materias:
Astronomía
methods: data analysis
ISM: abundances
galaxies: abundances
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125484
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125484
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
methods: data analysis
ISM: abundances
galaxies: abundances
spellingShingle Astronomía
methods: data analysis
ISM: abundances
galaxies: abundances
Pérez Montero, Enrique
Dors, Oli L.
Vílchez, José M.
García Benito, R.
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
topic_facet Astronomía
methods: data analysis
ISM: abundances
galaxies: abundances
description We present a new methodology for the analysis of the emission lines of the interstellar medium in the narrow-line regions around type-2 active galactic nuclei. Our aim is to provide a recipe that can be used for large samples of objects in a consistent way using different sets of optical emission lines that takes into the account possible variations from the O/H–N/O relation to use [N II] lines. Our approach consists of a bayesian-like comparison between certain observed emission-line ratios sensitive to total oxygen abundance, nitrogen-to-oxygen ratio, and ionization parameter with the predictions from a large grid of photoionization models calculated under the most usual conditions in this environment. We applied our method to a sample of Seyfert 2 galaxies with optical emission-line fluxes and determinations of their chemical properties from detailed models in the literature. Our results agree within the errors with other results and confirm the high metallicity of the objects of the sample, with N/O values consistent with a large secondary production of N, but with a large dispersion. The obtained ionization parameters for this sample are much larger than those for star-forming object at the same metallicity.
format Articulo
Preprint
author Pérez Montero, Enrique
Dors, Oli L.
Vílchez, José M.
García Benito, R.
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
author_facet Pérez Montero, Enrique
Dors, Oli L.
Vílchez, José M.
García Benito, R.
Cardaci, Mónica Viviana
Hägele, Guillermo Federico
author_sort Pérez Montero, Enrique
title A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
title_short A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
title_full A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
title_fullStr A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
title_full_unstemmed A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
title_sort bayesian-like approach to derive chemical abundances in type-2 active galactic nuclei based on photoionization models
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/125484
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