Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks

We build detailed composite models of photoionization and shock ionization based on the SUMA code to reproduce emission lines emitted from the Narrow Line Regions (NLR) of Seyfert 2 nuclei. The aim of this work is to investigate diagram AGN positions according to shock parameters, shock effects on t...

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Detalles Bibliográficos
Autores principales:	Dors, Oli L., Contini, Marcella, Riffel, Rogemar A., Pérez-Montero, Enrique, Krabbe, Angela, Cardaci, Mónica Viviana, Hägele, Guillermo Federico
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2020
Materias:	Ciencias Astronómicas Galaxies: abundances Galaxies: active Galaxies: evolution Galaxies: formation Galaxies: ISM Galaxies: nuclei Galaxies: Seyfert
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125594
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125594
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: abundances Galaxies: active Galaxies: evolution Galaxies: formation Galaxies: ISM Galaxies: nuclei Galaxies: Seyfert
spellingShingle	Ciencias Astronómicas Galaxies: abundances Galaxies: active Galaxies: evolution Galaxies: formation Galaxies: ISM Galaxies: nuclei Galaxies: Seyfert Dors, Oli L. Contini, Marcella Riffel, Rogemar A. Pérez-Montero, Enrique Krabbe, Angela Cardaci, Mónica Viviana Hägele, Guillermo Federico Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
topic_facet	Ciencias Astronómicas Galaxies: abundances Galaxies: active Galaxies: evolution Galaxies: formation Galaxies: ISM Galaxies: nuclei Galaxies: Seyfert
description	We build detailed composite models of photoionization and shock ionization based on the SUMA code to reproduce emission lines emitted from the Narrow Line Regions (NLR) of Seyfert 2 nuclei. The aim of this work is to investigate diagram AGN positions according to shock parameters, shock effects on the gas temperature and ionization structures and derive a semi-empirical abundance calibration based on emission-line ratios little sensitive to the shock presence. The models were used to reproduce optical (3000 < λ(Å) < 7000) emission line intensities of 244 local (z ≲ 0.4) Seyfert 2s, whose observational data were selected from Sloan Digital Sky Survey DR7. Our models suggest that shocks in Seyfert 2 nuclei have velocities in the range of 50-300 km/s and imply a narrower metallicity range (0.6≲(Z/Z⊙)≲1.6) than those derived using pure photoionization models. Our results indicate that shock velocity in AGNs can not be estimated using standard optical line ratio diagrams, based on integrated spectra. Our models predict a different temperature structure and O⁺/O and O²⁺/O fractional abundances throughout the NLR clouds than those derived from pure photoionization models, mainly in shock-dominated objects. This suggests that, in order to minimize the shock effects, the combination of emission-lines emitted by ions with similar intermediate ionization potential could be good metallicity indicators. Finally, we derive two calibrations between the N/O abundance ratio and the N₂O₂=log([N II]λ6584/[O II]3727) and N₂=log([N II]λ6584/Hα) indexes which agree with that derived from pure photoionization models.
format	Articulo Preprint
author	Dors, Oli L. Contini, Marcella Riffel, Rogemar A. Pérez-Montero, Enrique Krabbe, Angela Cardaci, Mónica Viviana Hägele, Guillermo Federico
author_facet	Dors, Oli L. Contini, Marcella Riffel, Rogemar A. Pérez-Montero, Enrique Krabbe, Angela Cardaci, Mónica Viviana Hägele, Guillermo Federico
author_sort	Dors, Oli L.
title	Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
title_short	Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
title_full	Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
title_fullStr	Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
title_full_unstemmed	Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
title_sort	chemical abundances of seyfert 2 agns – iv. composite models calculated by photoionization + shocks
publishDate	2020
url	http://sedici.unlp.edu.ar/handle/10915/125594
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bdutipo_str	Repositorios
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Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks

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