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dc.contributor.author
Dors, O.L.
dc.contributor.author
Contini, M.
dc.contributor.author
Riffel, R.A.
dc.contributor.author
Pérez Montero, E.
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Krabbe, A.C.
dc.contributor.author
Cardaci, Monica Viviana
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dc.contributor.author
Hägele, Guillermo Federico
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dc.date.available
2021-10-28T14:28:20Z
dc.date.issued
2021-02
dc.identifier.citation
Dors, O.L.; Contini, M.; Riffel, R.A.; Pérez Montero, E.; Krabbe, A.C.; et al.; Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 501; 1; 2-2021; 1370-1383
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/145324
dc.description.abstract
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 active galactic nucleus (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 kms−1 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 cannot 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]λ3727) and N2 = log([N II]λ6584/H α) indexes which agree with that derived from pure photoionization models.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
GALAXIES: ABUNDANCES
dc.subject
GALAXIES: ACTIVE
dc.subject
GALAXIES: EVOLUTION
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GALAXIES: FORMATION
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GALAXIES: ISM
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GALAXIES: NUCLEI
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GALAXIES: SEYFERT
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-07-01T14:23:27Z
dc.identifier.eissn
1365-2966
dc.journal.volume
501
dc.journal.number
1
dc.journal.pagination
1370-1383
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Oxford
dc.description.fil
Fil: Dors, O.L.. Universidade Do Vale Do Paraiba; Brasil
dc.description.fil
Fil: Contini, M.. Universitat Tel Aviv; Israel
dc.description.fil
Fil: Riffel, R.A.. Universidade Federal de Santa Maria; Brasil
dc.description.fil
Fil: Pérez Montero, E.. Instituto de Astrofísica de Andalucía; España
dc.description.fil
Fil: Krabbe, A.C.. Universidade Do Vale Do Paraiba; Brasil
dc.description.fil
Fil: Cardaci, Monica Viviana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.description.fil
Fil: Hägele, Guillermo Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
dc.journal.title
Monthly Notices of the Royal Astronomical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-abstract/501/1/1370/6012836?redirectedFrom=fulltext
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/staa3707
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