Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines
For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert 2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines for 35 Seyfert 2 nuclei in the local universe (z < ∼ 0.06). The relative...
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Autores principales: | , , , , , , , , |
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Formato: | Articulo Preprint |
Lenguaje: | Inglés |
Publicado: |
2021
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/146744 |
Aporte de: |
id |
I19-R120-10915-146744 |
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record_format |
dspace |
institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Astronomía galaxies: active galaxies: abundances galaxies: evolution galaxies: nuclei galaxies: ISM galaxies: Seyfert ISM: abundances |
spellingShingle |
Astronomía galaxies: active galaxies: abundances galaxies: evolution galaxies: nuclei galaxies: ISM galaxies: Seyfert ISM: abundances Armah, Mark Dors, Oli L. Aydar, C. P. Cardaci, Mónica Viviana Hägele, Guillermo Federico Feltre, Anna Riffel, R. A. Riffel, Rogério Krabbe, A. C. Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines |
topic_facet |
Astronomía galaxies: active galaxies: abundances galaxies: evolution galaxies: nuclei galaxies: ISM galaxies: Seyfert ISM: abundances |
description |
For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert 2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines for 35 Seyfert 2 nuclei in the local universe (z < ∼ 0.06). The relative intensities of emission lines were used to derive the ionic and total neon and oxygen abundances through electron temperature estimations (Te-method). For the neon, abundance estimates were obtained by using both Te-method and IR-method. Based on photoionization model results, we found a lower electron temperature [te(Ne iii)] for the gas phase where the Ne2+ is located in comparison with t3 for the O2+ ion. We find that the differences (D) between Ne2+/H+ ionic abundances calculated from IR-method and Te−method (assuming t3 in the Ne2+/H+ derivation) are similar to the derivations in star-forming regions (SFs) and they are reduced by a mean factor of ∼ 3 when te(Ne iii) is considered. We propose a semiempirical Ionization Correction Factor (ICF) for the neon, based on [Ne ii]12.81µm, [Ne iii]15.56µm and oxygen ionic abundance ratios. We find that the average Ne/H abundance for the Seyfert 2s sample is nearly 2 times higher than similar estimate for SFs. Finally, for the very high metallicity regime (i.e. [12 + log(O/H) > ∼ 8.80]) an increase in Ne/O with O/H is found, which likely indicates secondary stellar production for the neon. |
format |
Articulo Preprint |
author |
Armah, Mark Dors, Oli L. Aydar, C. P. Cardaci, Mónica Viviana Hägele, Guillermo Federico Feltre, Anna Riffel, R. A. Riffel, Rogério Krabbe, A. C. |
author_facet |
Armah, Mark Dors, Oli L. Aydar, C. P. Cardaci, Mónica Viviana Hägele, Guillermo Federico Feltre, Anna Riffel, R. A. Riffel, Rogério Krabbe, A. C. |
author_sort |
Armah, Mark |
title |
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines |
title_short |
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines |
title_full |
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines |
title_fullStr |
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines |
title_full_unstemmed |
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines |
title_sort |
chemical abundances in seyfert galaxies – vii. direct abundance determination of neon based on optical and infrared emission lines |
publishDate |
2021 |
url |
http://sedici.unlp.edu.ar/handle/10915/146744 |
work_keys_str_mv |
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bdutipo_str |
Repositorios |
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1764820461591461888 |