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A new tool to derive chemical abundances in type-2 active galactic nuclei

Published online by Cambridge University Press:  29 January 2021

Rubén García-Benito ,
Enrique Pérez-Montero ,
Oli L. Dors ,
José M. Vlchez ,
Monica V. Cardaci  and
Guillermo F. Hägele
Rubén García-Benito
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado de correos 3004, E-18080 Granada, Spain emails: rgb@iaa.es, epm@iaa.es
Enrique Pérez-Montero
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado de correos 3004, E-18080 Granada, Spain emails: rgb@iaa.es, epm@iaa.es
Oli L. Dors
Affiliation:
Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, Cep 12244-000, São José dos Campos, SP, Brazil
José M. Vlchez
Affiliation:
Instituto de Astrofísica de Andalucía, Apartado de correos 3004, E-18080 Granada, Spain emails: rgb@iaa.es, epm@iaa.es
Monica V. Cardaci
Affiliation:
Instituto de Astrofísica de La Plata (CONICET-UNLP), Argentina Facultad de Ciencias Astronómicas y Geofsicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
Guillermo F. Hägele
Affiliation:
Instituto de Astrofísica de La Plata (CONICET-UNLP), Argentina Facultad de Ciencias Astronómicas y Geofsicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina
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We present a new tool for the analysis of the optical emission lines of the gas in the Narrow Line Region (NLR) around Active Galactic Nuclei (AGNs). This new tool can be used in large samples of objects in a consistent way using different sets of optical emission-lines taking into the account possible variations from the O/H - N/O relation. The code compares certain observed emission-line ratios with the predictions from a large grid of photoionization models calculated under the most usual conditions in the NLR of AGNs to calculate the total oxygen abundance, nitrogen-to-oxygen ratio and ionization parameter. We applied our method to a sample of Seyfert 2 galaxies with optical emission-line fluxes from the literature. Our results confirm the high metallicity of the objects of the sample and provide consistent values with the direct method. The usage of models to calculate precise ICFs is mandatory when only optical emission lines are available to derive chemical abundances using the direct method in NLRs of AGN.

Keywords

methods: data analysisISM: abundancesgalaxies: abundancesgalaxies: activegalaxies: Seyfert
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 61 - 65
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

References

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