A new tool to derive chemical abundances in type-2 active galactic nuclei
| Autor: | Guillermo F. Hägele, José M. Vílchez, R. García-Benito, O. L. Dors, Enrique Pérez-Montero, Mónica V. Cardaci |
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| Přispěvatelé: | Agencia Estatal de Investigación (España) |
| Rok vydání: | 2021 |
| Předmět: |
Seyfert [Galaxies]
Active galactic nucleus Galaxies: Seyfert active [Galaxies] Galaxies: abundances Metallicity Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences abundances [Galaxies] Photoionization Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics ISM: abundances Abundance (ecology) Methods: data analysis Ionization data analysis [Methods] Astrophysics::Galaxy Astrophysics Line (formation) Physics abundances [ISM] Direct method Astronomy and Astrophysics Galaxies: active Astrophysics - Astrophysics of Galaxies Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Nuclear Activity in Galaxies Across Cosmic Time, Proceedings of the conference held 7-11 October 2019 in Addis Ababa, Ethiopia. Edited by Mirjana Pović et al. Proceedings of the International Astronomical Union, Volume 356, pp. 61-65 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. Financial support from the State Agency for Research of the Spanish MCIU through the "Center of Excellence Severo Ochoa" award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709) |
| Databáze: | OpenAIRE |
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