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A new tool to derive chemical abundances in type-2 active galactic nuclei
- Source :
- Digital.CSIC. Repositorio Institucional del CSIC, instname
- Publication Year :
- 2021
- Publisher :
- Cambridge University Press, 2021.
-
Abstract
- 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<br />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.<br />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)
- Subjects :
- 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)
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Digital.CSIC. Repositorio Institucional del CSIC, instname
- Accession number :
- edsair.doi.dedup.....537931d47abcbcdad2fb6bd854288f24