Artículo
New metallicity calibration for Seyfert 2 galaxies based on the N2O2 index
Fecha de publicación:
01/2017
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We derive a new relation between the metallicity of Seyfert 2 active galactic nuclei (AGNs) and the intensity of the narrow emission-lines ratio N2O2 = log([N II] λ6584/[O II] λ3727). The calibration of this relation was performed by determining the metallicity (Z) of a sample of 58 AGNs through a diagram containing the observational data and the results of a grid of photoionization models obtained with the CLOUDY code. We find the new Z/Z⊙-N2O2 relation using the obtained metallicity values and the corresponding observational emissionline intensities for each object of the sample. Estimations derived through the use of this new calibration indicate that the narrow-line regions of Seyfert 2 galaxies exhibit a large range of metallicities (0.3 ≲ Z/Z⊙ ≲ 2.0), with a median value Z ≈ Z⊙. Regarding the possible existence of correlations between the luminosity L(Hβ), the electron density and the colour excess E(B-V) with themetallicity in this kind of objects, we do not find correlations between them.
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Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Castro, C.S.; Dors, O.L.; Cardaci, Monica Viviana; Hägele, G.F.; New metallicity calibration for Seyfert 2 galaxies based on the N2O2 index; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 467; 2; 1-2017; 1507-1514
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