info:eu-repo/semantics/article
Chemical abundances of Seyfert 2 AGNs, II: N2 metallicity calibration based on SDSS
Fecha
2020-06Registro en:
Carvalho, S.P.; Dors, O. L.; Cardaci, Monica Viviana; Hägele, Guillermo Federico; Krabbe, Nora Cristina; et al.; Chemical abundances of Seyfert 2 AGNs, II: N2 metallicity calibration based on SDSS; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 492; 4; 6-2020; 5675-5683
0035-8711
CONICET Digital
CONICET
Autor
Carvalho, S.P.
Dors, O. L.
Cardaci, Monica Viviana
Hägele, Guillermo Federico
Krabbe, Nora Cristina
Pérez Montero, E.
Monteiro, A.F.
Armah, M.
Freitas Lemes, P.
Resumen
We present a semi-empirical calibration between the metallicity (Z) of Seyfert 2 active galactic nuclei and the N2 = log([N II]λ6584/H a) emission-line intensity ratio. This calibration was derived through the [OIII]λ5007/[O II]λ3727 versus N2 diagram containing observational data and photoionization model results obtained with the CLOUDY code. The observational sample consists of 463 confirmed Seyfert 2 nuclei (redshift z ≤ 0.4) taken from the Sloan Digital Sky Survey DR7 data set. The obtained Z-N2 relation is valid for the range 0.3 ≤ (Z/Z⊙) ≤ 2.0 that corresponds to -0.7 ≤ (N2) ≤ 0.6. The effects of varying the ionization parameter (U), electron density and the slope of the spectral energy distribution on the Z estimations are of the order of the uncertainty produced by the error measurements of N2. This result indicates the large reliability of our Z -N2 calibration. A relation between U and the [OIII]/[O II] line ratio, almost independent of other nebular parameter, was obtained.
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