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Chemical abundances of Seyfert 2 AGNs - II. N2 metallicity calibration based on SDSS

AuthorsCarvalho, S. P.; Dors, O. L.; Cardaci, M. V.; Hägele, G. F.; Krabbe, A. C.; Pérez Montero, E. ; Monteiro, A. F.; Armah, M.; Freitas-Lemes, P.
KeywordsGalaxies: abundances
Galaxies: active
Galaxies: evolution
Galaxies: formation
Galaxies: ISM
Galaxies: nuclei
Issue Date2020
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 492(4): 5675-5683 (2020)
AbstractWe present a semi-empirical calibration between the metallicity (Z) of Seyfert 2 active galactic nuclei and the N2 = log([N HP.6584/11 cy) emission-line intensity ratio. This calibration was derived through the [0 m]..5007/[0 u[),3727 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 r< ( Z/Zo) 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 IOutj/[OIII line ratio, almost independent of other nebular parameter, was obtained.
Publisher version (URL)http://dx.doi.org/10.1093/mnras/staa193
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