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2021MNRAS.507..466D - Mon. Not. R. Astron. Soc., 507, 466-474 (2021/October-2)

Chemical abundances in Seyfert galaxies - VI. Empirical abundance calibration.

DORS O.L.

Abstract (from CDS):

We derived a bi-dimensional calibration between the emission-line ratios R23= ([ O II]λ3726 +λ3729 +[ O III]λ4959 + λ5007)/ Hβ, P=[([ O III]λ4959+λ5007)/ Hβ]/R23 and the oxygen abundance relative to hydrogen (O/H) in the gas phase of Seyfert 1 and 2 nuclei. In view of this, emission-line intensity ratios for a sample of objects taken from the Sloan Digital Sky Survey Data Release 7 measured by the MPA/JHU group and direct estimates of O/H based on Te-method, adapted for active galactic nuclei (AGNs), are considered. We find no variation of R23 observed along the radii of AGNs, which shows that this line ratio is a good oxygen abundance (O/H) indicator for the class of objects considered in this work. The derived O/H = f(R23, P) relation produces O/H values similar to estimations via Te-method in a wide range of metallicities [ 8.0 \: ≲\: 12+log(O/H) \: ≲\: 9.2]. Conversely to star-forming regions in the high-metallicity regime, R23 shows a positive correlation trend with O/H in AGNs. This indicates that the hardness of ionizing radiation is not affected by the metallicities in these objects or narrow-line regions are not significantly modified by changes in the spectral energy distribution due to metallicity variations.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): ISM: abundances - galaxies: abundances - galaxies: active - galaxies: evolution - galaxies: nuclei - galaxies: Seyfert

Simbad objects: 4

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