NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T21:30:48 PDT
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For refcode 2015MNRAS.453.4102D:
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NED Abstract

Copyright by Royal Astronomical Society. 2015MNRAS.453.4102D On the central abundances of active galactic nuclei and star-forming galaxies Dors, O. L.; Cardaci, M. V.; Hagele, G. F.; Rodrigues, I.; Grebel, E. K.; Pilyugin, L. S.; Freitas-Lemes, P.; Krabbe, A. C. Abstract. We examine the relation between oxygen abundances in the narrow-line regions (NLRs) of active galactic nuclei (AGNs) estimated from the optical emission lines through the strong-line method, via the direct T_e_-method, and the central intersect abundances in the host galaxies determined from the radial abundance gradients. We found that the T_e_-method underestimates the oxygen abundances by up to ~2 dex (with averaged value of ~0.8 dex) compared to the abundances derived through the strong-line method. This confirms the existence of the so-called 'temperature problem' in AGNs. We also found that the abundances in the centres of galaxies obtained from their spectra trough the strong-line method are close to or slightly lower than the central intersect abundances estimated from the radial abundance gradient both in AGNs and star-forming galaxies. The oxygen abundance of the NLR is usually lower than the maximum attainable abundance in galaxies (~2 times the solar value). This suggests that there is no extraordinary chemical enrichment of the NLRs of AGNs. Key words: galaxies: abundances, galaxies: evolution, galaxies: formation, galaxies: general, galaxies: ISM
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