| Texto completo | |
| Autor(es): Mostrar menos - |
Dors, O. L.
;
Cardaci, M., V
;
Hagele, G. F.
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Valerdi, M.
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Ilha, G. S.
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Oliveira, C. B.
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Riffel, R. A.
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Flury, S. R.
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Arellano-Cordova, K. Z.
;
Storchi-Bergmann, T.
;
Riffel, R.
;
Almeida, G. C.
;
Morais, I. N.
Número total de Autores: 13
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| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 534, n. 4, p. 15-pg., 2024-10-17. |
| Resumo | |
We derive the nitrogen and oxygen abundances in the narrow line regions (NLRs) of a sample of 38 local (z<0.4) Seyfert 2 nuclei. For that, we consider narrow optical emission line intensities and direct estimates of the electron temperatures (T-e-method). We obtain a new theoretical expression for the nitrogen ionization correction factor [ICF(N+)] for NLRs. Applying this new ICF, we unexpectedly find that NLRs and disc H ii regions exhibit similar ICF distributions. We find nitrogen abundances in the range 7.6<12+log(N/H)<8.6 (mean value 8.06 +/- 0.22) or 0.4<(N/N-circle dot)<4.7, in the metallicity regime 8.3<12+log(O/H)<9.0. Our results indicate that the dispersion in N/H abundance for a fixed O/H value in AGNs of similar to 0.2 dex agrees with that for disc H ii regions with similar metallicity. We show that Seyfert 2 nuclei follow a similar (N/O)-(O/H) relation to the one followed by star-forming objects. Finally, we find that active galaxies called as (..)nitrogen-loud(..) observed at very high redshift (z>5) show N/O values in consonance with those derived for local NLRs. This result indicates that the main star-formation event is completed in the early evolution stages of active galaxies. (AU) | |
| Processo FAPESP: | 22/11799-9 - Desvelando a natureza das galáxias red geyser |
| Beneficiário: | Gabriele da Silva Ilha |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 23/10182-0 - Determinação de metalicidade e abundâncias químicas em Núcleos Ativos de Galáxias (Projeto CADA) |
| Beneficiário: | Celso Benedito de Oliveira Junior |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |