| Texto completo | |
| Autor(es): Mostrar menos - |
Dors, Oli L.
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Valerdi, M.
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Riffel, R. A.
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Riffel, R.
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Cardaci, M., V
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Hagele, G. F.
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Armah, Mark
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Revalski, M.
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Flury, S. R.
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Freitas-Lemes, P.
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Amores, E. B.
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Krabbe, A. C.
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Binette, L.
;
Feltre, A.
;
Storchi-Bergmann, T.
Número total de Autores: 15
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| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 521, n. 2, p. 19-pg., 2023-05-01. |
| Resumo | |
For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line intensities from the Sloan Digital Sk y Survey (SDSS) Data Release 17 (DR17) [in the wav elength range 3000 < lambda( angstrom) < 9100] and from the literature for a sample of 45 nearby ( z < 0.08) Sy 2s were considered. Our direct estimates indicate that Sy 2s have similar temperatures in the gas region where most of the S (+) ions are located in comparison with that of star-forming regions (SFs). Ho we ver, Sy 2s present higher temperature values (similar to 10 000 K) in the region where most of the S2+ ions are located relative to that of SFs. We derive the total sulphur abundance in the range of 6.2 less than or similar to 12 + log (S / H) less than or similar to 7 . 5, corresponding to 0.1-1.8 times the solar value. These sulphur abundance values are lower by similar to 0.4 dex than those derived in SFs with similar metallicity, indicating a distinct chemical enrichment of the interstellar medium (ISM) for these object classes. The sulphur abundance relative to oxygen (S/O) values for our Sy 2 sample present an abrupt ( similar to 0.5 dex) decrease with increasing oxygen abundance relative to hydrogen (O/H) for the high-metallicity regime [12 + log (O / H)greater than or similar to 8 .7)], what is not seen for the SFs. Ho we ver, when our Sy 2 estimates are combined with those from a large sample of SFs, we did not find any dependence between S/O and O/H. (AU) | |
| Processo FAPESP: | 20/16416-5 - Galáxias em interação: novo catálogo com dados do survey S-Plus e caracterização das propriedades físicas com dados do Survey MaNGA |
| Beneficiário: | Angela Cristina Krabbe |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |