Zobrazeno 1 - 10
of 103
pro vyhledávání: '"Oliveira, C B"'
Autor:
Dors, O. L., Almeida, G. C., Oliveira, C. B., Flury, S. R., Riffel, R., Riffel, R. A., Cardaci, M. V., Hägele, G. F., Ilha, G. S., Krabbe, A. C., Arellano-Córdova, K. Z., Santos, P. C., Morais, I. N.
For the first time, a calibration between the HeI $\lambda5876$/H$\beta$ emission line ratio and the helium abundance $y$=12+log(He/H) for Narrow line regions (NLRs) of Seyfert~2 Active Galactic Nuclei (AGN) is proposed. In this context, observationa
Externí odkaz:
http://arxiv.org/abs/2406.03259
Autor:
Dors, O. L., Cardaci, M. V., Hägele, G. F., Valerdi, M., Ilha, G. S., Oliveira, C. B., Riffel, R. A., Flury, S. R., Arellano-Córdova, K. Z., Storchi-Bergmann, T., Riffel, R., Almeida, G. C., Morais, I. N.
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 temperature
Externí odkaz:
http://arxiv.org/abs/2405.13906
Cosmic metallicity evolution of Active Galactic Nuclei: Implications for optical diagnostic diagrams
Autor:
Dors, Oli L., Cardaci, M. V., Hagele, G. F., Ilha, G. S., Oliveira, C. B., Riffel, R. A., Riffel, R., Krabbe, A. C.
We analyze the validity of optical diagnostic diagrams relying on emission-lines ratios and in the context of classifying Active Galactic Nuclei (AGNs) according to the cosmic metallicity evolution in the redshift range 0 < z < 11.2. In this regard,
Externí odkaz:
http://arxiv.org/abs/2311.14026
Autor:
Dors, O. L., Valerdi, M., Freitas-Lemes, P., Krabbe, A. C., Riffel, R. A., Amôres, E. B., Riffel, R., Armah, M., Monteiro, A. F., Oliveira, C. B.
For the first time, the helium abundance relative to hydrogen (He/H), which relied on direct measurements of the electron temperature, has been derived in the narrow line regions (NLRs) from a local sample of Seyfert 2 nuclei. In view of this, optica
Externí odkaz:
http://arxiv.org/abs/2206.09836
Autor:
Krabbe, A. C., Oliveira, C. B., Zinchenko, I. A., Hernández-Jiménez, J. A., Dors Jr., O. L., Hägele, G. F., Cardaci, M. V., Telles, N. R.
Chemical abundance determinations in Low-Ionization Nuclear Line Regions (LINERs) are especially complex and uncertain because the nature of the ionizing source of this kind of object is unknown. In this work, we study the oxygen abundance in relatio
Externí odkaz:
http://arxiv.org/abs/2105.02072
Autor:
Amorim, R. A. A.1 (AUTHOR), Oliveira, C. B.1 (AUTHOR), Oliveira Junior, O. L.1 (AUTHOR), Diniz, A. C.1 (AUTHOR), Jones, D. B.2 (AUTHOR), Rosado, J.3 (AUTHOR), Blanco, F.3 (AUTHOR), García, G.4 (AUTHOR), Brunger, M. J.2,5 (AUTHOR), Lopes, M. C. A.1 (AUTHOR) cristina.lopes@ufjf.br
Publikováno v:
European Physical Journal D (EPJ D). Sep2023, Vol. 77 Issue 9, p1-17. 17p.
Autor:
Dors, O L, Almeida, G C, Oliveira, C B, Flury, S R, Riffel, R, Riffel, R A, Cardaci, M V, Hägele, G F, Ilha, G S, Krabbe, A C, Arellano-Córdova, K Z, Santos, P C, Morais, I N
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters; Sep2024, Vol. 533 Issue 1, pL1-L5, 5p
Autor:
Oliveira, C B, Krabbe, A C, Dors, O L, Zinchenko, I A, Hernandez-Jimenez, J A, Cardaci, M V, Hägele, G F, Ilha, G S
Publikováno v:
Monthly Notices of the Royal Astronomical Society; Jun2024, Vol. 531 Issue 1, p199-212, 14p
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