Zobrazeno 1 - 10
of 3 881
pro vyhledávání: '"Cardaci, M."'
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
Autor:
Oliveira Jr., C. B., Krabbe, A. C., Dors Jr., O. L., Zinchenko, I. A., Hernandez-Jimenez, J. A., Cardaci, M. V., Hägele, G. F., Ilha, G. S.
In this work, we investigated the nitrogen and oxygen abundances in a sample of galaxies with Low Ionization Nuclear Emission Regions (LINERs) in their nucleus. Optical spectroscopic data (3 600 - 10 000 {\AA}) of 40 LINERs from the Mapping Nearby Ga
Externí odkaz:
http://arxiv.org/abs/2404.16631
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., Riffel, R. A., Riffel, R., Cardaci, M. V., Hägele, G. F., Armah, M., Revalski, M., Flury, S. R., Freitas-Lemes, P., Amôres, E. B., Krabbe, A. C., Binette, L., Feltre, A., Storchi-Bergmann, T.
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 SDSS
Externí odkaz:
http://arxiv.org/abs/2302.12876
Autor:
Oliveira Jr., C. B., Krabbe, A. C., Hernandez-Jimenez, J. A., Dors Jr., O. L., Zinchenko, I. A., Hägele, G. F., Cardaci, M. V., Monteiro, A. F.
The ionizing source of Low Ionization Nuclear Emission Regions (LINERs) is uncertain. Because of this, an empirical relation to determine the chemical abundances of these objects has not been proposed. In this work, for the first time, we derived two
Externí odkaz:
http://arxiv.org/abs/2207.10260
Autor:
Armah, Mark, Dors, O. L., Aydar, C. P., Cardaci, M. V., Hagele, G. F., Feltre, Anna, Riffel, R., Riffel, R. A., Krabbe, A. C.
For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert~2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines for 35 Seyfert 2 nuclei in the
Externí odkaz:
http://arxiv.org/abs/2109.04596
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:
Riffel, R. A., Dors, O. L., Armah, M., Storchi-Bergmann, T., Feltre, A., Hagele, G. F., Cardaci, M. V., Ruschel-Dutra, D., Krabbe, A. C, Perez-Montero, E., Zakamska, N. L., Freitas, I. C.
We present maps for the electron temperature in the inner kpc of three luminous Seyfert galaxies: Mrk 79, Mrk 348, and Mrk 607 obtained from Gemini GMOS-IFU observations at spatial resolutions of 110-280 pc. We study the distributions of electron tem
Externí odkaz:
http://arxiv.org/abs/2012.02013
Autor:
Dors, O. L., Contini, M., Riffel, R. A., Perez-Montero, E., Krabbe, A. C., Cardaci, M. V., Hagele, G. F.
We build detailed composite models of photoionization and shock ionization based on the SUMA code to reproduce emission lines emitted from the Narrow Line Regions (NLR) of Seyfert 2 nuclei. The aim of this work is to investigate diagram AGN positions
Externí odkaz:
http://arxiv.org/abs/2011.12103