49 citations · 262 across the 14 of their papers we have counts for
12 papers · 1 filter
Cosmic evolution of the helium and oxygen abundances in type 2 Active Galactic Nuclei: Helium-loud AGNs
O. L. Dors, M. Armah, G. F. Hägele +14
We derive the helium and oxygen abundances in the Narrow Line Regions (NLRs) of 84 Active Galactic Nuclei (AGNs) spanning two redshift ranges: 65 objects at and 19…
Metallicity of Active Galactic Nuclei from ultraviolet and optical emission lines-II. Revisiting the metallicity calibration and its implications
O. L. Dors, C. B. Oliveira, M. V. Cardaci +7
In this study, a new semi-empirical calibration is proposed between ultraviolet emission lines (\ion{C}{iii}], \ion{C}{iv}, \ion{He}{ii}]) of…
Semi-empirical calibration of the oxygen abundance for LINER galaxies based on SDSS-IV MaNGA -- The case for strong and weak AGN
C. B. Oliveira, O. L. Dors, I. A. Zinchenko +5
In this paper, we present a semi-empirical calibration between the oxygen abundance and the emission-line ratio for Low Ionization Nuclear Emission Regions (LINERs). This rela…
Cosmic metallicity evolution of Active Galactic Nuclei: Implications for optical diagnostic diagrams
Oli L. Dors, M. V. Cardaci, G. F. Hagele +5
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 meta…
Chemical abundances in Seyfert galaxies -- VII. Direct abundance determination of neon based on optical and infrared emission lines
Mark Armah, O. L. Dors, C. P. Aydar +6
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…
Chemical abundances in Seyfert galaxies -- V. The discovery of shocked emission outside the AGN ionization axis
R. A. Riffel, O. L. Dors, M. Armah +9
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…
Chemical abundances of Seyfert 2 AGNs IV. Composite models calculated by photoionization + shocks
O. L. Dors, M. Contini, R. A. Riffel +4
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…
Chemodynamics of Green Pea galaxies -- I. Outflows and turbulence driving the escape of ionising photons and chemical enrichment
L. Hogarth, R. Amorín, J. M. Vílchez +6
We investigate the ionised gas kinematics, physical properties and chemical abundances of SDSS142947, a Green Pea galaxy at redshift z0.17 with strong, double-peak Ly e…
Chemical abundances of Seyfert 2 AGNs I. Comparing oxygen abundances from distinct methods using SDSS
O. L. Dors, P. Freitas-Lemes, E. B. Amores +6
We compare the oxygen abundance (O/H) of the Narrow Line Regions (NLRs) of Seyfert 2 AGNs obtained through strong-line methods and from direct measurements of the electron temperat…
A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
E. Pérez-Montero, O. L. Dors, J. M. Vílchez +3
We present a new methodology for the analysis of the emission lines of the interstellar medium in the Narrow Line Regions around type-2 Active Galactic Nuclei. Our aim is to provid…
Nature and chemical abundances of a sample of Lyman- emitter objects at high redshift
O. L. Dors, B. Agarwal, G. F. Hagele +5
We built a grid of photoionization models and compiled already available observational emission line intensities () of confirmed star formation…
Star Formation in HII Galaxies. Properties of the ionized gas
G. F. Hagele, A. I. Diaz, E. Terlevich +3
We propose a methodology to perform a self-consistent analysis of the physical properties of the emitting gas of HII galaxies adequate to the data that can be obtained with the XXI…