71 citations · 368 across the 21 of their papers we have counts for
21 papers
Identifying AGNs from X-ray detectionsII: Metallicity calibrations for the and diagnostics
Mark Armah, O. L. Dors, Rogério Riffel +4
Emission-line ratios from ions with nearly identical ionization potentials offer a robust solution to the degeneracies inherent to traditional active galactic nuclei (AGNs) metalli…
Identifying AGNs from X-ray detections-I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter
Mark Armah, O. L. Dors, Rogério Riffel +4
We present the first semi-empirical strong-line calibrations to determine metallicity in Active Galactic Nuclei (AGNs) that use the directly observable X-ray luminosity (Lx) instea…
Direct estimates of nitrogen abundance for Seyfert 2 nuclei
O. L. Dors, M. V. Cardaci, G. F. Hägele +10
We derive the nitrogen and oxygen abundances in the Narrow Line Regions (NLRs) of a sample of 38 local () Seyfert~2 nuclei. For that, we consider narrow optical emis…
Chemical abundances of LINER galaxies -- Nitrogen abundance estimations
C. B. Oliveira, A. C. Krabbe, O. L. Dors +5
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 spectroscop…
A new tool to derive chemical abundances in Type-2 Active Galactic Nuclei
R. García-Benito, E. Pérez-Montero, O. L. Dors +3
We present a new tool for the analysis of the optical emission lines of the gas in the Narrow Line Region (NLR) around Active Galactic Nuclei (AGNs). This new tool can be used in l…
New metallicity calibration for Seyfert 2 galaxies based on the N2O2 index
C. S. Castro, O. L. Dors, M. V. Cardaci +1
We derive a new relation between the metallicity of Seyfert 2 Active Galactic Nuclei (AGNs) and the intensity of the narrow emission-lines ratio =log([N II]6584/[O II]3…
Effective temperature of ionizing stars of extragalactic HII regions
O. L. Dors, G. F. Hagelle, M. V. Cardaci +1
The effective temperature (Teff) of the radiation field of the ionizing star(s) of a large sample of extragalactic HII regions was estimated using the R= log([OII](3727)/[OIII]5007…
High velocity blue-shifted FeII absorption in the dwarf star-forming galaxy PHL293B: Evidence for a wind driven supershell?
R. Terlevich, E. Terlevich, G. Bosch +4
X-shooter and ISIS WHT spectra of the starforming galaxy PHL 293B also known as A2228-00 and SDSS J223036.79-000636.9 are presented in this paper. We find broad (FWHM = 1000km/s) a…
Interaction effects on galaxy pairs with Gemini/GMOS- I: Electron density
A. C. Krabbe, D. A. Rosa, O. L. Dors +5
We present an observational study about the impacts of the interactions in the electron density of \ion{H}{ii} regions located in 7 systems of interacting galaxies. The data consis…
Integral field spectroscopy of HII regions in M33
Jesús López-Hernández, Elena Terlevich, Roberto Terlevich +5
Integral field spectroscopy (IFS) is presented for star forming regions in M33. A central area of 300 x 500 pc^2 and the external HII region IC 132, at a galactocentric distance {\…
Circumnuclear star-forming regions in early type spiral galaxies: dynamical masses
G. F. Hagele, M. V. Cardaci, G. L. Bosch +3
We present the measurements of gas and stellar velocity dispersions in 17 circumnuclear star-forming regions (CNSFRs) and the nuclei of three barred spiral galaxies: NGC2903, NGC33…
High resolution spectroscopy of the BCD galaxy Haro 15: II. Chemodynamics
Guillermo F. Hagele, Veronica Firpo, Guillermo Bosch +2
We present a detailed study of the physical properties of the nebular material in four star-forming knots of the blue compact dwarf galaxy Haro 15. Using long-slit and echelle spec…
X-rays as dominant excitation mechanism of [Fe ii] and H2 emission lines in active galaxies
Oli L. Dors, Rogemar A. Riffel, Monica V. Cardaci +4
We investigate the excitation mechanisms of near-infrared [Fe ii] and H2 emission lines observed in Active Galactic Nuclei (AGNs). We built a photoionization model grid considering…
Analyzing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
O. L. Dors, Angela Krabbe, Guillermo F. Hagele +1
We analyze the reliability of oxygen abundances and ionization parameters obtained from different diagnostic diagrams. For this, we compiled from the literature observational emiss…
High resolution spectroscopy of the BCD galaxy Haro 15:I. Internal kinematics
Verónica Firpo, Guillermo Bosch, Guillermo F. Hägele +2
Using echelle spectroscopy, obtained at Las Campanas Observatory, we present a detailed study of the internal kinematics of the nebular material in multiple knots of the blue compa…
Abundance determination of multiple star-forming regions in the HII galaxy SDSS J165712.75+321141.4
Guillermo F. Hagele, Ruben Garcia-Benito, Enrique Perez-Montero +5
We analyze high signal-to-noise spectrophotometric observations acquired simultaneously with TWIN, a double-arm spectrograph, from 3400 to 10400 Åof three star-forming regions in t…
Giant HII Regions in NGC 7479 & NGC 6070
V. Firpo, G. Bosch, G. F. Hägele +1
We present new results from our search for Giant H\,{\sc ii} Regions in galaxies visible from the southern hemisphere. In this work we study two galaxies: NGC\,7479 and NGC\,6070.…
Disentangling the metallicity and star formation history of HII galaxies through tailor-made models
Enrique Perez-Montero, Ruben Garcia-Benito, Guillermo F. Hagele +1
We present a self-consistent study of the stellar populations and the ionized gas in a sample of 10 HII galaxies with, at least, four measured electron temperatures and a precise d…
Haro15: Is it actually a low metallicity galaxy?
V. Firpo, G. Bosch, G. Hagele +2
We present a detailed study of the physical properties of the nebular material in multiple knots of the blue compact dwarf galaxy Haro 15. Using long slit and echelle spectroscopy,…
Kinematics of gas and stars in circumnuclear star-forming regions of early type spirals
Guillermo F. Hagele, Angeles I. Diaz, Monica V. Cardaci +2
(Abbr.) We present high resolution (R~20000) spectra in the blue and the far red of cicumnuclear star-forming regions (CNSFRs) in three early type spirals (NGC3351, NGC2903 and NGC…
Properties of the ionized gas of circumnuclear star-forming regions in early type spirals
Angeles I. Diaz, Guillermo F. Hagele, Elena Terlevich +1
(Abbr.) A study of cicumnuclear star-forming regions (CNSFRs) in several early type spirals has been made in order to investigate their main properties: stellar and gas kinematics,…