136 citations · 760 across the 27 of their papers we have counts for
27 papers
Outflows of very ionized gas in the center of Seyfert galaxies: kinematics and physical conditions
Alberto Rodriguez-Ardila, M. A. Prieto, S. Viegas +1
Mid-resolution spectra are used to deduce the size and kinematics of the coronal gas in a sample of Seyfert galaxies by means of observations of the [FeXI], [FeX], [FeVII], [SiVI]…
Slit Observations and Empirical Calculations for HII Regions
I. F. Fernandes, R. Gruenwald, S. M. Viegas
When analysing HII regions, a possible source of systematic error on empirically derived physical quantities is the limited size of the slit used for the observations. A grid of ph…
Extended Coronal Emission Lines in Active Galactic Nuclei
A. Rodriguez-Ardila, A. Prieto, S. M. Viegas
VLT and NTT spectra are used to examine the nuclear and extended coronal line emission in a sample of well-known Seyfert 1 and 2 galaxies. The excellent spatial resolution obtained…
Molecular Hydrogen and [FeII] in Active Galactic Nuclei
Alberto Rodriguez-Ardila, Miriani G. Pastoriza, Sueli Viegas +2
(Abridge) Near-infrared spectroscopy is used to study the kinematics and excitation mechanisms of the H2 and [FeII] gas in a sample of AGN. The H2 lines are unresolved in all objec…
The Infrared-X-ray continuum correlation in Active Galactic Nuclei
M. Contini, S. M. Viegas, P. E. Campos
The correlation between the soft X-ray and near infrared emission from AGN is analysed using composite models by the code SUMA. We find new evidences for differences in ranges of p…
UV Continuum, Physical Conditions and Filling Factor in Active Galactic Nuclei
Lucimara P. Martins, Sueli M. Viegas, Ruth Gruenwald
The narrow line region of active galaxies is formed by gas clouds surrounded by a diluted gas. Standard one-dimensional photoionization models are usually used to model this region…