136 citations · 760 across the 27 of their papers we have counts for
6 papers · 1 filter
Morphology and kinematics of Planetary Nebulae. I.A new modeling tool
C. Morisset, R. Gruenwald, S. M. Viegas
We present a new modeling tool for planetary nebulae, based on 3D photoionization calculations. Our goal is to show that all the information provided by observations, regarding kin…
On the ionizing continuum in active galactic nuclei: clues from ISO
M. Almudena Prieto, Sueli M. Viegas
The ISO coronal line spectrum of the brightest Seyfert galaxies from the CfA sample is presented and modeled. ISO observations of [O IV] 25.9 , [Ne V] 14.3 , [Mg VIII] 3.02 $…
Ionization Corrections For Low-Metallicity H II Regions and the Primordial Helium Abundance
S. M. Viegas, R. Gruenwald, G. Steigman
Helium and hydrogen recombination lines observed in low-metallicity, extragalactic H II regions provide the data used to infer the primordial helium mass fraction, Y_P. The ionizat…
Lyman alpha systems within hot galactic halos
Sueli M. Viegas, Amancio C. S. Friaca, Ruth Gruenwald
A hot gas halo is predicted by chemodynamical models during the early evolution of spheroidal galaxies. Cold condensations, arising from thermal instabilities in the hot gas, are e…
Infrared line ratios revealing starburst conditions in galaxies
Sueli M. Viegas, Marcella Contini, Thierry Contini
The physical conditions in typical starburst galaxies are investigated through critical infrared (IR) line ratios, as previously suggested by Lutz et al. (1998, A&A, 333, L75). The…
A Multi-Cloud Warm-Absorber Model for NGC 4051
M. Contini, S. M. Viegas
A multi-cloud model is presented which explains the soft X-ray excess in NGC 4051 and, consistently, the optical line spectrum and the SED of the continuum. The clouds are heated a…