Navegação Ciências Exatas e da Terra por Autor "Viegas, Sueli Maria Marino"
Resultados 1-5 de 5
-
Infrared Fe II emission in narrow-line Seyfert 1 galaxies
(2002) [Artigo de periódico]We obtained 0.8-2.4 μm spectra at a resolution of 320 km s-ˡ of four narrow-line Seyfert 1 galaxies in order to study the near-infrared properties of these objects. We focus on the analysis of the Fe II emission in that ... -
Molecular hydrogen and [Fe II] in active galactic nuclei
(2004) [Artigo de periódico]Near-infrared spectroscopy is used to study the kinematics and excitation mechanisms of H2 and [Fe II] lines in a sample of mostly Seyfert 1 galaxies. The spectral coverage allows simultaneous observation of the JHK bands, ... -
Near-infrared coronal lines in narrow-line Seyfert 1 galaxies
(2002) [Artigo de periódico]We report spectroscopic observations in the wavelength region 0.8–2.4 μm aimed at detecting near-infrared coronal lines in a sample of five narrow-line and one broad-line Seyfert 1 galaxies. Our measurements show that [Si ... -
On warmers as the ionizing source in active galactic nuclei
(1992) [Artigo de periódico]The aim of this paper is to study in detail the Terlevich & Melnick starburst-warmers scenario for type 2 Seyferts and LINERs, which postulates a young cluster containing stars with temperatures about 150 000 K as the ... -
The O [iota] line emission in active galactic nuclei revisited
(2002) [Artigo de periódico]UV, visible, and near-infrared spectroscopy is used to study the transitions of neutral oxygen leading to the emission of broad O i λ8446, λ11287, and λ1304 in active galactic nuclei. From the strength of the former two ...
