Repositório Digital

A- A A+

The O [iota] line emission in active galactic nuclei revisited

.

The O [iota] line emission in active galactic nuclei revisited

Mostrar registro completo

Estatísticas

Título The O [iota] line emission in active galactic nuclei revisited
Autor Rodriguez-Ardila, Alberto
Viegas, Sueli Maria Marino
Pastoriza, Miriani Griselda
Prato, Lisa A.
Donzelli, Carlos J.
Abstract 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 lines, contrary to the general belief, we found that in six of seven galaxies, Lyβ fluorescence is not the only mechanism responsible for the formation of these three lines. Because O i λ13165 is almost reduced to noise level, continuum fluorescence is ruled out as an additional excitation mechanism, but the presence of O i λ7774 in one of the objects suggests that collisional ionization may have an important role in the formation of O i λ8446. The usefulness of the O i lines as a reliable reddening indicator for the broad-line region is discussed. The values of E(B−V) derived from the λ1304/ λ8446 ratio agree with those obtained using other reddening indicators. The observations point toward a break in the one-to-one photon relation between λ8446 and λ1304, attributable to several destruction mechanisms that may affect the latter line.
Contido em The Astrophysical journal. Chicago. Vol. 572, no. 1, pt. 1 (June 2002), p. 94-104
Assunto Astronomia infravermelha
Astronomia ultravioleta
Espectros astronômicos
Galáxias ativas
Oxigenio
[en] Galaxies: nuclei
[en] Galaxies: seyfert
[en] Radiation mechanisms: thermal
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108906
Arquivos Descrição Formato
000320236.pdf (330.4Kb) Texto completo (inglês) Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.