Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..453g&link_type=abstract
IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr
Astronomy and Astrophysics
Astrophysics
2
Astronomical Spectroscopy, Emission Spectra, Iron, Quasars, Atomic Spectra, Wavelengths
Scientific paper
It is pointed out that broad, complex blends of Fe II emission lines are a common feature of the spectra of quasars and Seyfert 1 galaxies, both in the optical and in the ultraviolet. Studies have demonstrated that the observed Fe II emission can be generally explained by a model in which a very optically thick portion of the X-ray energized extended transition region of a quasar broad emission line cloud is collisionally excited by electrons. Yet, a detailed comparison by Grandi (1981) of the ultraviolet Fe II blends predicted by the considered models to actual quasar spectra revealed a notable lack of agreement. It was suggested by Grandi that future models for Fe II emission in quasars must utilize a much more extensive model atom than previous analyses. The present investigation is concerned with preliminary results of such a model.
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