Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349...42m&link_type=abstract
In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 42-50 (SEE N85-20961 11-89)
Astronomy and Astrophysics
Astronomy
2
Active Galactic Nuclei, Radio Sources (Astronomy), Seyfert Galaxies, Ultraviolet Astronomy, Abundance, Chemical Composition, Emission Spectra, Line Spectra, Magellanic Clouds, Photoionization, Quasars, X Ray Analysis
Scientific paper
The extensive ultraviolet spectra of broad line active nuclei and the large body of X-ray photometry and spectroscopy of these objects and the constraints that these data place on the photoionization models of the broad emission line region (BLR) are considered. Many active galactic nuclei, in particular quasars and Seyfert I's, are characterized by strong, broad (full width 2000 km/sec), emission lines from permitted transitions in abundant elements. In the simplist models these lines originate in clouds located at some characteristic distance from the central ionizing source in a quasi-spherical distribution. While the dynamics of these clouds are quite important, the emphasis is on how to derive the observed line strengths and line ratios.
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