The broad-line region of active galactic nuclei revisited

Details The broad-line region of active galactic nuclei revisited The broad-line region of active galactic nuclei revisited

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100.1041c&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Sept. 1988, p. 1041-1050.

Astronomy and Astrophysics

Astronomy

51

Active Galactic Nuclei, Astronomical Spectroscopy, Photoionization, Spectrum Analysis, Accretion Disks, Astronomical Models, Energy Budgets, Iron, Optical Thickness

Scientific paper

Broad emission lines which are the most characteristic features of active galactic nuclei and quasars can be separated into two distinct systems: the "high-ionization lines" (HIL) and "low-ionization lines" (LIL). HILs are emitted by low-pressure optically-thin "clouds" illuminated by a rather soft continuum radiation; LILs are produced by a high-pressure optically-thick medium, illuminated mainly by hard X-rays, possibly the outer region of an accretion disk. This recent version of the photoionization model of the broad-line region is still unable to provide a consistent explanation of the unusual intensities of the iron Fe II lines in strong optical Fe II emitters.

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