Are the narrow-line regions of active galactic nuclei optically thick?

Details Are the narrow-line regions of active galactic nuclei optically thick? Are the narrow-line regions of active galactic nuclei optically thick?

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330l...9v&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 330, July 1, 1988, p. L9-L12.

Other

18

Active Galactic Nuclei, H Beta Line, Line Spectra, Optical Thickness, Seyfert Galaxies, Emission Spectra, Planetary Nebulae

Scientific paper

The possibility of the narrow-line region (NLR) of AGN being optically thin to the hydrogen Lyman continuum is discussed. It is shown that, for a large sample of AGN, as the He II/H-beta ratio increases the low-excitation line ratios decrease, also indicating that the NLRs have different optical depths to the hydrogen Lyman continuum. Some NLRs are radiation-bounded, others are matter-bounded. This implies that attempts to fit an average emission-line spectrum by lumping together observations of several objects are not realistic, and that any claim concerning the shape of the ionizing radiation spectrum obtained using optically thick models for the NLR should be reconsidered.

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