Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1046b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1046-1056. Research supported by the University of Toronto and NS
Astronomy and Astrophysics
Astronomy
7
Active Galactic Nuclei, Emission Spectra, Gas Ionization, Line Spectra, Molecular Clouds, Radio Galaxies, Astronomical Models, Density Distribution, Electron Density (Concentration), Photoionization
Scientific paper
Photoionization is considered a dominant excitation mechanism in AGN and photoionized clouds with strong internal density stratifications, which may be a result of gravitational/radiation pressure forces or of dynamical effects, are studied. Analytic and numerical calculations of plane-parallel photoionized clouds are compared; emission-line ratios for different density stratifications (with beta = 0.75, 1.0, and 2.0) are obtained. The stratified models show stronger ultraviolet emission lines than the similar isochoric or isobaric models and a weak dependence of the predicted line ratios on the impinging ionizing flux. They could provide an explanation of the spatial dependence of the emission-line spectrum of the extended extranuclear emitting gas in active galaxies.
Binette Luc
Raga Alejandro C.
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