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- W2009971504 abstract "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. 29 refs." @default.
- W2009971504 created "2016-06-24" @default.
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- W2009971504 date "1990-10-01" @default.
- W2009971504 modified "2023-09-27" @default.
- W2009971504 title "Models for stratified photoionized clouds in AGN. I - General properties of the emission-line spectrum" @default.
- W2009971504 doi "https://doi.org/10.1086/115578" @default.
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