Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..351d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 351-361.
Astronomy and Astrophysics
Astrophysics
16
Emission Spectra, H Ii Regions, Interstellar Matter, Line Spectra, Seyfert Galaxies, Continuous Radiation, Ionized Gases, Physical Properties, Ultraviolet Radiation
Scientific paper
A physical interpretation is given to long-slit spectroscopic data for 16 extended ionized envelopes surrounding different types of AGN presented in a previous paper. Ionization mechanisms are discussed, comparing reddened emission line ratios to published hot-ionization and shock ionization models. High ionization emission lines can be accounted for by photoionization by a nonstellar UV continuum, while low-ionization emission lines are better accounted for when shocks are included. Detailed physical properties are derived for a number of extranuclear regions show that the gas is always clumpy with typical filling factors of a few 0.01. A correlation is found between the maximum extent of the ionized gas and the UV luminosity at the Lyman limit. For a large sample of nebulosities gathered from the literature, correlations are found between phi(max) and the absolute magnitude and between phi(max) and the radio power.
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