Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...262..564f&link_type=abstract
Astrophysical Journal, Part 1, vol. 262, Nov. 15, 1982, p. 564-577.
Astronomy and Astrophysics
Astrophysics
132
Interstellar Gas, Line Spectra, Molecular Clouds, Seyfert Galaxies, X Ray Sources, Emission Spectra, Galactic Nuclei, H Ii Regions, Interstellar Extinction, Photoionization, Spectral Line Width, Stellar Winds
Scientific paper
A discussion is presented of the constraints imposed by X-ray, UV and optical observations on the absorbing material in the Seyfert 1.5 galaxy NGC 4151, comparing said observations with both photoionization model predictions of broad line region clouds and models of the narrow line region gas. The weakness of both semiforbidden C III 1909 and the broad component of H-alpha relative to C IV 1549, in conjunction with the absence of an absorption Balmer jump, indicate a broad line region ionization parameter that is greater in NGC 4151 than in QSO clouds by a factor of 30. The present calculations suggest that narrow line region clouds have a composition similar to extragalactic giant H II regions, with the H line spectrum showing that dust is mixed with narrow line region gas. It is hypothesized that broad line region clouds are likely to be in a radiatively driven wind, and it is shown that such clouds are opaque to radio emission.
Ferland Gary J.
Mushotzky Richard F.
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