Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362...74s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 74-89. Research supported by the University of Calif
Astronomy and Astrophysics
Astrophysics
12
Electron Photon Cascades, Galactic Nuclei, Line Spectra, Nitrogen Ions, Oxygen Spectra, Seyfert Galaxies, Binary Stars, Electron Density (Concentration), Neutron Stars, X Ray Sources
Scientific paper
New observations of the O III and N III Bowen fluorescence lines in a sample of two Seyfert 2 nuclei and six Seyfert 1 nuclei with relatively narrow permitted lines are discussed. Included are new measurements of O III 3133, 3444 A, which are the two strongest cascades produced in the Bowen process, and possible detections of O III 3341A, a secondary cascade expected to be produced following emission of a 3133 A photon. Measurements of the forbidden S II and forbidden O III lines are used to estimate densities for the program objects. The flux-calibrated spectra and the Bowen yields, together with the derived electron densities, are used to construct a model spherical Bowen-emitting region.
Filippenko Alexei V.
Kahn Steven M.
Schachter Jonathan
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