Mathematics – Probability
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..752n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 15, 1985, p. 752-762.
Mathematics
Probability
49
Active Galaxies, Emission Spectra, Fluorescence, Galactic Nuclei, Helium Ions, Lyman Alpha Radiation, Nebulae, Active Galactic Nuclei, Doppler Effect, Monte Carlo Method, Radiative Transfer
Scientific paper
It is pointed out that emission lines of ionized helium are among the most important diagnostic indicators in the spectrum of active galactic nuclei (AGNs) and other types of gaseous nebulae. Certain difficulties in some investigations are related to the line-continuum overlap problem. In this paper, a new formalism is introduced for handling this problem. The employed technique represents a pure 'escape probability method', involving only the solution of the (nonlinear) level population algebraic equations. The relevant expressions have been incorporated into existing photoionization codes which were utilized to investigate the general problem of ionization and excitation of He II, O III, and N III in gaseous nebulae, giving particular attention to AGN conditions. The new results are presented for ionization and line intensities under a large range of physical conditions, and the arising implications for models of AGNs and other gaseous nebulae are discussed.
Elitzur Moshe
Ferland Gary J.
Netzer Hagai
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