Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..393g&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, June 1984, p. 393-397.
Astronomy and Astrophysics
Astronomy
87
Active Galactic Nuclei, H Lines, Ratios, Seyfert Galaxies, Spectral Line Width, Astronomical Models, Electron Density (Concentration), H Alpha Line, H Beta Line, Lyman Alpha Radiation, Molecular Clouds, Paschen Series, Quasars, Radiative Transfer
Scientific paper
The authors present calculations of the relative strengths of Lα, Hα, Hβ, Hγ, and Pα for low-density gas clouds photoionized by a continuum such as might be found in active galactic nuclei. They confirm the finding of Halpern (1982) that the Hα/Hβ ratio is insensitive to the ionization parameter. The ratio also depends only weakly on the electron density. Hα/Hβ is mostly a function of metallicity and the shape of the UV to X-ray continuum. It is recommended that Hα/Hβ should be "reinstated" as an indicator of reddening for the narrow-line regions of active galaxies, but with an assumed intrinsic value of about 3.0, as proposed by Halpern, rather than the previous case B value of 2.85.
Ferland Gary J.
Gaskell Martin C.
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