Broad-line variability in NGC 5548

Details Broad-line variability in NGC 5548 Broad-line variability in NGC 5548

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..523k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 523-529.

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7

Active Galactic Nuclei, H Beta Line, Line Spectra, Molecular Clouds, Seyfert Galaxies, Spectrum Analysis, Computational Astrophysics, Emission Spectra, Velocity Distribution

Scientific paper

The possible explanations for the variability behavior of the He II 4686A and H-beta lines in the Seyfert galaxy NGC 5548 as observed by Peterson and Ferland (1986) are discussed. The range of variability expected from these lines is explored according to the standard models for broad-line clouds, assuming changes in the values of various of the clouds' defining parameters. When compared with model predictions, the observed line variability suggests the existence of a strong, variable EUV component of the ionizing spectrum and of two populations of clouds which differ in their velocity distributions and in their response to continuum variations.

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