Optically thin gas in the broad-line region of Seyfert galaxies

Details Optically thin gas in the broad-line region of Seyfert galaxies Optically thin gas in the broad-line region of Seyfert galaxies

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..713m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 713-728.

Astronomy and Astrophysics

Astrophysics

27

Cosmic Gases, Line Spectra, Seyfert Galaxies, Abundance, Emission Spectra, Lyman Beta Radiation, Optical Thickness, Spectral Line Width

Scientific paper

Profile comparisons between the H-alpha and O I 8446 emission lines in Seyfert galaxies are used to search for the presence of optically thin material in the broad-line region. In a sample of 12 objects with detected O I 8446, only four show significant profile differences. In the two clearest cases with profile differences, these can be explained as arising from an outflow of optically thin material. Also presented are high-resolutions spectra of a feature at 9210 A. It is suggested that Mg II pumped by a fluorescence with Ly-beta may be a significant contributor.

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