Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238...10g&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, May 15, 1980, p. 10-16.
Astronomy and Astrophysics
Astrophysics
78
Astronomical Spectroscopy, Infrared Spectra, Oxygen Spectra, Seyfert Galaxies, Emission Spectra, Fluorescence, H Alpha Line, Line Spectra, Lyman Spectra
Scientific paper
Broad O I 8446 A emission is seen in 13 of 16 observed Seyfert 1 galaxies with strengths compared to H alpha ranging from 0.01 to 0.07. It is found that the excitation mechanism of O I 8446 A in Seyfert galaxies must be L beta pumping in a Bowen fluorescence process. Recent calculations (Ferland and Netzer, 1979; Kwan and Krolik, 1979) regarding radiative transfer show that deep within the cloud, where H and O are largely neutral, trapped L alpha photons will populate the n = 2 levels of H, and Balmer continuum ionization and collisional excitation by electrons, a result of ionizations by diffuse He radiation, will produce L beta photons. Calculations indicate that observed values of the (8446 A)/(H alpha) ratio can be reproduced in this manner.
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