Forbidden lines in quasars and active galaxies

Details Forbidden lines in quasars and active galaxies Forbidden lines in quasars and active galaxies

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l...5s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, July 1, 1978, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

3

Active Galaxies, Forbidden Bands, Galactic Radiation, Photoionization, Quasars, Radio Galaxies, Seyfert Galaxies, Emission Spectra, Metastable State, Photons, Ultraviolet Radiation

Scientific paper

This paper considers the effects of photoexcitation and photoionization from the metastable levels of ions in the high-radiation environments expected in the nuclei of Seyfert galaxies, broad-line radio galaxies, and quasars. Anomalous line ratios in the narrow-line components and the absence of forbidden lines in the broad-line components of these objects may result from proximity of the emitting region to the central UV source, and do not necessarily imply high electron densities. Detailed calculations are presented for the case of forbidden O III.

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