Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..350h&link_type=abstract
Astronomy and Astrophysics, vol. 79, no. 3, Nov. 1979, p. 350-353.
Astronomy and Astrophysics
Astrophysics
29
Active Galaxies, Emission Spectra, Forbidden Bands, Oxygen Spectra, Quasars, Seyfert Galaxies, Brightness Temperature, Broadband, Density Distribution, Line Spectra, Photoionization, Shock Heating
Scientific paper
The possibility of estimating the temperature and density in the O/+2/ zone of the narrow-line region in a variety of quasars and active galaxies is explored with regard to discriminating between photoionization and alternative energy sources (such as shock heating). The relative intensities of O III forbidden lines at 5007 + 4959 A, 4363 A, and of Ne III forbidden lines at 3869 + 3698 A are primarily used. Temperatures greater than or equal to 20,000 K in broad-line objects, and approximately 10,000 K in narrow-line objects are found consistent with the available data. Because of other possible interpretations based on a higher electron density for broad-line objects, however, it is suggested that measurements of the relative intensities of the Ar IV forbidden lines at 4711, 4740, 7237, and 7263 A are appropriate.
Balick Bruce
Heckman Timothy M.
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