Other
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..891g&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 94, Dec. 1982, p. 891-893.
Other
15
Active Galaxies, Balmer Series, Galactic Nuclei, Interstellar Extinction, Quasars, Spectral Energy Distribution, Spectral Line Width, Electron Density (Concentration), Forbidden Bands, Helium, Hydrogen, Radio Galaxies, Seyfert Galaxies
Scientific paper
The reliability of the narrow line Balmer decrement as an indicator of reddening is examined. Estimates of the reddening and electron density of the narrow line regions of a number of active galaxies are made by using the trans-auroral/nebular line ratios of forbidden line S II and O II. The derived densities agree with published estimates from the S II forbidden line 6717 A/6731 A ratios, and reddenings derived by this and other methods agree with those predicted from Balmer decrements. It is concluded that the intrinsic narrow-line Balmer decrement is close to the Menzel-Baker case B values, and that observations of the narrow line Balmer decrement do give a reliable indication of the reddening.
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