Other
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..121z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 121-124.
Other
20
Active Galactic Nuclei, Emission Spectra, Metallicity, Spectral Line Width, Accretion Disks, Anisotropy, Iron, Quasars, Seyfert Galaxies
Scientific paper
The relative strength of the Fe II 4570-A line in 138 AGN in relation to the line width of B-beta is examined. For objects with FWHM (H-beta) greater than 6000 km/s, the mean Fe II 4570/H-beta intensity ratio is 0.21, less than half of that in the other objects. All five objects with exceptionally broad and flat profiles, such as Arp 102B, have weak or absent Fe II emission. It is verified that this effect is not an artifact of blending of the Fe II multiplets or of an underestimation of the H-beta line width due to blending with Fe II features. The anticorrelation between the Fe II 4570-A line strength and line width is interpreted as an effect of source orientation. The Fe II region is either highly anisotropic or is not coextensive with the conventional broad-line region such as the assumed disk-shaped low-ionization zone. This is consistent with the Fe II region being associated with a small-scale jet and embedded in a thick torus, and hence being visible only in nearly face-on positions.
Keel William C.
Zheng Wei
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