Other
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..501g&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, Apr. 15, 1978, p. 501-506.
Other
77
Forbidden Bands, Iron, Line Spectra, Red Shift, Seyfert Galaxies, Abundance, Atomic Excitations, Emission Spectra, Metal Ions, X Ray Spectra
Scientific paper
This paper reports the detection of forbidden Fe XI emission at 7892 A in the spectra of nine Seyfert galaxies. Measured line strengths relative to H-beta are presented for the nine galaxies, and line-strength upper limits are given for 13 additional Seyferts with no apparent forbidden Fe XI emission. It is found that the forbidden Fe XI line at 7892 A is slightly blueshifted with respect to other emission lines in seven of the galaxies and that the 7892-A line is significantly broader than other forbidden lines in two of the galaxies. Calculations are performed which demonstate that photoionization by the observed power-law continuum can account for the observed forbidden Fe XI emission at 7892 A in NGC 4151 and, presumably, in other Seyfert galaxies. It is shown that there is no apparent correlation either between X-ray luminosity and forbidden Fe XI line strength or between forbidden Fe XI emission and the spectral index of the optical continuum for the galaxies examined.
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