/Fe XI/ lambda 7892 emission in Seyfert galaxies

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Abstract
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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