An X-ray Baldwin effect for the narrow FeK lines observed in active galactic nuclei

The majority of active galactic nuclei (AGN) observed by XMM-Newton reveal narrow Fe Kalpha lines at similar to6.4 keV, due to emission from cold (neutral) material. There is an X-ray Baldwin effect in type I AGN, in that the equivalent width (EW) of the line decreases with increasing luminosity, with weighted linear regression giving EW proportional to L-0.17+/-0.08 (Spearman Rank probability of > 99.9 per cent). With current instrumental capabilities it is not possible to determine the precise origin for the narrow line, with both the broad-line region and putative molecular torus being possibilities. A possible explanation for the X-ray Baldwin effect is a decrease in the covering factor of the material forming the fluorescence line.