NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:04:41 PDT
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For refcode 2004MNRAS.347..316P:
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NED Abstract

Copyright by Royal Astronomical Society. 2004MNRAS.347..316P An X-ray Baldwin effect for the narrow Fe K{alpha} lines observed in active galactic nuclei Page, K. L.; O'Brien, P. T.; Reeves, J. N.; Turner, M. J. L. Abstract. The majority of active galactic nuclei (AGN) observed by XMM-Newton reveal narrow Fe K{alpha} lines at ~6.4 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 is 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.
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