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

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journal contribution
posted on 24.10.2012, 09:16 by Kim L. Page, Paul T. O'Brien, J. N. Reeves, Martin J. L. Turner
The majority of active galactic nuclei (AGN) observed by XMM–Newton reveal narrow Fe Kα 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∝ L[superscript −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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Citation

Monthly Notices of the Royal Astronomical Society, 2004, 347 (1), pp. 316-322

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP) on behalf of the Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

2004

Available date

24/10/2012

Publisher version

http://mnras.oxfordjournals.org/content/347/1/316

Language

en

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