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Title: An X-ray Baldwin effect for the narrow Fe Kα lines observed in active galactic nuclei
Authors: Page, Kim L.
O'Brien, Paul T.
Reeves, J. N.
Turner, Martin J. L.
First Published: 1-Jan-2004
Publisher: Oxford University Press (OUP) on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2004, 347 (1), pp. 316-322
Abstract: 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.
DOI Link: 10.1111/j.1365-2966.2004.07203.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2004 The Authors. Journal compilation © 2004 RAS. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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