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Title: The iron K line profile of IRAS 18325–5926
Authors: Vaughan, S. A.
Lobban, A. P.
First Published: 13-Feb-2014
Publisher: Oxford University Press (OUP)
Citation: Monthly Notices of the Royal Astronomical Society, 2014, 439 (2), pp. 1575-1587
Abstract: IRAS 18325−5926 is an X-ray bright, Compton-thin, type 2 Seyfert galaxy and it was the first Seyfert 2 in which the presence of a broad Fe Kα emission line was claimed. However, although the structure of the Fe line appears broad, there is tentative evidence that it may comprise multiple lines. Nevertheless, previous analyses have only consisted of fitting stand-alone broad components to the Fe K band. Here, we have analysed all available X-ray CCD data from Suzaku, XMM–Newton and ASCA to fully investigate the nature of the emission complex by testing broad-band physical models and alternative hypotheses. We find that both a model consisting of broad, blurred reflection from an ionized accretion disc and a model consisting of cold, neutral reflection plus narrow emission lines from highly ionized photoionized gas (log ξ ∼ 3.5) offer statistically comparable fits to the data although the true reality of the Fe line cannot currently be determined with existing data. However, it is hoped that better quality data and improved photon statistics in the Fe K band will allow a more robust distinction between models to be made.
DOI Link: 10.1093/mnras/stu002
ISSN: 1365-2966
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014The Author. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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