The Iron K Line Profile of IRAS 18325-5926

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 K-alpha 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 standalone broad components to the Fe K band. Here, we have analyzed 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.

Accepted by MNRAS; 13 pages; 10 figures; 2 tables

References in corpus (5)

• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
• INTEGRAL observations of the cosmic X-ray background in the 5-100 keV range via occultation by the Earth
• A BLR origin for the iron K$\alpha$ line in NGC7213
• Variable iron-line emission near the black hole of Markarian 766

Cited by in corpus (6)

• The subarcsecond mid-infrared view of local active galactic nuclei: II. The mid-infrared--X-ray correlation
• Suzaku Observations of Moderately Obscured (Compton-thin) Active Galactic Nuclei Selected by Swift/BAT Hard X-ray Survey
• No Signatures of Black-Hole Spin in the X-ray Spectrum of the Seyfert 1 Galaxy Fairall 9
• Suzaku observation of IRAS 00521-7054, a peculiar type-II AGN with a very broad feature at 6 keV
• X-ray time delays from the Seyfert 2 galaxy IRAS 18325-5926
• Highly ionized disc and transient outflows in the Seyfert galaxy IRAS 18325-5926