The hard X-ray spectrum of the Seyfert galaxy IRAS 18325-5926: cool corona, reflection from an ionized disk and variable iron K emission

Abstract

We report our analysis of X-ray spectra of the Seyfert galaxy IRAS 18325-5926 (=Fairall 49) obtained from various X-ray observatories prior to XMM-Newton, including new results from two RXTE and one BeppoSAX observations. A relatively steep continuum slope (photon-index of ~2.2) in the 2-15 keV band is confirmed. The continuum spectrum observed with the BeppoSAX PDS shows a possible roll-over at energies above 30 keV, indicating a Comptonizing corona cooler than in other Seyfert nuclei. The X-ray spectrum above 2 keV is best explained with a model including reflection from a highly ionized disk with significant relativistic blurring. The iron K-alpha emission feature is then mainly due to FeXXV. The recent seven observations shows that the iron K emission flux appears to follow the continuum between the observations separated by a few months to years, although some exceptions suggest that the line strength may be determined in a more complex way.

11 pages, accepted for publication in MNRAS

References in corpus (9)

• The lack of variability of the iron line in MCG-6-30-15: general relativistic effects
• The iron line in MCG-6-30-15 from XMM-Newton: evidence for gravitational light-bending?
• Narrow Components within the Fe Kalpha Profile of NGC 3516: Evidence for the Importance of General Relativistic Effects?
• The variability of accretion onto Schwarzschild black holes from turbulent magnetized discs
• BeppoSAX average spectra of Seyfert galaxies
• Evolution of the X-ray spectrum in the flare model of Active Galactic Nuclei
• An XMM-Newton observation of Ton S180: Constraints on the continuum emission in ultrasoft Seyfert galaxies
• On the accretion geometry of Cyg X-1 in the low/hard state
• X-ray emission properties of galaxies in Abell 3128

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