Modelling the extreme X-ray spectrum of IRAS 13224−3809
Abstract
The extreme narrow-line Seyfert 1 galaxy IRAS 13224−3809 shows significant variability, frequency-dependent time lags, and strong Fe K line and Fe L features in the long 2011 XMM–Newton observation. In this work, we study the spectral properties of IRAS 13224−3809 in detail, and carry out a series of analyses to probe the nature of the source, focusing in particular on the spectral variability exhibited. The reflection grating spectrometer spectrum shows no obvious signatures of absorption by partially ionized material ('warm' absorbers). We fit the 0.3–10.0 keV spectra with a model that includes relativistic reflection from the inner accretion disc, a standard power-law active galactic nucleus continuum, and a low-temperature (∼0.1 keV) blackbody, which may originate in the accretion disc, either as direct or reprocessed thermal emission. We find that the reflection model explains the time-averaged spectrum well, and we also undertake flux-resolved and time-resolved spectral analyses, which provide evidence of gravitational light-bending effects. Additionally, the temperature and flux of the blackbody component are found to follow the L ∝ T^4 relation expected for simple thermal blackbody emission from a constant emitting area, indicating a physical origin for this component.
Additional Information
© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 October 6. Received 2014 October 6; in original form 2014 May 29. First published online November 13, 2014. This work was greatly expedited thanks to the help of Jeremy Sanders in optimizing the various convolution models. We thank our referee, Chris Done, for helpful comments.Attached Files
Published - MNRAS-2015-Chiang-759-69.pdf
Submitted - 1410.1488v1.pdf
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Additional details
- Eprint ID
- 55637
- Resolver ID
- CaltechAUTHORS:20150309-110052665
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2015-03-10Created from EPrint's datestamp field
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2021-11-10Created from EPrint's last_modified field