An Explanation for the soft X-ray excess in AGN

Details An Explanation for the soft X-ray excess in AGN An Explanation for the soft X-ray excess in AGN

2005-11-15

arxiv.org/abs/astro-ph/0511457v1

Mon.Not.Roy.Astron.Soc.365:1067-1081,2006

Astronomy and Astrophysics

Astrophysics

16 pages, MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2005.09844.x

We present a large sample of type 1 active galactic nuclei (AGN) spectra taken with XMM-Newton, and fit them with both the conventional model (a power law and black body) and the relativistically-blurred photoionized disc reflection model of Ross and Fabian (2005). We find the disc reflection model is a better fit. The disc reflection model successfully reproduces the continuum shape, including the soft excess, of all the sources. The model also reproduces many features that would conventionally be interpreted as absorption edges. We are able to use the model to infer the properties of the sources; specifically that the majority of black holes in the sample are strongly rotating and that there is a deficit in sources with an inclination > 70 degrees. We conclude that the disc reflection model is an important tool in the study of AGN X-ray spectra.

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