What is the origin of the soft excess in AGN?

Details What is the origin of the soft excess in AGN? What is the origin of the soft excess in AGN?

2004-12-20

arxiv.org/abs/astro-ph/0412513v1

Astronomy and Astrophysics

Astrophysics

The proceedings for XDAP 2004, to be published in AIP in May 2005

Scientific paper

10.1063/1.1960944

We investigate the nature of the soft excess below 1 keV observed in AGN. We use the XMM-Newton data of the low redshift, optically bright quasar, PG 1211+143, and we compare it with the Narrow Line Seyfert 1 galaxy, 1H 0707-495, which has one of the strongest soft excesses seen. We test various ideas for the origin of the soft X-ray excess, including a separate spectral component (for example a low temperature Comptonized component), a reflection-dominated model, or a complex absorption model. All three can give good fits to the data, and $\chi^2$ fitting criteria are not sufficient to discriminate among them. Instead, we favor the complex absorption model on the grounds that it is the most physically plausible.

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