The Origin of the soft excess in AGN

Details The Origin of the soft excess in AGN The Origin of the soft excess in AGN

2007-03-16

arxiv.org/abs/astro-ph/0703449v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, for the conference "The Central Engines of AGN," Xi'an, China, October 2006. ASP Conference Series, in pres

Scientific paper

We discuss various ideas for the origin of the soft X-ray excess seen in AGN. There are clear advantages to models where this arises from atomic processes in partially ionised rather than where it is a true continuum component. However, current data cannot distinguish between models where this material is seen in reflection or absorption. While higher energy data may break the degeneracies, we also suggest that strong outflows are extremely likely to be present, lending more physical plausibility to an absorption origin. This more messy picture of NLS1's means that they are probably not good places to test GR, but they do give insight into the spectra expected from the first QSO's in the early Universe.

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