Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Explanation for the soft X-ray excess in AGN   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.

15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess