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High Energy spectra of Seyferts and Unification schemes
Matthew Middleton, Chris Done, Nick Schurch
The Unified Model of AGN predicts the sole difference between Seyfert 1 and Seyfert 2 nuclei is the viewing angle with respect to an obscuring structure around the nucleus. High en…
Suzaku wide-band X-ray Spectroscopy of the Seyfert 2 AGN in NGC 4945
Takeshi Itoh, Chris Done, Kazuo Makishima +13
Suzaku observed a nearby Seyfert 2 galaxy NGC4945, which hosts one of the brightest active galactic nuclei above 20 keV. Combining data from the X-ray CCD camera (XIS) and the Hard…
Modelling the behaviour of accretion flows in X-ray binaries
Chris Done, Marek Gierlinski, Aya Kubota
(abridged) We review how the recent increase in X-ray and radio data from black hole and neutron star binaries can be merged together with theoretical advances to give a coherent p…
An absorption origin for the soft excess in Seyfert 1 AGN
M. J. Middleton, C. Done, M. Gierlinski
(abridged) The soft excess seen in the X-ray spectra of many high mass accretion rate AGN can be well modelled by reflection from a partially ionised accretion disc. However, the d…
The origin of the soft excess in high L/L_Edd AGN
Chris Done
We discuss 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 material rather than w…
Can the soft excess in AGN originate from disc reflection?
Chris Done, Sergei Nayakshin
The soft excess seen in many AGN is most probably due to partially ionized material moving at relativistic speeds close to the black hole. There are currently two potential geometr…