General purpose model comparison method for X-ray and γ-ray spectra

http://arxiv.org/abs/1402.0004

• General purpose model comparison method for X-ray and γ-ray spectra
• Computes and compare evidence for models by integrating their parameter space
• → Global search of parameter space
• Software available for Xspec and Sherpa

• CDFS ~300 AGN analysed
• 10 physically motivated models – What is the best spectral model for z>0.5 AGN?

• Necessary Components:
• Intrinsic powerlaw
• Cold reflection – accretion disk or denser regions
• Extended obscurer: torus, not disk/blob, not sphere
• Soft scattering unobscured powerlaw – Thomson scattering off ionized clouds