Constraints on the torus from X-ray AGN population studies

• Data: ~2000 2-10keV detected AGN, >100 CT, mostly z=0.3-4 CDFS, AEGIS-XD, C-COSMOS, XMM-XXL (20deg²)
• Full Bayesian spectral analysis Buchner+14
• Non-parametric luminosity function & NH distribution Buchner+15

Johannes Buchner (MPE/PUC) A. Georgakakis, K. Nandra, M. Brightman, M-L Menzel, Z. Liu, L-T. Hsu, M. Salvato, C. Rangel, J. Aird, A. Merloni and N. Ross

• Buchner et al. (2015)

Fraction of Obscured

Averaged over cosmic time, LX>1042 erg/s

AGN: 38+8-7%

Fraction of Compton-thick

AGN: 77+4-5%