X-ray analysis of 94 FIR-selected AGNs at z=0.07-5 shows rising obscured fraction with redshift, soft excess in 10 sources, and a luminosity-dependent covering factor correlation supporting the receding torus model.
The Toroidal Obscuration of Active Galactic Nuclei
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abstract
Observations give strong support for the unification scheme of active galactic nuclei. The scheme is premised on toroidal obscuration of the central engine by dusty clouds that are individually very optically thick. These lectures summarize the torus properties, describe the handling and implications of its clumpy nature and present speculations about its dynamic origin.
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The Lockman-SpReSO Project: A Deep X-ray Spectral View of a FIR-selected AGN Population
X-ray analysis of 94 FIR-selected AGNs at z=0.07-5 shows rising obscured fraction with redshift, soft excess in 10 sources, and a luminosity-dependent covering factor correlation supporting the receding torus model.