Reflection geometries in absorbed and unabsorbed AGN
  The hard X-ray emission of active galactic nuclei (AGN), and in particular,
the reflection component, is shaped by the innermost and outer regions of the
galactic nucleus. Our main goal is to investigate the variation of the Compton
hump amongst a population of sources and correlate it with other spectral
properties to constrain the source geometry. We studied the NuSTAR hard X-ray
spectra of a sample of 83 AGN and performed a detailed spectral analysis of
each of them. Based on their spectral shape, we divided the sample into five
categories and also studied their stacked spectra. We found a stronger
reflection in mildly obscured sources, which verifies the results reported in
previous works. In addition, the reflection behaviour, and probably origin,
varies with absorption. The accretion disc seems to be the main reflector in
unabsorbed sources. A clumpy torus seems to produce most of the reflection in
obscured sources. The filling factor of the clouds surrounding the active
nucleus is a key parameter that drives the appearance of AGN. Finally, we found
that the Fe line and the Compton hump are roughly correlated, as expected.
