Coronal properties in Active Galactic Nuclei
Andrea Comastri (INAF - OAS Bologna)
Tuesday 14/09/2021 @ 14:00, Sala IV piano Battiferro
The temperature of the Comptonizing hot plasma, that makes the corona in AGN, is manifested through a high-energy cutoff that has been difficult to constrain because it requires good quality data extending up to several tens of keV and possibly beyond. With the advent of the imaging X-ray spectroscopy in the hard X-ray band — thanks to the NASA NuSTAR mission — such measurements were possible for a few hundreds of nearby AGN. I will review recent NuSTAR results for a large sample of obscured AGN and discuss the implication for the physical mechanisms responsible for the observed cut-off distribution.