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The high energy X-ray probe (HEX-P): probing the physics of the X-ray corona in active galactic nuclei

Nardini, Emanuele; Ricci, Claudio; Walton, Dominic J. +27 more

The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission, commonly described by a power law with a high-energy cutoff, is suggestive of Comptonization by thermal electrons. While several hypotheses have been proposed to expla…