Origin of the X-ray disc-reflection steep radial emissivity
Origin of the X-ray disc-reflection steep radial emissivity
X-ray reflection off the accretion disc surrounding a black hole, together with the associated broad iron K$\alpha$ line, has been widely used to constrain the innermost accretion-flow geometry and black hole spin. Some recent measurements have revealed steep reflection emissivity profiles in a number of active galactic nuclei and X-ray …