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The nature of the coronae of accreting black holes

A.M. Lohfink

in 11th INTEGRAL Conference Gamma-Ray Astrophysics in Multi-Wavelength Perspective

Contribution: pdf


Accreting black holes are powerful sources of radiation. The conversion of gravitational energy into radiation is thought to take place in an accretion disk-corona system just outside the black hole. In this system, thermal accretion disk photons are upscattered in a corona of hot electrons situated above the accretion disk, producing X-rays. The nature of this Comptonizing corona remains a key open question in astrophysics. I will discuss recent INTEGRAL and NuSTAR results on galactic black hole binary and AGN coronae.