Specifically, I study the importance of radiative processes in general relativistic magneto-hydrodynamic (GRMHD) simulations on the dynamics of the accretion flow around Sgr A* and examine the effects a self-consistent treatment of radiative cooling in GRMHD simulations has on the simulated spectra. I also discuss the contribution of the protons to the high-energy emission from jets of accreting black holes and present a new semi-analytic spectral jet model. This spectral model is then applied to analyse quasi-simultaneous observations from radio to the soft gamma-rays of Cygnus X-1.
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