Titlebook: High Energy Astrophysics; An Introduction Thierry J.-L. Courvoisier Book 2013 Springer-Verlag Berlin Heidelberg 2013 AGN.Accretion disks.As

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Compton Processes interactions. This is one of the most important processes in high-energy astrophysics, as it allows to transfer an important fraction of the electron energy to the photons and thus to radiate this energy away from the source.

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Comptonisationeract with an electron gas. Imagine for example some source of photons at the centre of a hot medium. We want to understand the observed photon spectrum, i.e. the photon energy distribution that emerges from the hot medium.

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Radiation Inefficient Accretion Flowsere transferred to the electrons rather than to the ions, it would be radiated efficiently, since electrons radiate much more efficiently than ions. In the accreting plasma, the temperature of the ions is thus much higher than that of the electrons (by some two orders of magnitude).

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X-Ray Binariest in these two wavebands. This is illustrated by Fig. 16.1 which shows the bulge of our Galaxy observed in the hard X-rays by INTEGRAL (top), and in the visible domain (bottom). This illustrates how essential multi-wavelength observations are. One simply cannot discover or understand objects that em

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