Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 79: Gammaastronomie III

T 79.6: Talk

Thursday, March 22, 2018, 17:50–18:05, Philo-HS7

Pair cascades in active galactic nuclei — •Christoph Wendel and Karl Mannheim — Fakultät für Physik und Astronomie, Universität Würzburg, Germany

External radiation fields due to recombination radiation from photo-ionized gas clouds or thermal emission from accretion flows lead to energy losses of relativistic particles in active galactic nuclei. Near the central black hole, particle acceleration by impulsive injection from flares or magnetospheric vacuum gaps or photons from photo-pion decay can induce pair cascades driven by inverse-Compton energy losses of primary or secondary electrons and positrons. Here, we discuss the kinetic equations and their numerical solution describing the emerging radiation from such pair cascades in the context of recent high-energy observations.