Prof. Dr. Felix Spanier von der North-West University, Potchefstroom, Southafrica, ist zu Gast bei Prof. Dr. Reinhard Schlickeiser (TP IV) und hält im Rahmen des Seminars "Weltraum- und Astrophysik" am 09.12.2014 um 14:15 Uhr in NB 7/67 einen Vortrag über “Emission mechanisms in AGN - a non-linear puzzle”. Interessierte sind herzlich willkommen!

Abstract: Active Galactiv Nuclei are nowadays one of the most interesting objects of extragalactic astronomy. Their wideband spectrum and their extreme properties - in terms of energy as well as in terms of variability - can be studied with recent experiments like HESS and Fermi. Although the amount of observational data is increasing rapidly, we do not yet understand the intrinsic mechanics of these objects. While there is consensus that AGN host populations of nonthermal particles, it is neither clear whether these are only leptons or also protons nor is it clear, which emission mechanism plays a role.
In my talk I want to outline the problems in understanding the emission mechanisms. One of the major problems is the nonlinear coupling of different processes, which effectively prevents a simple linear analysis and a mapping of observational spectra and internal parameters. I will present different approaches of modeling AGN, their predictions and their pitfalls.

Prof. Dr. Felix Spanier