Freiburg 2008 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 5: Astrophysics - Poster Session

EP 5.2: Poster

Montag, 3. März 2008, 17:30–19:00, Vorraum KGI-Aula

Synchrotron self-Compton flaring of TeV blazars — •Christian Röken and Reinhard Schlickeiser — Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, Deutschland

The analysis of data on flaring TeV-blazars obtained for example by H.E.S.S., MAGIC or VERITAS requires accurate elaborated theoretical radiation models. We assumed a model where the flaring of the TeV-blazars is a result of the synchrotron self-Compton scattering process. At the time t = t₀ a flare of the emission knot occurs due to the instantaneous uniform injection of monoenergetic ultrarelativistic electrons over the knot volume. The emission knot itself moves with the relativistic bulk speed V with respect to an external observer. It is modeled as a spherical magnetized plasma cloud of radius R which consists of cold fully ionized electrons of uniform density N_e and a time-dependent magnetic field B(t) that adjusts itself to the actual kinetic energy density of the radiating electrons in these sources. This magnetic field is a relevant physical quantity for the SSC radiation and associated in this special case to a radiative nonlinear cooling of the ultrarelativistic electrons. It is most probably a result of the interaction of the relativistically moving knot with the surrounding ambient interstellar or intergalactic medium that also causes the injection of ultrarelativistic charged particles by the relativistic pick-up process. The nonlinear SSC model allows us to provide the necessary intrinsic radiation formulas for the Thomon cross section and more general the Klein-Nishina cross section.