Stuttgart 2012 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 16: Astrophysik I

EP 16.1: Vortrag

Donnerstag, 15. März 2012, 10:30–10:45, V55.21

A spatially resolved shock-in-jet model of blazars — •Stephan Richter and Felix Spanier — ITPA, Universität Würzburg, Germany

So called Synchrotron Self Compton (SSC) models have been quite successful in explaining the emissions of blazars. However, observational results of the last years, most importantly intra day variability and certain time lags between different bands, have led to the conclusion that the usual approach of modelling blobs in blazar jets as homogeneous regions employing SSC codes is not sufficient.

Here a linearly, spatially resolved, self-consistent SSC model with particle acceleration due to Fermi-I and -II processes is presented. The electron spectra are evolving from a low energetic delta distribution by means of these processes. In contrast to homogeneous models the Fermi-I process is modelled as actual scattering around shock fronts, while keeping causality when convecting particles through space, thus multiple-shock scenarios can be computed. The effects of adiabatic losses on the particles and hence on the spectral energy distribution (SED) can be investigated. The SED is calculated in each spatial slice using the full IC cross section employing highly parallelised graphic processing units. Hence the presented model is able to explain observed SEDs of leptonic sources as well as to verify high variability results from acausal simulations. High variability can be achieved not only via injection of particles but also due to the presence of multiple shocks. This is shown for data from the recent multi-frequency campaign on Mrk 501.