Modelling rapid TeV variability of PKS 2155-304

摘要

We present theoretical modelling for the very rapid TeV variability of PKS2155--304 observed recently by the H.E.S.S. experiment. To explain thelight-curve, where at least five flaring events were well observed, we assumefive independent components of a jet that are characterized by slightlydifferent physical parameters. An additional, significantly larger component isused to explain the emission of the source at long time scales. This componentdominates the emission in the X-ray range, whereas the other components aredominant in the TeV range. The model used for our simulation describesprecisely the evolution of the particle energy spectrum inside each componentand takes into account light travel time effects. We show that a relativelysimple synchrotron self-Compton scenario may explain this very rapidvariability. Moreover, we find that absorption of the TeV emission inside thecomponents due to the pair creation process is negligible.