2008/07/28 by K. Katarzyński, K. Katarzynski, J-P. Lenain +4
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2008.13753.x
6 pages, 1 figure, Accepted for publication in MNRAS the Main Journal
arxiv created 2008/07/28 · openalex publication_date 2008/09/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present theoretical modelling for the very rapid TeV variability of PKS 2155−304 observed recently by the High Energy Spectroscopic System (HESS) experiment. To explain the light curve, where at least five flaring events were well observed, we assume five independent components of a jet that are characterized by slightly different physical parameters. An additional, significantly larger component is used to explain the emission of the source at long time-scales. This component dominates the emission in the X-ray range, whereas the other components are dominant in the TeV range. The model used for our simulation describes precisely the evolution of the particle energy spectrum inside each component and takes into account light travel time effects. We show that a relatively simple synchrotron self-Compton scenario may explain this very rapid variability. Moreover, we find that absorption of the TeV emission inside the components due to the pair creation process is negligible.