Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-30
AIPConf.Proc.921:329-330,2007
Astronomy and Astrophysics
Astrophysics
2 pages, 1 figure, 1 Table. Proceedings of the First GLAST Symposium, to be published
Scientific paper
10.1063/1.2757336
At the end of July 2006, the blazar PKS 2155-304 (z=0.116) underwent a strong outburst observed at TeV energies by HESS (up to 17 Crab flux level at E > 200 GeV). The Swift satellite followed the evolution of the source for about one month. The data analysis - reported in another paper - has shown that, despite the violent activity at TeV energies, the synchrotron energy distribution increased in normalization, but only with a small shift in frequency. In the present work, we fit the broad-band spectrum with a log-parabolic model, to search for indications of intrinsic curvature, which in turn is usually interpreted as a signature of energy-dependent acceleration mechanisms of electrons.
Cocco G. Di
Foschini Luca
Ghisellini Gabriele
Giommi Paolo
Gliozzi Mario
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