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Title:
Swift follow-up of the gigantic TeV outburst of PKS 2155 - 304 in 2006
Authors:
Foschini, L.; Ghisellini, G.; Tavecchio, F.; Treves, A.; Maraschi, L.; Gliozzi, M.; Raiteri, C. M.; Villata, M.; Pian, E.; Tagliaferri, G.; Tosti, G.; Sambruna, R. M.; Malaguti, G.; di Cocco, G.; Giommi, P.
Affiliation:
AA(), AB(), AC(), AD(), AE(), AF(), AG(), AH(), AI(), AJ(), AK(), AL(), AM(), AN(), AO()
Publication:
THE FIRST GLAST SYMPOSIUM. AIP Conference Proceedings, Volume 921, pp. 329-330 (2007). (AIPC Homepage)
Publication Date:
07/2007
Origin:
AIP
Keywords:
X-ray sources (astronomical), BL Lac-type objects
Abstract Copyright:
(c) 2007: American Institute of Physics
DOI:
10.1063/1.2757336
Bibliographic Code:
2007AIPC..921..329F

Abstract

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.
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