Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..494s&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc
Astronomy and Astrophysics
Astronomy
Quasars, Astronomical And Space-Research Instrumentation, Galactic Nuclei, Circumnuclear Matter, And Bulges, Gamma-Ray
Scientific paper
The High Energy Stereoscopic System (H.E.S.S) has measured the fluxes and characterized the spectral variability of several blazars on timescales ranging from months down to minutes. In most of those objects, the light curves show little variability, which only gives information about their quiescent state and their duty cycles. A few blazars provide us with an unprecedented rich dataset. In particular, the exceptional flaring periods of PKS 2155-304 in June 28-31 2006 allow us, for the first time in the very-high-energy domain, to investigate whether the observed light curve can be considered as the realization of a random stationary Gaussian process. Due to large variations in the gamma-ray fluxes, the excess rms-flux correlation could be investigated, showing that the logarithm of the flux is the relevant Gaussian variable and that the power density spectrum is typical of a red noise.
Degrange Bernard
Superina Giulia
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