Long term variability of the blazar PKS 2155-304

Jérome Chevalier 1 M.A. Kastendieck F. Rieger G. Maurin 1 J.-P. Lenain 2 G. Lamanna 1
1 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Abstract : Time variability of the photon flux is a known feature of active galactic nuclei (AGN) and in particular of blazars. The high frequency peaked BL Lac (HBL) object PKS 2155-304 is one of the brightest sources in the TeV band and has been monitored regularly with different instruments and in particular with the H.E.S.S. experiment above 200 GeV for more than 11 years. These data together with the observations of other instruments and monitoring programs like SMARTS (optical), Swift-XRT/RXTE/XMM-Newton (X-ray) and Fermi-LAT (100 MeV < E < 300 GeV) are used to characterize the variability of this object in the quiescent state over a wide energy range. Variability studies are made by looking at the lognormality of the light curves and at the fractional root mean square (rms) variability F var in several energy bands. Lognormality is found in every energy range and the evolution of F var with the energy shows a similar increase both in X-rays and in TeV bands.
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Poster
34th International Cosmic Ray Conference (ICRC2015), Jul 2015, The Hague, Netherlands. PoS Proceedings of Science
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Jérome Chevalier, M.A. Kastendieck, F. Rieger, G. Maurin, J.-P. Lenain, et al.. Long term variability of the blazar PKS 2155-304. 34th International Cosmic Ray Conference (ICRC2015), Jul 2015, The Hague, Netherlands. PoS Proceedings of Science. 〈in2p3-01186534〉

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