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Poster communications
Long term variability of the blazar PKS 2155-304
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.
Cited literature [11 references]
http://hal.in2p3.fr/in2p3-01186534
Contributor : Claudine Bombar <>
Submitted on : Tuesday, August 25, 2015 - 11:08:51 AM
Last modification on : Wednesday, July 22, 2020 - 9:54:22 AM
Document(s) archivé(s) le : Thursday, November 26, 2015 - 1:55:49 PM
Contributor : Claudine Bombar <>
Submitted on : Tuesday, August 25, 2015 - 11:08:51 AM
Last modification on : Wednesday, July 22, 2020 - 9:54:22 AM
Document(s) archivé(s) le : Thursday, November 26, 2015 - 1:55:49 PM
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proc_chevalier_pks2155.pdf
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