PKS 2155-304 in July 2006: H.E.S.S. results and simultaneous multi-wavelength observations

Journal Article · Wed Dec 24 04:00:00 EST 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3076696· OSTI ID:21255161

Lenain, Jean-Philippe; Boisson, Catherine; Sol, Helne; Zech, Andreas ^[1]; Benbow, Wystan; Buehler, Rolf ^[2]; Costamante, Luigi; Raue, Martin ^[2]; Giebels, Berrie; Superina, Giulia ^[3]; Katarzynski, Krzysztof; Pita, Santiago ^[4]; Punch, Michael ^[5]; Volpe, Francesca ^[3]

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1. LUTH, Observatoire de Paris, CNRS, Universite Paris Diderot, Meudon (France)
2. Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany)
3. Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, Palaiseau (France)
4. Torun Centre for Astronomy, Nicolaus Copernicus University, Torun (Poland)
5. APC, CNRS, Universite Paris 7 Denis Diderot, Paris (France)

The high-frequency-peaked BL Lac PKS 2155-304 is one of the brightest and best-studied VHE {gamma}-ray sources in the southern hemisphere. The High Energy Stereoscopic System (H.E.S.S.) has monitored PKS 2155-304 in 2006 and a multi-wavelength campaign involving X-ray, optical and radio observatories was triggered by the detection of an active state in July 2006, followed by the detection of two extraordinary flares on July, 28th and 30th, with peak fluxes {approx}100 times the usual values. We present results from the spectral and flux variability analysis of the VHE and simultaneous X-ray observations with Chandra during the second flare, as well as the detailed evolution of the VHE flux of PKS 2155-304 observed by H.E.S.S. in 2006. A study of flux correlations in the different frequency ranges during the second flare and the adjacent nights is discussed. We also present an interpretation of the active state of PKS 2155-304 in the framework of synchrotron self-Compton emission.

• OSTI ID: 21255161
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1085; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
99 GENERAL AND MISCELLANEOUS
COSMIC GAMMA SOURCES
RADIATION MONITORING
SOUTHERN HEMISPHERE
SYNCHROCYCLOTRONS
SYNCHROTRONS
WAVELENGTHS
X RADIATION