A Spectacular VHE Gamma-Ray Outburst from PKS 2155-304 in 2006

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dc.creatorBenbow, W.
dc.creatorBoisson, C.
dc.creatorCostamante, L.
dc.creatorde Jager, O.
dc.creatorDubus, G.
dc.creatorEmmanoulopoulos, D.
dc.creatorGiebels, B.
dc.creatorPita, S.
dc.creatorPunch, M.
dc.creatorRaubenheimer, C.
dc.creatorRaue, M.
dc.creatorSol, H.
dc.creatorWagner, S.
dc.date2007-09-28
dc.date.accessioned2026-07-07T08:32:54Z
dc.date.available2026-07-07T08:32:54Z
dc.descriptionSince 2002 the VHE (>100 GeV) gamma-ray flux of the high-frequency peaked BL Lac PKS 2155-304 has been monitored with the High Energy Stereoscopic System (HESS). An extreme gamma-ray outburst was detected in the early hours of July 28, 2006 (MJD 53944). The average flux above 200 GeV observed during this outburst is ~7 times the flux observed from the Crab Nebula above the same threshold. Peak fluxes are measured with one-minute time scale resolution at more than twice this average value. Variability is seen up to ~600 s in the Fourier power spectrum, and well-resolved bursts varying on time scales of ~200 seconds are observed. There are no strong indications for spectral variability within the data. Assuming the emission region has a size comparable to the Schwarzschild radius of a ~10^9 solar mass black hole, Doppler factors greater than 100 are required to accommodate the observed variability time scales.
dc.description4 pages, 3 figures; To appear in the Proceedings of the 30th ICRC (Merida, Mexico)
dc.identifierhttps://arxiv.org/abs/0709.4608
dc.identifierhttp://arxiv.org/abs/0709.4608
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/138945
dc.subjectAstrophysics
dc.titleA Spectacular VHE Gamma-Ray Outburst from PKS 2155-304 in 2006
dc.typetext

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