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Very High Energy Gamma Rays from PKS 2155−304

P. M. ChadwickDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKK. LyonsDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKT. J. L. McCombDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKK. J. OrfordDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKJ. L. OsborneDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKS. M. RaynerDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKS. E. ShawDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKK. E. TurverDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UKG. J. WieczorekDepartment of Physics, Rochester Building, Science Laboratories, University of Durham, Durham, DH1 3LE, England, UK

1999en

ABI

Annotatsiya

The close X-ray selected BL Lac PKS 2155-304 has been observed using the University of Durham Mark 6 very high energy (VHE) gamma ray telescope during 1996 September/October/November and 1997 October/November. VHE gamma rays with energy > 300 GeV were detected from this object with a time-averaged integral flux of (4.2 +/- 0.7 (stat) +/- 2.0 (sys)) x 10^(-11) per cm2 per s. There is evidence for VHE gamma ray emission during our observations in 1996 September and 1997 October/November, with the strongest emission being detected in 1997 November, when the object was producing the largest flux ever recorded in high-energy X-rays and was detected in > 100 MeV gamma-rays. The VHE and X-ray fluxes show evidence of a correlation.

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DOI: 10.1086/306862

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