VHE Gamma Rays from PKS 2155-304

Details VHE Gamma Rays from PKS 2155-304 VHE Gamma Rays from PKS 2155-304

1998-10-14

arxiv.org/abs/astro-ph/9810209v1

Astronomy and Astrophysics

Astrophysics

14 pages, 6 figures, accepted for publication in Ap. J

Scientific paper

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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