Very High Energy Gamma Rays from PKS 2155-304

Details Very High Energy Gamma Rays from PKS 2155-304 Very High Energy Gamma Rays from PKS 2155-304

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...513..161c&link_type=abstract

The Astrophysical Journal, Volume 513, Issue 1, pp. 161-167.

Astronomy and Astrophysics

Astronomy

139

Bl Lacertae Objects: Individual (Pks 2155-304), Galaxies: Active, Gamma Rays: Observations

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 more than 300 GeV were detected from this object with a time-averaged integral flux of (4.2+/-0.7_stat+/-2.0_sys)x10^-11 cm^-2 s^-1. 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 it was detected as a source of gamma rays of energy greater than 100 MeV. The VHE and X-ray fluxes show evidence of a correlation.

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