Detection of gamma rays above 1 TeV from the Crab Nebula by the second HEGRA imaging atmospheric Cherenkov telescope at La Palma

Details Detection of gamma rays above 1 TeV from the Crab Nebula by the second HEGRA imaging atmospheric Cherenkov telescope at La Palma Detection of gamma rays above 1 TeV from the Crab Nebula by the second HEGRA imaging atmospheric Cherenkov telescope at La Palma

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aph.....4..199h&link_type=abstract

ASTROPARTICLE PHYSICS, Volume 4, Issue 3, p. 199-215.

Physics

36

Scientific paper

The results of observations of the Crab Nebula by the second HEGRA imaging atmospheric Cherenkov telescope during the period 1994/1995 are presented. The signal, detected at a level of 10 sigma, allows one to estimate the flux and the spectral index of the gamma-ray energy spectrum above 1 TeV. The analysis, based on the comparison of measurements with comprehensive Monte Carlo simulations, reveals a gamma-ray flux F_gamma(>=1 TeV) ~=8 x10^-12 photons cm^-2 s^-1, and indicates a rather steep integral spectrum in the energy region 1-3 TeV with a power-law index alpha~=1.6-1.8.

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