Gamma ray spectrum of the Crab nebula in the multi TeV region k20
Abstract
The THEMISTOCLE array of 18 Cherenkov detectors which has a 3 TeV gamma energy threshold, has detected a signal from the Crab nebula at a 5.8 standard deviation level. Information on the energy spectrum is obtained in the range 3-15 TeV. The integrated flux can be fitted with the form, Phi(>E)=(3.7+/-0.5)x10^-12 (E/5)^-1.5+/-0.20 cm^-2 s^-1 (E in TeV) compatible with the extrapolation of results at lower energies. The Crab signal is used to measure the angular resolution of the multi-telescope technique. The value obtained is 2.3 mr (0.15 deg) in agreement with the results of simulations, and confirms the interest of this new method for multi-TeV gamma-ray detection.
- Publication:
-
Astroparticle Physics
- Pub Date:
- December 1993
- DOI:
- 10.1016/0927-6505(93)90001-T
- Bibcode:
- 1993APh.....1..341T