Beobachtung von TeV-Photonen aus der Richtung des Krebsnebels mit dem 5 m"2-Tscherenkovteleskop des HEGRA-Detektors

Structure and initial operation of the first and second Cerenkov telescope for observation of point sources with very high energetic gamma emissions in the frame of the HEGRA project are described. Using Monte-Carlo-Simulations, the most important detector properties have been calculated including the energy threshold and the effective detection area for gamma-induced air showers. By the developed air shower image processing method the hadronically induced air showers are suppressed, and sensitivities for point sources are improved. Within 75 h of observation of TeV-photons from the Crab nebula a surplus of 544 events has been measured and identified as photon-induced air showers. The surplus is in line with the assumption of a point source. The calculated integral VHE gamma radiation flow, F(E#>=#2.4 TeV)=(0.8#+-#0.21#+-#0.16).10"-"1"1/cm"2 s, can be attributed to the generation by inverse Compton scattering of high-relativistic electrons on low-energetic photons in the Crab nebula. No TeV-photons have been found analyzing observation results on the BL-Lacertae object Markarian 421. (WEN)SIGLEAvailable from TIB Hannover: RR 2916(96-3) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman