Search for point sources and diffuse emission from the Galactic plane with the HEGRA-IACT-system

Abstract

The HEGRA-IACT-system with a FoV of ~1.5 deg radius has been used for surveying one quater of the Galactic disc in respect to point sources, moderately extended sources and for diffuse emission in the energy range above 1 TeV. In total 140 h of good observation time were accumulated. No new source has been discoverd. Limits on the level of 20% or lower of the Crab flux on about 87 potential sources like SNR, Pulsars and EGRET sources are derived. A limit on the diffuse emission is given on the level of dPhi/dE(E=1 TeV) = 6.1 10^-15 ph cm-2 s-1 sr-1 Mev-1 resulting in a lower limit of 2.5 on the spectral index for the extrapolation of the meassured EGRET flux for the diffuse emission.