Search for TeV Gamma-emissions from BL Lacertae with the HEGRA equatorial mount Cherenkov telescope

BL Lacertae is a nearby active galaxy of the blazar class with a redshift z=0.069 and therefore, within the unified model of AGN, a candidate for the observation of gamma emissions in the TeV range. During 1998, BL Lacertae has been observed by the HEGRA equatorial mount Cherenkov telescope. The reconstructed showed images have been subjected to Gamma-Hadron separation. The sample has been used to derive an upper limit of the energy flux from BL Lacertae carried by Gamma-Rays with energies greater than 1 TeV.