Upper limits on BL Lacs
Abstract
The HEGRA IACT stereoscopic system, with an energy threshold of about 500 GeV, was used to search for γ-ray emission of several AGN, most of them are low redshift BL Lacs (z 0.2). Here we show the results of observations that were made since June 1997 at zenith angles up to 40 . No evidence for TeV emission is detected, corresponding upper limits are given.
- Publication:
-
26th International Cosmic Ray Conference (ICRC26), Volume 3
- Pub Date:
- August 1999
- Bibcode:
- 1999ICRC....3..410B