BL Lac: A New Ultrahigh-Energy Gamma-Ray Source
Abstract
The active galactic nucleus BL Lac was observed with the GT-48 atmospheric Cherenkov detector of the Crimean Astrophysical Observatory from July 23 September 1, 1998, in order to search for ultrahighenergy gamma-ray (>1 TeV) emission. The object was in the field of view of the detector for more than 24 hours. The source was detected with a high level of confidence (7.2 σ) with a flux equal to (2.1±0.4)×10-11 photons cm-2 s-1.
- Publication:
-
Astronomy Reports
- Pub Date:
- April 2001
- DOI:
- 10.1134/1.1361316
- arXiv:
- arXiv:astro-ph/0111448
- Bibcode:
- 2001ARep...45..249N
- Keywords:
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- Astrophysics
- E-Print:
- 7 pages, 4 figures