Ultra-high-energy gamma rays were detected in a number of experiments from pulsars (Crab and Vela), X-ray binaries (Cyg X-3, Her X-1, Vela X-1) and extragalactic sources (Cen A, M31). Most of these objects emit TeV energy gamma rays at intensity levels of 10-11±1γ cm-2s-1. This review paper presents a summary of currently available observational results.
Cosmic Pathways: Contemporary Perpectives in Physics and Astrophysics
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