Very-high-energy gamma ray (VHEGR) denotes gamma radiation with photon energies of 100 GeV (gigaelectronvolt) to 100 TeV (teraelectronvolt), i.e., 1011 to 1014 electronvolts.[1] This is approximately equal to wavelengths between 10−17 and 10−20 meters, or frequencies of 2 × 1025 to 2 × 1028 Hz. Such energy levels have been detected from emissions from astronomical sources such as some binary star systems containing a compact object.[1] For example, radiation emitted from Cygnus X-3 has been measured at ranges from GeV to exaelectronvolt-levels.[1] Other astronomical sources include BL Lacertae,[2] 3C 66A[3] Markarian 421 and Markarian 501.[4] Various other sources exist that are not associated with known bodies. For example, the H.E.S.S. catalog contained 64 sources in November 2011.[5]
https://en.wikipedia.org/wiki/Very-high-energy_gamma_ray
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