Astrophysics (Index)About

very-high-energy gamma rays

(energetic gamma rays with 100 GeV to 100 TeV photon energy)

The term very-high-energy gamma rays (VHEGR) is used for gamma rays in the 100 GeV to 100 TeV range of photon energy. Such high-energy photons are detected, typically using detectors aimed at this specific range by detecting the Cherenkov radiation associated with air showers (Cherenkov detectors): the VHEGR-photon interaction with Earth atmosphere produces particles with sufficient kinetic energy to produce lower-frequency Cherenkov radiation as they, in turn, pass through the atmosphere. One reason such gamma rays are of interest is the assumption that they travel very straight, increasing the chances of identifying the source.

The term VHE is also used more generally for this energy range. Photons beyond 100 TeV are termed ultra-high-energy gamma rays.

(EMR,spectrum,band,gamma rays)
Further reading:
12×10-21m24×1027Hz100TeVbeginvery-high-energy gamma rays
12×10-18m24YHz100GeVendvery-high-energy gamma rays

Referenced by pages:
ultra-high-energy gamma rays (UHEGR)