High energy 7-rays combine three characteristics that make these energetic photons ideal carriers of information about nonthermal relativistic processes in astrophysical settings: (i) copious production in many galactic and extragalactic objects due to effective acceleration of charged particles and their subsequent interactions with the ambient gas, low frequency radiation, and magnetic fields; (ii) free propagation […]
At energies above 30 MeV, detection of cosmic Y-rays becomes significantly easier. The detection principle is based on conversion of the primary photon to an electron-positron pair, and on subsequent measurements of the tracks of secondary electrons with tracking detectors and their energy with a total-absorption calorimeter. This technique, originally developed for particle accelerator experiments, […]