Spectrum of cosmic fireballs

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Bursts, Gamma Ray Astronomy, Nuclear Explosions, Radiant Flux Density, Spectrum Analysis, Annihilation Reactions, Computer Programs, Electron Scattering, Leptons, Light (Visible Radiation), Pair Production, Proton Scattering

Scientific paper

A progress report on cosmic fireballs is presented. The main new results are: (1) the phenomenon should be almost universal, and most explosive gamma-ray sources should show the characteristic fireball spectrum; (2) even if the radiation density is insufficient, pair production in electron-proton or electron-electron scattering might start the fireball; and (3) some computed fireball spectra are shown. They all have in common a 1/E low-energy behavior, a 100 keV flattening, and a 0.5 MeV cut-off.

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