A qualitative study of cosmic fireballs and gamma-ray bursts

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bursts, Cosmic Rays, Fireballs, Gamma Rays, Electron-Positron Pairs, Luminosity, Pair Production

Scientific paper

If a large amount of energy is suddenly converted into a concentrated burst of (MeV) gamma rays, the prolific creation of electron-positron pairs will inhibit the escape of photons until they have been degraded below the pair-production threshold. This sets general constraints on the possible luminosities of rapidly varying gamma-ray sources and suggests why the observed gamma-ray bursts have an approximately standardized and 'soft' spectrum.

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