The Energy of Long-Duration Gamma-Ray Bursts
2001; IOP Publishing; Volume: 560; Issue: 2 Linguagem: Inglês
10.1086/324409
ISSN1538-4357
AutoresTsvi Piran, P. Kumar, A. Panaitescu, L. Piro,
Tópico(s)Astro and Planetary Science
ResumoThe energy release in gamma-ray bursts (GRBs) is one of the most useful clues to the nature of their "inner engines." We show that within the framework of the relativistic external shock afterglow model, the narrowness of the observed X-ray flux of GRB afterglows implies that the energy of the GRB jets, after the early-afterglow phase, spans less than 1 order of magnitude. This result is not affected by uncertainties in the electron energy, magnetic field strength, or external medium density. We argue that the afterglow kinetic energy is within a factor of 2 of the initial energy in the relativistic ejecta; therefore, the energy output of the central engine of a long-duration GRB has a universal value.
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