Peak energy and efficiency of Gamma Ray Bursts

Details Peak energy and efficiency of Gamma Ray Bursts Peak energy and efficiency of Gamma Ray Bursts

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4401g&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #44.01; Bulletin of the American Astronomical Society, Vol. 32, p.1651

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of the Internal Shock Model of GRBs, where gamma-rays are produced by internal shocks within a relativistic wind. We show that observed GRB characteristics impose stringent constraints on wind and source parameters. We find that, contrary to common claims and in agreement with observations, a significant fraction, of order 20 the wind kinetic energy can be converted to radiation, provided the distribution of Lorentz factors within the wind has a large variance and provided the minimum Lorentz factor is >100. For a high efficiency wind, a radiation spectral energy break in the 0.1--1 MeV range is obtained due to pair-production optical depth for source sizes R/c<1 ms, suggesting a possible explanation for the observed clustering of spectral break energies in the 0.1--1 MeV range.

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