Evolution of an afterglow with a hard electron spectrum

Details Evolution of an afterglow with a hard electron spectrum Evolution of an afterglow with a hard electron spectrum

2003-01-19

arxiv.org/abs/astro-ph/0301379v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, contribution to Rome 2002 GRB Workshop

Scientific paper

Diffusive shock acceleration theory suggests that the ``universal'' energy spectrum of electrons with a power-law index p approximately equal to 2.3, commonly used to model GRB afterglows, cannot extend below an electron lorentz factor gamma_e equal to the bulk lorentz factor of the blast wave multiplied by the ratio of proton and electron masses. We suggest that the electron energy distribution has a slope p < 2 below this limit, down to an appropriate gamma_m. A two-slope spectrum such as this provides a good model for the afterglow of GRB010222.

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