Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-31
Astronomy and Astrophysics
Astrophysics
27 pages, 5 figures, submitted to ApJ
Scientific paper
10.1086/306789
We investigate the dynamics and radiation from a relativistic blast-wave which decelerates as it sweeps up ambient matter. The bulk kinetic energy of the blast-wave shell is converted into internal energy by the process of accreting external matter. If it takes the form of non-thermal electrons and magnetic fields, then this internal energy will be emitted as synchrotron and synchrotron self-Compton radiation. We perform analytic and numerical calculations for the deceleration and radiative processes and present time-resolved spectra throughout the evolution of the blast-wave. We also examine the dependence of the burst spectra and light curves on various parameters describing the magnetic field and non-thermal electron distributions. We find that for bursts such as GRB~910503, GRB~910601 and GRB~910814, the spectral shapes of the prompt gamma-ray emission at the peaks in $\nu F_\nu$ strongly constrain the magnetic fields in these bursts to be well below ($\la 10^{-2}$) the equipartition values. These calculations are also considered in the context of the afterglow emission from the recently detected gamma-ray burst counterparts.
Chiang James
Dermer Carles D.
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