Journal
ASTROPHYSICAL JOURNAL
Volume 789, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/789/2/128
Keywords
gamma-ray burst: general; ISM: jets and outflows; relativistic processes; shock waves
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Funding
- Israel Science Foundation [1277/13]
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We compute the time- integrated, thermal emission produced by a series of radiation- mediated shocks that emerge from the photosphere of a gamma- ray burst outflow. We show that for a sufficiently broad distribution of shock strengths, the overall shape of the time- integrated spectral energy distribution below the peak is a power law, nu E-nu proportional to nu(alpha), with a slope of 1 < alpha < 2. A substructure in the spectral energy distribution (SED) can also be produced in this model for certain choices of the shock train distribution. In particular, we demonstrate that our model can reproduce the double- peak SED observed in some bursts, in events where a strong shock is followed by a sequence of sufficiently weaker ones.
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