Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-14
Astronomy and Astrophysics
Astrophysics
ApJ, submitted, 26 pages, 5 figures
Scientific paper
10.1086/339163
We analyze the stability of a relativistic double (forward/reverse) shock system which forms when the fireball of a Gamma-Ray Burst (GRB) impacts on the surrounding medium. We find this shock system to be stable to linear global perturbations for either a uniform or a wind (r^{-2}) density profile of the ambient medium. For the wind case, we calculate analytically the frequencies of the normal modes which could modulate the early short-term variability of GRB afterglows. We find that perturbations in the double shock system could induce oscillatory fluctuations in the observed flux on short (down to seconds) time scales during the early phase of an afterglow.
Loeb Abraham
Wang Xiaohu
Waxman Eli
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