Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 2, Pages 236-239Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.236
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Analytic solutions are presented for the hydrodynamic collimation of a relativistic fireball by a surrounding baryonic wind emanating from a torus. The opening angle is shown to be the ratio of the power output of the inner fireball to that of the exterior baryonic wind. The gamma ray burst 990123 might thus be interpreted as a baryon poor jet (BPJ) with an energy output of order 10(50) erg or less, collimated by a baryonic wind from a torus with an energy output of order 10(52 5) eg, roughly the geometric mean of the BPJ and its isotropic equivalent.
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