Hydrodymanic collimation of GRB fireballs

Details Hydrodymanic collimation of GRB fireballs Hydrodymanic collimation of GRB fireballs

2000-01-24

arxiv.org/abs/astro-ph/0001405v1

Astronomy and Astrophysics

Astrophysics

8 pages, uses REVTEX, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.236

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-pure jet 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 $10^{52}$ erg.

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