Relativistic Jets from Collapsars
Miguel A. Aloy, Ewald Mueller, Jose M. Ibanez, Jose M. Marti, Andrew MacFadyen
Abstract
We have studied the relativistic beamed outflow proposed to occur in the collapsar model of gamma-ray bursts. A jet forms as a consequence of an assumed energy deposition of 1050- 1051 erg/s within a 30 cone around the rotation axis of the progenitor star. The generated jet flow is strongly beamed ( few degrees) and reaches the surface of the stellar progenitor (r ≈ 3 1010 cm) intact. At break-out the maximum Lorentz factor of the jet flow is about 33. Simulations have been performed with the GENESIS multi-dimensional relativistic hydrodynamic code.
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