Relativistic Jets from Collapsars
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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