8th HEAD Meeting, 8-11 September, 2004
Session 18 Gamma-ray Bursts
Poster, Thursday, September 9, 2004, 9:00am-10:00pm

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[18.13] Relativistic Winds from Collapsar Jets

E.A. Gómez, P.E. Hardee (University of Alabama)

Recent simulations of collapsar jets indicate they are Kelvin-Helmholtz unstable as they propagate through the atmosphere of the collapsar progenitor. Pinch-body wave modes that grow in the flow are important at breakout for the subsequent jet evolution into a wind. From our stability analysis we predict that pinch-body modes should develop just upstream from the jet head at breakout. We then evolve the jet flow using the relativistic wind equation for a causally disconnected radial flow from the surface of a collapsar progenitor to the distance at which the flow becomes optically thin to gamma rays.

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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.