Collapsar jets, cocoons and bursts

Details Collapsar jets, cocoons and bursts Collapsar jets, cocoons and bursts

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..399r&link_type=abstract

Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he

Astronomy and Astrophysics

Astronomy

Scientific paper

Core collapse of massive stars appears to be capable of producing highly relativistic beams of matter. As the beam makes its way out of the stellar envelope, most of its energy output during that period goes into a cocoon of relativistic plasma. This material would itself be able to escape along the direction of least resistance, and accelerate in approximately the same way as an impulsive fireball. Here we describe the evolution of such cocoon fireballs. We argue that an understanding of the structure and time-dependence of the cocoon plasma can come only through a knowledge of the properties of the stellar material through which it propagates. Shock waves within this plasma can produce γ-ray and X-ray transients (both thermal and non- thermal), in addition to the standard afterglow emission that would originate from the deceleration shock.

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