Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..565m&link_type=abstract
GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 565-569 (2000).
Physics
8
Jets And Bursts, Galactic Winds And Fountains, Black Holes, Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
Using a collapsar progenitor model of MacFadyen & Woosley we have simulated the propagation of an axisymmetric relativistic jet through a collapsing rotating massive star. The jet forms as a consequence of an assumed constant or variable energy deposition in the range 1050 erg s-1 to 1051 erg s-1 within a 30° cone around the rotation axis. The jet flow is strongly beamed (<~ few degrees), spatially inhomogeneous, and time dependent. The jet reaches the surface of the stellar progenitor (R*=2.98×1010 cm) intact with a maximum Lorentz factor Γmax=33. After break-out the jet accelerates into the circumstellar medium, whose density is assumed to decrease exponentially and then being constant. Outside the star the flow also expands laterally (v~c), but the beam remains very well collimated. At a distance of 2.54×R*, where we had to stop the simulation, the Lorentz factor has increased to 44. .
Aloy Miguel Angel
Ibáñez José Ma
MacFadyen Andrew
Martí José Ma
Müller Ewald
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