Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-12-02
AIP Conf.Proc. 727 (2004) 392-398; Prog.Theor.Phys.Suppl. 155 (2004) 387-388
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, aipTEX, contribution to the 2003 GRB Conference, held at Santa Fe, NM
Scientific paper
10.1143/PTPS.155.387
We have performed 2.5-dimensional general relativistic magnetohydrodynamic (MHD) simulations of the gravitational collapse of a magnetized rotating massive star as a model of gamma ray bursts (GRBs). This simulation showed the formation of a disk-like structure and the generation of a jet-like outflow inside the shock wave launched at the core bounce. We have found the jet is accelerated by the magnetic pressure and the centrifugal force and is collimated by the pinching force of the toroidal magnetic field amplified by the rotation and the effect of geometry of the poloidal magnetic field. The maximum velocity of the jet is mildly relativistic ($\sim$ 0.3 c).
Koide Shinji
Mizuno Yosuke
Shibata Kazunari
Yamada Shoichi
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