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GRB CENTRAL ENGINES AS MAGNETICALY DRIVEN COLLAPSAR MODEL

In this work we describe the results of our numerical study on the possibility of magnetic origin of relativistic jets of long duration gamma ray bursters within the collapsar scenario. We track the collapse of massive rotating stars onto a rotating central black hole using axisymmetric general relativistic magnetohydrodynamic code that utilizes a realistic equation of state of stellar matter, takes into account the cooling associated with emission of neutrinos, and the energy losses due to dissociation of nuclei. We describe the solutions for several models where the progenitor star has magnetic field flux from $\Psi=10^{27}$G cm$^{2}$ to $B=6\times 10^{28}$G cm$^{2}$. The some solution exhibits strong explosion driven by the Poynting-dominated jets whose power exceeds up to $12\times10^{51}\,\mbox{erg/s}$. The jets originate mainly from the black hole and they are powered via the Blandford-Znajek mechanism. We discuss realistic initial conditions for BH and collapsing envelop.

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