Abstract
Interaction of a fast shock wave generated during a supernova explosion with a magnetized star-companion of the supernova precursor produces a current sheet. We consider an evolution of this current sheet and show that a singularity (shock) is formed in finite time within the ideal magnetohydrodynamics framework. Charged particles (electrons) are accelerated in the vicinity of the singularity, and their distribution function has a plateau up to the energies of the order of 104mc2. These fast particles radiate in the γ-range in the strong magnetic field of the current sheet (B ≃ 106 G). Radiation is concentrated within a narrow angle around the current sheet, Δθ ≃ 3 × 10−4, and its spectrum has the maximum at several hundreds of keV. Presented calculations confirm the model of cosmological GRBs proposed earlier by Istomin & Komberg.
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