The origin of the relativistic wind in gamma-ray bursts: MHD flow from a disk orbiting a stellar mass black hole ?

Details The origin of the relativistic wind in gamma-ray bursts: MHD flow from a disk orbiting a stellar mass black hole ? The origin of the relativistic wind in gamma-ray bursts: MHD flow from a disk orbiting a stellar mass black hole ?

1999-07-21

arxiv.org/abs/astro-ph/9907289v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the 19th Texas Symposium (6 pages, 2 eps figures, uses texas.sty)

Scientific paper

We compute the mass loss rate from a disk orbiting a stellar mass black hole assuming the flow is guided along magnetic field lines attached to the disk. We then estimate the Lorentz factor of the wind at infinity. We find that the Lorentz factor can reach high values only if severe constraints on the field geometry and the conditions of energy injection are satisfied. We discuss our results in the context of different scenarios for gamma-ray bursts. We mention a risk of 'contamination' of the Blandford-Znajek process by wind material emitted from the disk.

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