| Issue |
A&A
Volume 391, Number 3, September I 2002
|
|
|---|---|---|
| Page(s) | 1141 - 1153 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20020839 | |
| Published online | 09 August 2002 | |
Efficient acceleration and radiation in Poynting flux powered GRB outflows
Max-Planck-Institut für Astrophysik, Postfach 1317, 85741 Garching bei München, Germany
Corresponding author: G. Drenkhahn, georg@mpa-garching.mpg.de
Received:
20
February
2002
Accepted:
4
June
2002
We investigate the effects of magnetic energy release by local magnetic dissipation processes in Poynting flux-powered GRBs. For typical GRB parameters (energy and baryon loading) the dissipation takes place mainly outside the photosphere, producing non-thermal radiation. This process converts the total burst energy into prompt radiation at an efficiency of 10–50%. At the same time the dissipation has the effect of accelerating the flow to a large Lorentz factor. For higher baryon loading, the dissipation takes place mostly inside the photosphere, the efficiency of conversion of magnetic energy into radiation is lower, and an X-ray flash results instead of a GRB. We demonstrate these effects with numerical one-dimensional steady relativistic MHD calculations.
Key words: gamma rays: bursts / magnetic fields / magnetohydrodynamics (MHD) / stars: winds, outflows
© ESO, 2002
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