Volume 391, Number 3, September I 2002
|Page(s)||1141 - 1153|
|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, email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.