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ID: 5497.0, MPI für Astrophysik / High Energy Astrophysics at MPA
Efficient acceleration and radiation in Poynting flux powered GRB outflows
Authors:Drenkhahn, G.; Spruit, H. C.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Volume:391
Issue / Number:3
Start Page:1141
End Page:1153
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:gamma rays : bursts; magnetic fields; magnetohydrodynamics (MHD); stars : winds; outflows
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Max Planck Inst Astrophys, Postfach 1317, D-85741 Garching,; Germany; Max Planck Inst Astrophys, D-85741 Garching, Germany
Identifiers:ISI:000177590500032
ISSN:0004-6361
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