Spectra of Poynting-flux powered GRB outflows

Details Spectra of Poynting-flux powered GRB outflows Spectra of Poynting-flux powered GRB outflows

2004-01-08

arxiv.org/abs/astro-ph/0401109v2

Astron.Astrophys.430:1-7,2005

Astronomy and Astrophysics

Astrophysics

Section 3 revised, typos corrected, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20047033

We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB ouflow. The very high magnetic field strengths (super-equipartition) in such a flow lead to very efficient synchrotron emission. In contrast with internal shocks, dissipation of magnetic energy by reconnection is gradual and does not produce the spectrum of cooling electrons associated with shock acceleration.We show that a spectrum with a break in the BATSE energy range is produced, instead, if the magnetic dissipation heats a small (\sim 10^{-4}) population of electrons.

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