Spectra of Poynting-flux powered GRB outflows

被引：89

作者：

Giannios, D

Spruit, HC

机构：

[1] Max Planck Inst Astrophys, D-85741 Garching, Germany

[2] Univ Crete, Dept Phys, Iraklion 71003, Crete, Greece

[3] Fdn Res & Technol Hellas, Iraklion 71110, Crete, Greece

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 430卷 / 01期

关键词：

gamma rays : bursts; magnetohydrodynamics (MHD); radiation mechanisms : non-thermal;

D O I：

10.1051/0004-6361:20047033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the production of the gamma-ray spectrum of a Poynting-flux dominated GRB outflow. 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 (similar to10(-4)) population of electrons.

引用

页码：1 / 7

页数：7

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