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- W1552754641 abstract "We consider the conditions within a Gamma-Ray Burst (GRB) emission region that is Poynting flux dominated. Due to the enormous magnetic energy density, relativistic electrons will cool in such a region extremely rapidly via synchrotron. As there is no known mechanism that can compete with synchrotron it must be the source of the prompt sub-MeV emission. This sets strong limits on the size and Lorentz factor of the outflow. Furthermore, synchrotron cooling is too efficient. It overproduces optical and X-ray as compared with the observations. This overproduction of low energy emission can be avoided if the electrons are re-accelerated many times ($gtrsim 5times 10^4$)during each pulse (or are continuously heated) or if they escape the emitting region before cooling down. We explore the limitations of both models practically ruling out the later and demonstrating that the former requires two different acceleration mechanisms as well as an extremely large magnetic energy to Baryonic energy ratio. To be viable, any GRB model based on an emission region that is Poynting flux dominated must demonstrate how these conditions are met. We conclude that if GRB jets are launched magnetically dominated they must dissipate somehow most of their magnetic energy before they reach the emission region." @default.
- W1552754641 created "2016-06-24" @default.
- W1552754641 creator A5001538936 @default.
- W1552754641 creator A5083349832 @default.
- W1552754641 date "2014-10-31" @default.
- W1552754641 modified "2023-09-24" @default.
- W1552754641 title "The emission mechanism in magnetically dominated gamma-ray burst outflows" @default.
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- W1552754641 doi "https://doi.org/10.1093/mnras/stu2032" @default.
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