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arXiv 0811.2163astro-ph
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伽马射线暴E_p-E_gamma关系的外激波起源

An external-shock origin of the E_p-E_gamma relation for Gamma-Ray Bursts

A. Panaitescu

摘要:

我们研究了长持续时间γ暴的nuF_nu谱的峰值能量E_p与能量输出E_gamma之间的E_p propto E_gamma ^{1/2}关系是由相对论外流与周围介质相互作用产生的外激波引起的可能性。为此,我们考虑了决定E_p和E_gamma的所有参数对周围介质密度径向分布的依赖性,发现如果伽玛暴周围的介质具有普遍的径向分层,则E_p-E_gamma关系可以得到解释。对于不同的伽玛暴辐射过程(同步加速或逆康普顿)和耗散机制(反向或正向激波)的组合,我们发现环爆介质的粒子密度径向分布必须不同于在质量损失率和终端速度恒定的情况下所期望的R ^{-2}。

英文摘要:

We investigate the possibility that the E_p propto E_gamma^{1/2} relation between the peak energy E_p of the nuF_nu spectrum and energy output E_gamma for long-duration GRBs arises from the external shock produced by the interaction of a relativistic outflow with the ambient medium. To that aim, we take into account the dependence of all parameters which determine E_p and E_gamma on the radial distribution of the ambient medium density and find that the E_p-E_gamma relation can be explained if the medium around GRBs has a universal radial stratification. For various combinations of GRB radiative process (synchrotron or inverse-Compton) and dissipation mechanism (reverse or forward shock), we find that the circumburst medium must have a particle density with a radial distribution different than the R^{-2} expected for constant mass-loss rate and terminal speed.

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