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arXiv 0905.1392astro-ph.HE
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伽马射线暴的慢加热模型:光子谱和延迟辐射

Slow Heating Model of Gamma-Ray Burst: Photon Spectrum and Delayed Emission

K. Asano, T. Terasawa

摘要:

提出了一种新的伽马射线暴瞬发机制。在我们的模型中,电子通过等离子体湍流在激波后区域被连续加速。用蒙特卡罗方法模拟了等离子体湍流引起的二阶费米加速,得到了光子谱。由于加速与同步辐射冷却平衡,自然解释了观测到的低能光谱指数。得到的光谱可以与观察到的光谱一致,至少低于$\sim 1$ MeV。该模型还预测延迟GeV-TeV的发射由于逆康普顿和宽脉冲轮廓的光发射在某些情况下。虽然需要非平凡的假设来再现MeV-GeV幂律谱,但该模型暗示了解释各种光度相关性的可能性。

英文摘要:

We propose a new mechanism for the prompt emission of gamma-ray burst. In our model electrons are continuously accelerated in the post shock region via plasma turbulence. Using the Monte Carlo technique, we mimic the second-order Fermi acceleration due to plasma turbulence and obtain photon spectra. Since the acceleration balances with the synchrotron cooling, the observed low-energy spectral index is naturally explained. The resultant spectra can be consistent with observed spectra at least below $\sim 1$ MeV. The model also predicts delayed GeV-TeV emission due to inverse Compton and broad pulse profile of optical emission in some cases. Although nontrivial assumptions are required to reproduce MeV-GeV power-law spectra, the model implies the possibility to explain various kinds of luminosity correlations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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