SLOW HEATING MODEL OF GAMMA-RAY BURST: PHOTON SPECTRUM AND DELAYED EMISSION
SLOW HEATING MODEL OF GAMMA-RAY BURST: PHOTON SPECTRUM AND DELAYED EMISSION
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DOI：
10.1088/0004-637x/705/2/1714
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
K. Asano;T. Terasawa
中科院分区：
文献类型：
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作者：
K. Asano;T. Terasawa
我们提出了一种新的伽马射线暴快速发射机制。在我们的模型中，电子通过等离子体湍流在激波后区域不断加速。利用蒙特卡罗方法，我们模拟了等离子体湍流引起的二阶费米加速，得到了光子谱。由于加速度与同步辐射冷却是平衡的，所以可以很自然地解释观测到的低能谱指数。所得到的光谱至少可以在∼1 MeV以下与观测光谱一致。该模型还预测了在某些情况下，由于逆康普顿和宽脉冲分布的光发射而导致的GeV-TeV延迟发射。虽然重现MeV-GeV幂定律谱需要非平凡的假设，但该模型暗示了解释各种光度关联的可能性。
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 ∼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 of explaining various kinds of luminosity correlations.