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arXiv 1107.5575astro-ph.HEastro-ph.COhep-ph
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随机加速度在伽马射线暴瞬发中的作用:应用于强子注入

The Role of Stochastic Acceleration in the Prompt Emission of Gamma-Ray Bursts: Application to Hadronic Injection

Kohta Murase, Katsuaki Asano, Toshio Terasawa, Peter Meszaros

摘要:

本文采用解析和数值计算相结合的方法,在伽马射线暴(GRB)瞬发的强子-轻子混合模型的背景下,研究了激波后区域中粒子通过磁流体动力学/等离子体湍流的再加速(或加热)效应。我们证明了通过pp和pg反应以及随后的成对级联注入的随机加速(或加热)轻子,在~MeV范围内可以再现α ~1和β ~2-3的带函数谱。一个额外的硬组件来自质子诱导的级联发射,同时预期,这是兼容的观察到的额外的幂律谱远高于MeV的范围。我们还讨论了强子模型对正在进行的高能中微子观测的具体影响。

英文摘要:

We study effects of particle re-acceleration (or heating) in the post-shock region via magnetohydrodynamic/plasma turbulence, in the context of a mixed hadronic-leptonic model for the prompt emission of gamma-ray bursts (GRBs), using both analytical and numerical methods. We show that stochastically accelerated (or heated) leptons, which are injected via pp and pg reactions and subsequent pair cascades, are plausibly able to reproduce the Band function spectra with alpha~1 and beta~2-3 in the ~MeV range. An additional hard component coming from the proton-induced cascade emission is simultaneously expected, which is compatible with observed extra power-law spectra far above the MeV range. We also discuss the specific implications of hadronic models for ongoing high-energy neutrino observations.

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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