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arXiv 0705.2910astro-ph
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高能质子、μ子和电子-正电子对引起的伽马射线暴的瞬发GeV-TeV

Prompt GeV-TeV Emission of Gamma-Ray Bursts Due to High-Energy Protons, Muons and Electron-Positron Pairs

Katsuaki Asano, Susumu Inoue

摘要:

在内部冲击情景的框架内,我们利用蒙特卡罗模拟,包括各种过程与电子和质子加速到高能量的宽带伽马射线暴(GRB)的快速发射的GeV-TeV带的重点。虽然来自初级电子的逆康普顿发射通常占主导地位,但不同的质子诱导机制也可以产生不同的高能成分,例如来自质子、μ子或通过光生子相互作用注入的次级电子/正电子的同步辐射。在某些情况下,它们会产生双重光谱断裂,可以作为超高能质子的独特特征。我们讨论了有利于这种发射的条件,以及它们与内激波中超高能宇宙射线和中微子的产生之间的关系。正在进行和即将进行的{ \it GLAST}、大气切伦科夫望远镜和其他设施的观测将检验这些预期,并提供有关伽马射线暴外流物理条件的重要信息。

英文摘要:

In the framework of the internal shock scenario, we model the broadband prompt emission of gamma-ray bursts (GRBs) with emphasis on the GeV-TeV bands, utilizing Monte Carlo simulations that include various processes associated with electrons and protons accelerated to high energies. While inverse Compton emission from primary electrons is often dominant, different proton-induced mechanisms can also give rise to distinct high-energy components, such as synchrotron emission from protons, muons or secondary electrons/positrons injected via photomeson interactions. In some cases, they give rise to double spectral breaks that can serve as unique signatures of ultra-high-energy protons. We discuss the conditions favorable for such emission, and how they are related to the production of ultra-high-energy cosmic rays and neutrinos in internal shocks. Ongoing and upcoming observations by {\it GLAST}, atmospheric Cerenkov telescopes and other facilities will test these expectations and provide important information on the physical conditions in GRB outflows.

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