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arXiv 0905.2206astro-ph.HE
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费米时代的GRB理论

GRB Theory in the Fermi Era

Jonathan Granot

摘要:

在费米伽马射线太空望远镜发射之前,只有少数几个高能(100 MeV以上)的伽马射线暴(GRB)被探测到,而对可能的高能发射地点和机制提出了几种不同的建议。在这里,我简要地回顾了一些理论预期的高能辐射的伽玛暴,概述了一些希望,以提高我们的理解伽玛暴物理通过费米观测的即时伽玛暴辐射或早期余辉(伽玛暴后的头几个小时),并总结了我们所学到的东西,到目前为止,从现有的费米伽玛暴观测(在其运行的第一个半年)。亮点包括首次探测到来自短GRB的> GeV发射,以及第一个具有> GeV发射和测量红移的GRB的详细时间和光谱信息,该GRB具有最高的测量表观(各向同性等效)辐射能量输出(对于任何伽玛暴),发射区体洛伦兹因子的最大下限,并且通过对量子引力质量设置鲁棒的下限来约束可能的洛伦兹不变性违反。

英文摘要:

Before the launch of the Fermi Gamma-ray Space Telescope there were only a handful of gamma-ray bursts (GRBs) detected at high energies (above 100 MeV), while several different suggestions have been made for possible high-energy emission sites and mechanisms. Here I briefly review some of the theoretical expectations for high-energy emission from GRBs, outline some of the hopes for improving our understanding of GRB physics through Fermi observations of the prompt GRB emission or the early afterglow (first few hours after the GRB), and summarize what we have learned so far from the existing Fermi GRB observations (over its first half-year of operation). Highlights include the first detection of > GeV emission from a short GRB, as well as detailed temporal and spectral information for the first GRB with > GeV emission and a measured redshift, that has the highest measured apparent (isotropic equivalent) radiated energy output (for any GRB), the largest lower limit on the bulk Lorentz factor of the emitting region, and constrains possible Lorentz invariance violation by placing a robust lower limit on the quantum gravity mass.

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