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arXiv 0911.2202astro-ph.HE
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高能分量伽马射线暴的中微子发射

Neutrino emission from high-energy component gamma-ray bursts

J. K. Becker, F. Halzen, A. O'Murchadha, M. Olivo

摘要:

伽马射线暴有可能产生粒子能量(高达$10^{21}$ eV)和能量收支($10^{44} \rm{erg yr^{-1} Mpc^{-3}}$),以适应最高能量宇宙射线的光谱;另一方面,还没有观测证据表明它们加速了强子。费米最近观察到两个爆发,它们表现出典型(能带)谱的幂律高能扩展,扩展到$\sim 30$ GeV。在火球现象的基础上,我们认为,它们与EGRET在1994年观测到的GRB 941017一起,显示了相当大的重子负载的间接证据。由于中微子的探测是确定伽玛暴加速宇宙射线的唯一明确的方法,我们使用两种方法来估计重子与火球光子相互作用产生带电π介子和中微子时产生的中微子通量。虽然费米爆发预期的事件数量很小,但我们得出结论,如果伽马射线暴确实是宇宙射线的来源,那么像GRB 941017这样的事件将被IceCube探测到。

英文摘要:

Gamma-ray bursts have the potential to produce the particle energies (up to $10^{21}$ eV) and the energy budget ($10^{44} \rm{erg yr^{-1} Mpc^{-3}}$) to accommodate the spectrum of the highest energy cosmic rays; on the other hand, there is no observational evidence yet that they accelerate hadrons. Fermi recently observed two bursts that exhibit a power-law high-energy extension of the typical (Band) spectrum that extends to $\sim 30$ GeV. On the basis of fireball phenomenology we argue that they, along with GRB941017 observed by EGRET in 1994, show indirect evidence for considerable baryon loading. Since the detection of neutrinos is the only unambiguous way to establish that GRBs accelerate cosmic rays, we use two methods to estimate the neutrino flux produced when the baryons interact with fireball photons to produce charged pions and neutrinos. While the number of events expected from the Fermi bursts is small, we conclude that an event like GRB941017 will be detected by IceCube if gamma-ray bursts are indeed the sources of the cosmic rays.

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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