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arXiv 1003.4710astro-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

Julia K. Becker, Francis Halzen, Aongus O'Murchadha, Martino 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,没有观测证据表明它们加速了强子。费米GST最近观察到两个爆发,表现出典型的(带)光子光谱的幂律高能扩展,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。由于中微子的检测是唯一明确的方式来建立伽玛暴加速质子,我们使用两种方法来估计中微子流量时,他们与火球光子相互作用,产生带电π介子和中微子。虽然到目前为止,从费米爆发中探测到的事件数量很少,但我们得出结论,如果伽马射线暴确实是观测到的宇宙射线的来源,那么冰立方中微子望远镜将探测到像GRB 941017这样的事件。

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 that they accelerate hadrons. The Fermi GST recently observed two bursts that exhibit a power-law high-energy extension of the typical (Band) photon 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 protons, we use two methods to estimate the neutrino flux produced when they interact with fireball photons to produce charged pions and neutrinos. While the number of events expected from the Fermi bursts detected to date is small, we conclude that an event like GRB941017 will be detected by the IceCube neutrino telescope if gamma-ray bursts are indeed the sources of the observed cosmic rays.

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