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arXiv 0812.1845astro-ph
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中子星的TeV中微子和γ射线

TeV neutrinos and gamma rays from pulsars

A. Bhadra, R. K. Dey

摘要:

最近的研究表明,脉冲星可能是TeV μ子中微子的强源,只要正离子被脉冲星极帽加速到PeV能量。在这种情况下,μ介子中微子是通过脉冲星加速离子与其热辐射场相互作用的δ共振产生的。在脉冲星环境中,高能γ射线也应该同时产生,因为带电和中性π介子都是在高能强子与周围光子场的相互作用中产生的。在这里,我们估计TeV伽马射线通量在地球附近的一些年轻的恒星。通过与观测值的比较,我们发现在通量计算中适当考虑极帽几何形状的影响是很重要的。由于地球附近几乎没有潜在的恒星,我们得到了(修正后的)地球上的事件发生率。结果表明,中微子星不太可能被即将到来的中微子望远镜探测到。我们还估计了TeV的伽马射线和中微子通量的脉冲星星云采用的粒子加速模型。

英文摘要:

Recent studies suggest that pulsars could be strong sources of TeV muon neutrinos provided positive ions are accelerated by pulsar polar caps to PeV energies. In such a situation muon neutrinos are produced through the delta resonance in interactions of pulsar accelerated ions with its thermal radiation field. High energy gamma rays also should be produced simultaneously in pulsar environment as both charged and neutral pions are generated in the interactions of energetic hadrons with the ambient photon fields. Here we estimate TeV gamma ray flux at Earth from few nearby young pulsars. When compared with the observations we find that proper consideration of the effect of polar cap geometry in flux calculation is important. Incorporating such an effect we obtain the (revised) event rates at Earth due to few potential nearby pulsars. The results suggest that pulsars are unlikely to be detected by the upcoming neutrino telescopes. We also estimate TeV gamma ray and neutrino fluxes from pulsar nebulae for the adopted model of particle acceleration.

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