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arXiv 1606.04489astro-ph.HEhep-ph
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不同cosmic ray分布的高能弥散银河中微子的期望

Expectations for high energy diffuse galactic neutrinos for different cosmic ray distributions

G. Pagliaroli, C. Evoli, F. L. Villante

摘要:

宇宙射线与我们银河系中的气体相互作用是扩散高能中微子的可靠来源。我们提供了这个组件的期望,考虑不同的假设宇宙射线在银河系中的分布,旨在涵盖宇宙射线传播模型中的大的不确定性。考虑探测器角分辨率的影响,计算了扩散银河中微子流的角依赖性和冰立方中高能起始事件的对应率。此外,我们还讨论了从各向同性天体物理流量中区分银河分量的可能性。我们表明,从银道面在目前的冰立方数据的统计上显着过剩的事件将有利于模型,其中在银河系内区域的宇宙射线密度远大于其本地值,从而带来有关的宇宙射线径向分布的信息。

英文摘要:

The interaction of cosmic rays with the gas contained in our Galaxy is a guaranteed source of diffuse high energy neutrinos. We provide expectations for this component by considering different assumptions for the cosmic ray distribution in the Galaxy which are intended to cover the large uncertainty in cosmic ray propagation models. We calculate the angular dependence of the diffuse galactic neutrino flux and the corresponding rate of High Energy Starting Events in IceCube by including the effect of detector angular resolution. Moreover we discuss the possibility to discriminate the galactic component from an isotropic astrophysical flux. We show that a statistically significant excess of events from the galactic plane in present IceCube data would favour models in which the cosmic ray density in the inner galactic region is much larger than its local value, thus bringing relevant information on the cosmic ray radial distribution.

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