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arXiv 1706.07047astro-ph.HEastro-ph.COastro-ph.GAhep-ph
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来自附近射电星系的高能γ射线和中微子

High-Energy Gamma Rays and Neutrinos from Nearby Radio Galaxies

Carlos Blanco, Dan Hooper

摘要:

多信使数据表明,射电星系(即非耀变体活动星系)可能是冰立方合作组织报告的高能中微子扩散通量最有可能的来源。在这项研究中,我们考虑从附近的四个射电星系(半人马座A,PKS 0625-35,NGC 1275和IC 310)观测到的伽马射线光谱,并限制从这些源注入的发射的强度和光谱形状,占电磁级联(在射电星系本身和河外传播过程中启动)的衰减和贡献的影响。假设这种伽马射线发射主要是通过宇宙射线质子与气体的相互作用产生的,我们计算了从这些来源中预测的中微子通量。虽然这种情况是一致的,由IceCube和ANTARES合作发布的约束,预测通量始终落在当前点源灵敏度的一个数量级内。对于未来探测最近射电星系的中微子发射来说,前景是非常令人鼓舞的。

英文摘要:

Multi-messenger data suggest that radio galaxies (i.e. non-blazar active galaxies) are perhaps the most likely class of sources for the diffuse flux of high-energy neutrinos reported by the IceCube Collaboration. In this study, we consider the gamma-ray spectrum observed from four nearby radio galaxies (Centaurus A, PKS 0625-35, NGC 1275 and IC 310) and constrain the intensity and spectral shape of the emission injected from these sources, accounting for the effects of attenuation and contributions from electromagnetic cascades (initiated both within the radio galaxy itself and during extragalactic propagation). Assuming that this gamma-ray emission is generated primarily through the interactions of cosmic-ray protons with gas, we calculate the neutrino flux predicted from each of these sources. Although this scenario is consistent with the constraints published by the IceCube and ANTARES Collaborations, the predicted fluxes consistently fall within an order of magnitude of the current point source sensitivity. The prospects appear very encouraging for the future detection of neutrino emission from the nearest radio galaxies.

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