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arXiv 1802.09983astro-ph.HEhep-ph
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多信使gamma-ray对应于IceCube中微子信号

Multi-messenger gamma-ray counterpart of the IceCube neutrino signal

A. Neronov, M. Kachelriess, D. V. Semikoz

摘要:

冰立方实验最近发现了一个来自未知来源的高能地外中微子信号。中微子总是与伽马射线一起产生,但是来自河外源的伽马射线通量由于在星系际介质中的衰减而被抑制。我们报告发现的伽马射线过剩在银河系高纬度地区开始在能量300 GeV的费米望远镜的数据。我们表明,多TeV的伽马射线漫发射的光谱特性在低和高银河系纬度兼容的冰立方高中微子信号在同一天空区域。这表明这些伽马射线是冰立方中微子信号的对应物,这意味着冰立方中微子通量的相当大一部分来自银河系。我们认为,在银河系高纬度地区的扩散中微子和γ射线信号起源于以前未知的附近的宇宙射线“PeVatron”源(S),一个扩展的银河系CR晕或从重暗物质粒子的衰变。

英文摘要:

A signal of high-energy extraterrestrial neutrinos from unknown source(s) was recently discovered by the IceCube experiment. Neutrinos are always produced together with gamma-rays, but the gamma-ray flux from extragalactic sources is suppressed due to attenuation in the intergalactic medium. We report the discovery of a gamma-ray excess at high Galactic latitudes starting at energies 300 GeV in the data of the Fermi telescope. We show that the multi-TeV gamma-ray diffuse emission has spectral characteristics at both low and high Galactic latitudes compatible with those of the IceCube high neutrino signal in the same sky regions. This suggests that these gamma-rays are the counterpart of the IceCube neutrino signal, implying that a sizable part of the IceCube neutrino flux originates from the Milky Way. We argue that the diffuse neutrino and gamma-ray signal at high Galactic latitudes originates either from previously unknown nearby cosmic ray "PeVatron" source(s), an extended Galactic CR halo or from decays of heavy dark matter particles.

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