Abstract Many Galactic sources of gamma rays, such as supernova remnants, are expected to produce neutrinos with a typical energy cutoff well below 100 TeV. For the IceCube Neutrino Observatory located at the South Pole, the southern sky, containing the inner part of the Galactic plane and the Galactic Center, is a particularly challenging region at these energies, because of the large background of atmospheric muons. In this paper, we present recent advancements in data selection strategies for track-like muon neutrino events with energies below 100 TeV from the southern sky. The strategies utilize the outer detector regions as veto and features of the signal pattern to reduce the background of atmospheric muons to a level which, for the first time, allows IceCube searching for point-like sources of neutrinos in the southern sky at energies between 100 GeV and several TeV in the muon neutrino charged current channel. No significant clustering of neutrinos above background expectation was observed in four years of data recorded with the completed IceCube detector. Upper limits on the neutrino flux for a number of spectral hypotheses are reported for a list of astrophysical objects in the southern hemisphere.

中文翻译：

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来自南方天空的低于 100 TeV 的中微子采用精细的否决技术对冰立方数据

摘要 许多银河系伽马射线源，如超新星遗迹，预计会产生典型能量截止远低于 100 TeV 的中微子。对于位于南极的冰立方中微子天文台来说，包含银河平面内部和银河中心的南部天空在这些能量下是一个特别具有挑战性的区域，因为大气μ子的背景很大。在这篇论文中，我们展示了来自南方天空的能量低于 100 TeV 的轨道状 μ 中微子事件的数据选择策略的最新进展。该策略利用外部探测器区域作为否决权和信号模式的特征，将大气 μ 子的背景降低到一个水平，这是第一次，允许 IceCube 在带电的介子中微子电流通道中以 100 GeV 和几个 TeV 之间的能量在南部天空中搜索点状中微子源。在用完整的 IceCube 探测器记录的四年数据中，没有观察到明显高于背景预期的中微子聚集。南半球的一系列天体物理天体报告了许多光谱假设的中微子通量上限。