Photohadronic Origin of the TeV-PeV Neutrinos Observed in IceCube
Photohadronic Origin of the TeV-PeV Neutrinos Observed in IceCube
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DOI：
10.1103/physrevd.88.083007
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发表时间：
2013-07
影响因子：
5
通讯作者：
W. Winter
中科院分区：
文献类型：
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作者：
W. Winter
我们执行一个公正的搜索的起源最近观察到的28个事件以上的~30 TeV的冰立方中微子天文台，假设这些（除了大气背景）的天体物理起源产生的光强子相互作用。我们不依赖于中微子通量的标准化，而是证明光谱形状和风味成分可以用于约束或识别源类别。为了量化我们的观测结果，我们使用一个模型，其中目标光子是由同步加速电子发射产生的，我们包括磁场对次级μ子，π介子和K介子的影响。我们发现，缺乏观测到的事件的能量远大于PeV指向源与强磁场，这并不表现出最高的宇宙射线和中微子能量之间的直接相关性。虽然最简单的活动星系核模型与有效的质子加速合理地描述了目前的数据在约3sigma的置信水平，我们表明，冰立方可以排除所观察到的中微子干的超高能宇宙射线的来源与一个因素增加了10倍的统计在超过5sigma，如果目前的观测得到证实。一个可能的警告是具有强磁场和高洛伦兹因子的源，例如以磁能为主的伽玛暴。
We perform an unbiased search of the origin of the recently observed 28 events above ~30 TeV in the IceCube neutrino observatory, assuming that these are (apart from the atmospheric background) of astrophysical origin produced by photohadronic interactions. Instead of relying on the normalization of the neutrino flux, we demonstrate that spectral shape and flavor composition can be used to constrain or identify the source class. In order to quantify our observations, we use a model where the target photons are produced by the synchrotron emission of co-accelerated electrons, and we include magnetic field effects on the secondary muons, pions, and kaons. We find that the lack of observed events with energies much larger than PeV points towards sources with strong magnetic fields, which do not exhibit a direct correlation between highest cosmic ray and neutrino energies. While the simplest AGN models with efficient proton acceleration plausibly describe the current data at about the 3sigma confidence level, we show that IceCube can rule out that the observed neutrinos stem from the sources of the ultra-high energy cosmic rays with a factor of ten increased statistics at more than 5sigma if the current observations are confirmed. A possible caveat are sources with strong magnetic fields and high Lorentz factors, such as magnetic energy dominated GRBs.