IceCube data from 2008 to 2017 related to analysis of TXS 0506+056
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A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. The analysis of this association was reported in Science (DOI:10.1126/science.aat1378). Prompted by this association, IceCube investigated 9.5 years of data recorded in the direction of this blazar to search for additional evidence of neutrino emission. The data consisted of six existing neutrino data samples used for point source searches, from 5 April 2008 until 31 October 2017. An excess of high-energy neutrino events with respect to atmospheric backgrounds at the coordinates of TXS 0506+056 was found between September 2014 and March 2015. Allowing for time-variable flux, this constituted 3.5sigma evidence for neutrino emission from the direction of TXS 0506+056, independent of and prior to the 2017 flaring episode.
2017年9月22日被冰立方(IceCube)探测到的一例高能中微子事件,在方位与时间上均与耀变体(blazar)TXS 0506+056的伽马射线耀斑相吻合。该项关联现象的分析成果已发表于《科学》(Science)期刊(DOI:10.1126/science.aat1378)。受此发现启发,冰立方对该耀变体方向上记录的9.5年观测数据开展了排查工作,以搜寻额外的中微子辐射证据。该数据集涵盖2008年4月5日至2017年10月31日期间用于点源搜索(point source searches)的六组已公开中微子数据样本。研究团队在2014年9月至2015年3月期间,于TXS 0506+056的天球坐标处发现了超出大气背景预期的高能中微子事件超额信号。考虑到辐射通量随时间变化的情况,该信号为来自TXS 0506+056方向的中微子辐射提供了3.5σ的统计显著性证据,该证据独立于2017年的耀斑事件,且早于该耀斑的发生。




