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Time-independent searches for astrophysical neutrino sources with the combined data of 40 and 59 strings of IceCube

机译：使用40和59串IceCube的组合数据以时间无关的方式搜索天体中微子源

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We present the results of time-independent searches for astrophysical neutrino sources performed over the whole sky using data collected between April 2008 and May 2010 with the 40-string and 59-string configurations of the IceCube Neutrino Observatory. Muon tracks arriving in the detector from neutrino interactions are reconstructed using the time and charge information detected by an array of photomultiplier tubes (PMTs). In the northern sky, the data sample consists of 14,121 events collected with 40 strings and 43,339 with 59 strings, mostly muons induced by atmospheric neutrinos. In this sky region the search is sensitive to point sources of neutrinos with E.2 spectra mainly in the TeV-PeV energy range. In the opposite hemisphere, a much larger background of high-energy atmospheric muons dominate the data set. A zenith dependent energy cut is used to reduce the number of background events. This weakens the sensitivity for point sources with E.2 spectra with respect to the upgoing region. The downgoing region is more sensitive to harderspectrum sources for which the bulk of events can be detected between PeV-EeV energies. An unbinned maximum likelihood ratio test is used to search for astrophysical signals. For the first time it was adapted to combine data from different detector configurations. The combined sensitivity is about a factor 2.5 better than the previous 1-year limit of the 40-string configuration alone. A dedicated search based on a catalog of sources is also presented.
机译：我们使用在2008年4月至2010年5月之间收集的数据以及IceCube Neutrino天文台的40弦和59弦配置，对整个天体的天体中微子源进行了不依赖时间的搜索结果。从中微子相互作用到达探测器的μ子轨道使用光电倍增管（PMT）阵列检测到的时间和电荷信息进行重构。在北部的天空中，数据样本包含40条弦收集的14,121个事件和59条弦收集的43,339个事件，其中大多数是由大气中微子引起的μ子。在这个天空区域中，搜索对具有E.2光谱的中微子的点源敏感，主要在TeV-PeV能量范围内。在对面的半球中，高能大气μ子的背景要大得多。使用与天顶有关的能量削减来减少背景事件的数量。这减弱了相对于上行区域具有E.2光谱的点源的灵敏度。下行区域对较硬的光谱源更为敏感，对于这些光谱源，可以在PeV-EeV能量之间检测到大量事件。未绑定的最大似然比检验用于搜索天体信号。这是第一次将来自不同检测器配置的数据进行组合。组合灵敏度比以前单独使用40弦琴的1年极限高约2.5倍。还提供了基于源目录的专用搜索。

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