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Evidence of intermediate-scale energy spectrum anisotropy in the northern hemisphere from telescope array

par Lundquist, Jon Paul;Sokolsky, Pierre;Tiniakov, Petr
Référence Pos proceedings of science, Part F135186
Publication Publié, 2017

Article révisé par les pairs

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Résumé :

Evidence of an energy dependent intermediate-scale anisotropy has been found in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere, using 7 years of TA surface detector data. The previously reported "hot spot" excess E ≥ 1019.75 EeV is found to correspond to a deficit, or "cold spot," of events for 1019.2 ≤ E < 1019.75 EeV. This feature suggests energy dependent magnetic deflection of cosmic-rays. The global post-trial significance of the energy spectrum deviation is found to be 3.74σ.