Speaker
Description
The Telescope Array (TA) experiment has reported evidence of an intermediate-scale excess in the arrival directions of ultrahigh-energy cosmic rays (UHECRs) with energies above 57 EeV, known as the TA Hotspot. Initially reported in 2014, this excess continues to be observed with a statistical significance of approximately 3$\sigma$. However, the astrophysical origin of this excess remains unclear. To investigate potential UHECR sources contributing to this excess, we searched for multiplets--patterns in arrival directions correlated with energy due to deflection in cosmic magnetic fields. In a multiplet, higher-energy events appear closer to the source direction, while lower-energy events are deflected further from the source. Using the latest data collected by the TA surface detectors, we conducted a detailed analysis to identify multiplets and assess their correlation with possible astrophysical sources. Our results and their implications for the origin of the TA hotspot are discussed in detail.
| Collaboration(s) | The Telescope Array Collaboration |
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