PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Cosmic-Ray Indirect. CRI-properties of CRs at high energies (anisotropy, energy, mass)
Evidence of Intermediate-Scale Energy Spectrum Anisotropy in the Northern Hemisphere from Telescope Array
J.P. Lundquist,* P. Sokolsky, P. Tinyakov On behalf of the Telescope Array collaboration
*corresponding author
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Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
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 $\geq$ 10$^{19.75}$ EeV is found to correspond to a deficit, or ``cold spot," of events for 10$^{19.2} \leq$ E $<$ 10$^{19.75}$ 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 3.74$\sigma$.
DOI: https://doi.org/10.22323/1.301.0513
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