Particle Astrophysics seminar

Department of Physics Calendar
Wed, Jun 13, 2018 2:00 pm - 3:00 pm
PSC Rm 3150


Title : Evidence of an Intermediate-Scale Energy Spectrum Anisotropy of Cosmic Rays E≥10^19.2 eV with the Telescope Array Surface Detector
Speaker Name: Jonathan Paul Lundquist
Speaker Institution : University of Utah
Abstract : Evidence for an intermediate-scale energy spectrum anisotropy has been found in the arrival
directions of ultra-high energy cosmic rays for energies greater than 10^19.2 eV the northern
hemisphere using 7 years of TA surface detector data. The previously reported “Hotspot" excess
of events E≥10^19.75 eV is found to correspond to a deficit, or “Coldspot," of events for
10^19.2≤E<10^19.75 eV. This feature may suggest energy dependent magnetic deflection of cosmic

rays. The post-trial significance of the energy spectrum deviation is found to be 3.74σ.

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