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Title:Evidence of Intermediate-Scale Energy Spectrum Anisotropy of Cosmic Rays E>10^19.2 eV with the Telescope Array Surface Detector
Authors:ID Lundquist, Jon Paul, UNG (Author)
Files:URL https://meetings.aps.org/Meeting/APR18/Session/L01.78
 
Language:English
Work type:Not categorized
Typology:1.12 - Published Scientific Conference Contribution Abstract
Organization:UNG - University of Nova Gorica
Abstract:Evidence of an intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays of energies above 10^19.2 eV in the northern hemisphere, using 7 years of Telescope Array (TA) surface detector (SD) data. A relative energy distribution test is done comparing events inside oversampled spherical caps of equal exposure, to those outside, using the Poisson likelihood ratio. The center of maximum significance is at 139 R.A., 45 Dec., and has a deficit of events with energies 10^19.2<E<10^19.75 eV and an excess for E>10^19.75 eV. The post-trial probability of this energy anisotropy, appearing by chance anywhere on an isotropic sky, is found by Monte Carlo (MC) simulation to be 9x10^-5 (3.74 σ_global).
Keywords:UHECR, cosmic rays, energy spectrum, anisotropy
Place of performance:APS April Meeting
Year of performance:2018
PID:20.500.12556/RUNG-5169-e78bf67a-89fe-f0c5-3e49-c0cc52df858d New window
COBISS.SI-ID:13026307 New window
NUK URN:URN:SI:UNG:REP:OZZRWOMT
Publication date in RUNG:29.04.2020
Views:2548
Downloads:82
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