| Title: | Evidence of Intermediate-Scale Energy Spectrum Anisotropy of Cosmic Rays E>10^19.2 eV with the Telescope Array Surface Detector |
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| Authors: | ID Lundquist, Jon Paul, UNG (Author) |
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| Files: |  https://meetings.aps.org/Meeting/APR18/Session/L01.78
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.12 - Published Scientific Conference Contribution Abstract |
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| Organization: | UNG - University of Nova Gorica
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| 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). |
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| Keywords: | UHECR, cosmic rays, energy spectrum, anisotropy |
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| Place of performance: | APS April Meeting |
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| Year of performance: | 2018 |
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| PID: | 20.500.12556/RUNG-5169-e78bf67a-89fe-f0c5-3e49-c0cc52df858d  |
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| COBISS.SI-ID: | 13026307 |
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| NUK URN: | URN:SI:UNG:REP:OZZRWOMT |
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| Publication date in RUNG: | 29.04.2020 |
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| Views: | 3358 |
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| Downloads: | 83 |
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| Metadata: |    |
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