| Title: | UHECR mass composition from anisotropy of their arrival directions with the Telescope Array SD |
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| Authors: | ID Kuznetsov, M. (Author)
ID Lundquist, Jon Paul (Author), et al. |
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| Files: |  ICRC2021_294.pdf (3,02 MB)
MD5: 5592BF706E639D5EB4068686AD693AA3
 https://pos.sissa.it/395/294/
https://pos.sissa.it/395/294/pdf
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | We propose a new method for the estimation of ultra-high energy cosmic ray (UHECR) mass composition from a distribution of their arrival directions. The method employs a test statistic (TS) based on a characteristic deflection of UHECR events with respect to the distribution of luminous matter in the local Universe modeled with a flux-weighed 2MRS catalog. Making realistic simulations of the mock UHECR sets, we show that this TS is robust to the presence of galactic and non-extreme extra-galactic magnetic fields and sensitive to the mass composition of events in a set.
We apply the method to Telescope Array surface detector data for 11 years and derive new independent constraints on fraction of protons and iron in p-Fe mix at E>10 EeV. At 10<E<100 EeV the data favors increase of allowed proton fraction and decrease of allowed iron fraction, while at E>100 EeV --- pure iron or even more massive composition. This result is in tension with Auger composition model inferred from spectrum-Xmax fit at 2.7σ (2.0σ) for PT'11 (JF'12) regular GMF model. |
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| Keywords: | Telescope Array, indirect detection, surface detection, ground array, ultra-high energy, cosmic rays, composition, anisotropy, magnetic fields, 2MRS |
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| Publication status: | Published |
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| Year of publishing: | 2022 |
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| PID: | 20.500.12556/RUNG-8528  |
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| COBISS.SI-ID: | 167012611 |
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| DOI: | 10.22323/1.395.0294 |
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| NUK URN: | URN:SI:UNG:REP:9OMT9ESH |
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| Publication date in RUNG: | 04.10.2023 |
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| Views: | 1913 |
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| Downloads: | 6 |
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