| Title: | Update on the searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array |
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| Authors: | ID Caccianiga, Lorenzo (Author)
ID Filipčič, Andrej (Author)
ID Lundquist, Jon Paul (Author)
ID Shivashankara, Shima Ujjani (Author)
ID Stanič, Samo (Author)
ID Vorobiov, Serguei (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author), et al. |
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| Files: |  ICRC2023_521.pdf (4,36 MB)
MD5: 57A6BAAA10E77F755F1F4FA4BE4B8AC9
 https://pos.sissa.it/444/
https://pos.sissa.it/444/521/pdf
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| Language: | English |
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| Work type: | Unknown |
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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: | The origin of ultra-high-energy cosmic rays (UHECRs), particles from outer space with energies �≥1 EeV, is still unknown, though the near-isotropy of their arrival direction distribution excludes a dominant Galactic contribution, and interactions with background photons prevent them from travelling cosmologically large distances. This suggests that their sources must be searched for in nearby galaxy groups and clusters. Deflections by intergalactic and Galactic magnetic fields are expected to hinder such searches but not preclude them altogether. So far, the only anisotropy detected with statistical significance ≥ 5� is a modulation in right ascension in the data from the Pierre Auger Observatory at �≥8 EeV interpretable as a 7% dipole moment. Various hints for higher-energy, smaller-scale anisotropies have been reported. UHECR arrival direction data from both the Pierre Auger Observatory and the Telescope Array experiment have been searched for anisotropies by a working group with members from both collaborations; combining the two datasets requires a cross-calibration procedure due to the different systematic uncertainties on energy measurements but allows us to perform analyses that are less model-dependent than what can be done with partial sky coverage. We report a significant dipole pointing away from the Galactic Center and a ∼4.6� anisotropy found when comparing the directions of UHECRs with a catalog of starburst galaxies. |
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| Keywords: | Pierre Auger Observatory, ultra-high energy cosmic rays, anisotropy, galactic magnetic fields, telescope array, arrival directions |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.01.2023 |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-15 |
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| PID: | 20.500.12556/RUNG-8809  |
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| COBISS.SI-ID: | 182201859 |
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| UDC: | 52 |
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| ISSN on article: | 1824-8039 |
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| DOI: | 10.22323/1.444.0521 |
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| NUK URN: | URN:SI:UNG:REP:OD8FCLYJ |
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| Publication date in RUNG: | 23.01.2024 |
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| Views: | 375 |
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| Downloads: | 4 |
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