Bright Cosmic-Ray Source as a Solution to Auger-TA Tensions
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914153587802112 |
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| author | Korochkin, Alexander Semikoz, Dmitri Tinyakov, Peter |
| author_facet | Korochkin, Alexander Semikoz, Dmitri Tinyakov, Peter |
| contents | The ultra-high-energy cosmic ray (UHECR) spectra measured by the Pierre Auger Observatory (Auger) and the Telescope Array (TA) agree very well below $10^{19.5}$ eV but differ significantly at higher energies. We show that these differences can be explained by a single nearby source superimposed on a nearly isotropic background. Taking into account deflections in Galactic and extragalactic magnetic fields, such a source can account for the excess in the TA spectrum without producing excessive anisotropy. The required hard spectrum of the source and intermediate-mass composition are consistent with previous fits of the Auger-only spectrum and composition. This scenario offers several additional advantages: (i) the source produces a broad excess partially overlapping the TA hotspots, suggesting their possible explanation; (ii) without additional tuning, it reproduces the $\sim90^\circ$ shift in dipole direction observed between the Auger-only and combined Auger-TA analyses; and (iii) the best-fit position of the source lies near M82, the brightest nearby starburst galaxy, making it a plausible source of the UHECR. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_09406 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bright Cosmic-Ray Source as a Solution to Auger-TA Tensions Korochkin, Alexander Semikoz, Dmitri Tinyakov, Peter High Energy Astrophysical Phenomena The ultra-high-energy cosmic ray (UHECR) spectra measured by the Pierre Auger Observatory (Auger) and the Telescope Array (TA) agree very well below $10^{19.5}$ eV but differ significantly at higher energies. We show that these differences can be explained by a single nearby source superimposed on a nearly isotropic background. Taking into account deflections in Galactic and extragalactic magnetic fields, such a source can account for the excess in the TA spectrum without producing excessive anisotropy. The required hard spectrum of the source and intermediate-mass composition are consistent with previous fits of the Auger-only spectrum and composition. This scenario offers several additional advantages: (i) the source produces a broad excess partially overlapping the TA hotspots, suggesting their possible explanation; (ii) without additional tuning, it reproduces the $\sim90^\circ$ shift in dipole direction observed between the Auger-only and combined Auger-TA analyses; and (iii) the best-fit position of the source lies near M82, the brightest nearby starburst galaxy, making it a plausible source of the UHECR. |
| title | Bright Cosmic-Ray Source as a Solution to Auger-TA Tensions |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2511.09406 |