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| Format: | Preprint |
| Veröffentlicht: |
2023
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| Online-Zugang: | https://arxiv.org/abs/2311.14628 |
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| _version_ | 1866911934311301120 |
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| author | Kuznetsov, Mikhail Yu. |
| author_facet | Kuznetsov, Mikhail Yu. |
| contents | Recently the Telescope Array collaboration reported an observation of cosmic ray event with very high energy 244 EeV ($2.44 \times 10^{20}$ eV). Importantly, the event is hard to correlate with the matter distribution in the local Universe, even after taking into account deflections in magnetic fields. This implies that the event is likely a nucleus with a large charge. An attenuation length of the nucleus of such a high energy in intergalactic space is quite small, therefore its source should be relatively close to our Galaxy. Using these arguments we derive a new upper bound on a distance to the closest ultra-high energy cosmic ray (UHECR) source and a lower bound on the UHECR source number density in general. The distance to the closest source should not exceed 5 Mpc at 95% C.L. and the 95% C.L. lower-bound on the sources number density is $ρ> 1.0 \times 10^{-4}$ Mpc$^{-3}$. The number density of UHECR sources emitting heavy nuclei is constrained for the first time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_14628 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A nearby source of ultra-high energy cosmic rays Kuznetsov, Mikhail Yu. High Energy Astrophysical Phenomena Recently the Telescope Array collaboration reported an observation of cosmic ray event with very high energy 244 EeV ($2.44 \times 10^{20}$ eV). Importantly, the event is hard to correlate with the matter distribution in the local Universe, even after taking into account deflections in magnetic fields. This implies that the event is likely a nucleus with a large charge. An attenuation length of the nucleus of such a high energy in intergalactic space is quite small, therefore its source should be relatively close to our Galaxy. Using these arguments we derive a new upper bound on a distance to the closest ultra-high energy cosmic ray (UHECR) source and a lower bound on the UHECR source number density in general. The distance to the closest source should not exceed 5 Mpc at 95% C.L. and the 95% C.L. lower-bound on the sources number density is $ρ> 1.0 \times 10^{-4}$ Mpc$^{-3}$. The number density of UHECR sources emitting heavy nuclei is constrained for the first time. |
| title | A nearby source of ultra-high energy cosmic rays |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2311.14628 |