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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2108.00611 (astro-ph)
[Submitted on 2 Aug 2021]

Title:The contribution of distant sources to the observed flux of ultra high-energy cosmic rays

Authors:Ellis R. Owen, Qin Han, Kinwah Wu, Y. X. Jane Yap, Pooja Surajbali
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Abstract:Ultra-high-energy (UHE) cosmic rays (CRs) interact with cosmic background radiation through hadronic processes, and the Universe would become `opaque' to UHE CRs of energies $\sim$($10^{18}$- $10^{20}$) eV over about several tens of Mpc, setting the Greisen-Zatsepin-Kuz'min (GZK) horizon. We demonstrate that a non-negligible fraction of the UHE CRs arriving on Earth could originate from beyond the GZK horizon when heavy nuclear CRs, and the population and evolution of UHE CR sources are taken into account. We show how the multi-particle CR horizon is modified by different source populations, and discuss how this leads to the natural emergence of an isotropic flux component in the observed UHE CR background. This component would coexist with an anisotropic foreground component contributed by nearby sources within the GZK horizon.
Comments: Presented at the 37th International Cosmic Ray Conference (ICRC 2021). 8 pages, 3 figures, 2 tables; see also arXiv:2107.12607
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Astrophysics of Galaxies (astro-ph.GA)
Report number: PoS(ICRC2021)446
Cite as: arXiv:2108.00611 [astro-ph.HE]
  (or arXiv:2108.00611v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2108.00611
Related DOI: https://doi.org/10.22323/1.395.0446

Submission history

From: Ellis Owen [view email]
[v1] Mon, 2 Aug 2021 03:06:00 UTC (1,736 KB)
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