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

Ellis R. Owen; Qin Han; Kinwah Wu; Y. X. Jane Yap; Pooja Surajbali

doi:10.22323/1.395.0446

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

Ellis R. Owen, Qin Han, Kinwah Wu, Y. X. Jane Yap, Pooja Surajbali

Research output: Contribution to journal › Conference paper › peer-review

24 Downloads (Pure)

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 ∼(10¹⁸-10²⁰) 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.

Original language	English
Article number	446
Pages (from-to)	1-8
Number of pages	8
Journal	Proceedings of Science
Volume	395
DOIs	https://doi.org/10.22323/1.395.0446
Publication status	Published - 18 Mar 2022
Event	37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Germany Duration: 12 Jul 2021 → 23 Jul 2021

Bibliographical note

© Copyright owned by the author(s). Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Access to Document

10.22323/1.395.0446Licence: CC BY-NC-ND

Publisher version (open access)Final published version, 1.19 MBLicence: CC BY-NC-ND

Cite this

@article{a8beca99f8f54c458b69e1d768ff307f,

title = "The contribution of distant sources to the observed flux of ultra high-energy cosmic rays",

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 ∼(1018-1020) 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.",

author = "Owen, {Ellis R.} and Qin Han and Kinwah Wu and Yap, {Y. X. Jane} and Pooja Surajbali",

note = "{\textcopyright} Copyright owned by the author(s). Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.; 37th International Cosmic Ray Conference, ICRC 2021 ; Conference date: 12-07-2021 Through 23-07-2021",

year = "2022",

month = mar,

day = "18",

doi = "10.22323/1.395.0446",

language = "English",

volume = "395",

pages = "1--8",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - The contribution of distant sources to the observed flux of ultra high-energy cosmic rays

AU - Owen, Ellis R.

AU - Han, Qin

AU - Wu, Kinwah

AU - Yap, Y. X. Jane

AU - Surajbali, Pooja

N1 - © Copyright owned by the author(s). Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2022/3/18

Y1 - 2022/3/18

N2 - 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 ∼(1018-1020) 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.

AB - 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 ∼(1018-1020) 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.

UR - http://www.scopus.com/inward/record.url?scp=85143885078&partnerID=8YFLogxK

U2 - 10.22323/1.395.0446

DO - 10.22323/1.395.0446

M3 - Conference paper

AN - SCOPUS:85143885078

SN - 1824-8039

VL - 395

SP - 1

EP - 8

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 446

T2 - 37th International Cosmic Ray Conference, ICRC 2021

Y2 - 12 July 2021 through 23 July 2021

ER -

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

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this