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Detecting ultra-high-energy cosmic ray anisotropies through harmonic cross-correlations

Abstract:
We propose an observable for ultra-high-energy cosmic ray (UHECR) physics: the harmonic-space cross-correlation power spectrum between the arrival directions of UHECRs and the large-scale cosmic structure mapped by galaxies. This cross-correlation has not yet been considered in the literature, and it permits a direct theoretical modelling of the main astrophysical components. We describe the expected form of the cross-correlation and show how, if the distribution of UHECR sources traces the large-scale cosmic structure, it could be easier to detect with current data than the UHECR auto-correlation. Moreover, the cross-correlation is more sensitive to UHECR anisotropies on smaller angular scales, it is more robust to systematic uncertainties, and it could be used to determine the redshift distribution of UHECR sources, making it a valuable tool for determining their origins and properties.
Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1051/0004-6361/202038459

Authors

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Astrophysics
Oxford college:
Christ Church
Role:
Author
ORCID:
0000-0002-4598-9719

More from this funder
Funder identifier:
https://ror.org/057g20z61
Grant:
ST/P004474/2
ST/P004474/1
More from this funder
Funder identifier:
https://ror.org/00k4n6c32

Publisher:
EDP Sciences
Journal:
Astronomy and Astrophysics More from this journal
Volume:
652
Article number:
A41
Publication date:
2021-08-06
Acceptance date:
2021-05-02
DOI:
EISSN:
1432-0746
ISSN:
0004-6361

Language:
English
Keywords:
Pubs id:
2074979
Local pid:
pubs:2074979
Deposit date:
2025-05-07

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