Journal
ASTRONOMY & ASTROPHYSICS
Volume 652, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202038459
Keywords
astroparticle physics; large-scale structure of Universe
Categories
Funding
- European Regional Development Fund (ESIF/ERDF) [CoGraDS - CZ.02.1.01/0.0/0.0/15_003/0000437]
- Czech Ministry of Education, Youth and Sports (MEYS) [CoGraDS - CZ.02.1.01/0.0/0.0/15_003/0000437]
- Italian Ministry of Education, University and Research (MIUR) [L. 232/2016]
- Beecroft Trust
- Science and Technology Facilities Council through an Ernest Rutherford Fellowship [ST/P004474/1]
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A new observable for ultra-high-energy cosmic ray physics is proposed, using the cross-correlation power spectrum. This method allows for direct theoretical modeling of main astrophysical components and is more sensitive to UHECR anisotropies on smaller angular scales.
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.
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