SciPost Submission Page
Effect of the Magnetic Horizon on the Combined Fit of the Pierre Auger Observatory Spectrum and Composition Data
by Juan Manuel Gonzalez on behalf of The Pierre Auger Collaboration
This is not the latest submitted version.
Submission summary
| Authors (as registered SciPost users): | Juan Manuel González |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202410_00011v1 (pdf) |
| Date submitted: | 2024-10-08 23:24 |
| Submitted by: | González, Juan Manuel |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 22nd International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2024) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Experimental, Computational, Phenomenological |
Abstract
We interpret the Pierre Auger Observatory's measurement of the energy spectrum and mass composition of cosmic rays with energies above $10^{17.8}$ eV as coming from two extragalactic source populations, one dominating the flux below a few EeV and the other above. Fitting the data neglecting magnetic fields, we find that the high-energy population is required to have a very hard injection spectrum, incompatible with the expectations from diffusive shock acceleration ($E^{-2}$). Turbulent magnetic fields between us and the closest sources can suppress the flux of low-rigidity particles, modifying the cosmic-ray spectrum at Earth. We include the effect of magnetic fields in the fit to the Auger data, which results in softer high-energy injection spectra.
Author indications on fulfilling journal expectations
- Detail work presented at the event covered by the Proceedings Issue
- Meet the specific criteria fixed by the guest Editors.
Current status:
Reports on this Submission
Strengths
The article is well written and the argument is well reasoned.
Weaknesses
No major weaknesses. I only have two minor technical comments regading formatting and missing references.
Report
The authors consider the effect of the turbulent EGMF in suppressing the flux of low-rigidity particles as a mechanism to modify the cosmic-ray spectrum at Earth to fit the energy spectrum and Xmax distributions of data from the Auger Observatory. The article is well written and the argument is well reasoned. I only have two minor technical comments.
Requested changes
1. Line 40: A reference to TALYS is missing.
2. Figure 1: The labels and subfigures are too small and ilegible. I understand that there are space constraints but I would recommend that other formatting adjustments be made to accommodate a larger figure.
Recommendation
Publish (easily meets expectations and criteria for this Journal; among top 50%)