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
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: |
|
| 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.