Constraints on Large-Scale Magnetic Fields from the Auger Results

TL;DR

This paper uses cosmic ray directional data from the Pierre Auger Observatory to constrain the strength of large-scale extragalactic magnetic fields, finding values between 0.3 and 0.9 nanogauss.

Contribution

It provides new observational constraints on large-scale magnetic fields by analyzing cosmic ray arrival directions and their correlation with potential extragalactic sources.

Findings

Magnetic field strength constrained between 0.3 and 0.9 nG.

Assumed coherence length between 1 Mpc and 10 Mpc.

Results inform models of cosmic magnetic field distribution.

Abstract

A recent article from the Pierre Auger Collaboration links the direction of charged cosmic rays to possible extragalactic sites of emission. The correlation of the direction of such particles with the direction of the emitter allows constraining the value of large-scale magnetic fields B. Assuming for B a coherence length in the range between 1 Mpc and 10 Mpc, we find values of B between 0.3 and 0.9 nG.