Sparse local Galactic magnetic field measurements can backtrack 10^20 eV cosmic rays to M82 when the field is near 1 µG, but not when the field is ten times stronger.
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Feasibility of ultra-high-energy cosmic ray backtracking through sparse local measurements of the Galactic magnetic field
Sparse local Galactic magnetic field measurements can backtrack 10^20 eV cosmic rays to M82 when the field is near 1 µG, but not when the field is ten times stronger.