A nearby cosmic-ray source would make the gamma-ray spectral indices of molecular clouds evolve differently with energy, providing a new observational test.
Consequently, GMCs in closer proxim- ity to the nearby source are influenced by its CR flux at lower energies, leading to an earlier harden- ing in their CR spectrum
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Deciphering the spectral bumps of Galactic cosmic rays through gamma-ray observations of nearby molecular clouds
A nearby cosmic-ray source would make the gamma-ray spectral indices of molecular clouds evolve differently with energy, providing a new observational test.