Gamma-ray emissivities of local gas agree with directly measured cosmic-ray spectra after correcting for optically thick HI, with a ~10% gradient toward the inner Galaxy and CO-dark H2 dominating small clouds.
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Cosmic-ray and Interstellar Gas Properties in the Solar Neighborhood Revealed by Diffuse Gamma Rays
Gamma-ray emissivities of local gas agree with directly measured cosmic-ray spectra after correcting for optically thick HI, with a ~10% gradient toward the inner Galaxy and CO-dark H2 dominating small clouds.