Rui-Zhi Yang

Measurement of Cosmic-Ray Density in the Spiral Arms toward Galactic Anticenter

Using nearly 17 yr of Fermi-LAT data, we analyzed the diffuse γ-ray emission associated with different spiral arms of the Milky Way in the ranges l = 105∘–145∘and b = −5∘ to 5∘. The γ-ray emissions from these spiral arms all exhibited clear pion-bump features, which can be well explained by a power-law spectrum of cosm...