The interstellar environment in the outer Galaxy as seen in gamma rays by Fermi

  title={The interstellar environment in the outer Galaxy as seen in gamma rays by Fermi},
  author={Luigi Tibaldo and Isabelle A. Grenier and Tsunefumi Mizuno and for the Star Collaboration},
  journal={arXiv: High Energy Astrophysical Phenomena},
Gamma-ray emission produced by interactions between cosmic rays (CRs) and interstellar gas traces the product of their densities throughout the Milky Way. The outer Galaxy is a privileged target of investigation to separate interstellar structures seen along the line of sight. Recent observations by the Fermi Large Area Telescope (LAT) shed light on open questions of the EGRET era about the distribution of CR densities and the census of the interstellar medium. The gradient of gamma-ray… Expand

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