Limit on an Isotropic Diffuse Gamma-Ray Population with HAWC

Understand

Data from 105 days from the High Altitude Water Cherenkov Observatory (HAWC) have been used to place a new limit on an isotropic diffuse gamma-ray population above 10 TeV.

• High- energy isotropic diffuse gamma-ray emission is produced by unresolved extragalactic objects such as active galactic nuclei, with potential contributions from interactions of high-energy cosmic rays with the inter-Galactic medium, or dark matter annihilation.
• Isotropic diffuse gamma-ray emission has been observed up to nearly 1 TeV.
• Above this energy, only upper limits have been reported.