Constraints on diffuse gamma-ray emission from structure formation processes in the Coma cluster

Understand

We analyze 5-year (63 months) data of the Large Area Telescope on board Fermi satellite from the Coma galaxy cluster in the energy range between 100 MeV and 100 GeV.

• The likelihood analyses are performed with several templates motivated by models predicting gamma-ray emission due to structure formation processes.
• We find no excess emission and derive the most stringent constraints to date on the Coma cluster above 100 MeV, and on the tested scenarios in general.
• The upper limits on the integral flux range from 10^-10 to 10^-9 cm^-2s^-1, and are stringent enough to challenge different scenarios.