Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data

Understand

We present results from {\gamma}-ray observations of the Coma cluster incorporating 6 years of Fermi-LAT data and the newly released {\emph{Pass 8}} event-level analysis.

• Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data.
• Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the {\gamma}-ray flux that is expected from energetic particle interactions in the cluster.
• We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons.