Closing in on the Fermi Line with a New Observation Strategy

Understand

Evidence for a spectral line in the inner Galaxy has caused a great deal of excitement over the last year, mainly because of its interpretation as a possible dark matter signal.

• The observation has raised important questions about statistics and suspicions about systematics, especially in photons from the Earth limb.
• With enough additional data, we can address these concerns.
• In this white paper, we summarize the current observational situation and project future sensitivities, finding that the status quo is dangerously close to leaving the issue unresolved until 2015.