Dark Matter Strikes Back at the Galactic Center - Rebecca Leane, MIT -303 Jadwin

Tue, Feb 19, 2019, 4:00 pm

Abstract: The Galactic Center GeV Excess (GCE) is firmly detected. While there is statistical evidence suggesting the excess originates largely from point sources, its interpretation as a signal of annihilating dark matter has not been conclusively ruled out. In this talk, I will examine the impact of unmodelled source populations on identifying the true origin of the GCE, using non-Poissonian template fitting (NPTF) methods. In a simulated proof-of-principle scenario, I will show that unmodelled sources in the Fermi Bubbles leads to a dark matter signal being misattributed to point sources by the NPTF. Strikingly, we find there is behavior consistent with such an effect in the real Fermi data, as a fake injected dark matter signal is completely misattributed to point sources. This demonstrates that dark matter may be substantially contributing to the GCE, as its presence can be incorrectly discarded due to a yet discovered unmodelled point source population biasing results.

Jadwin 303