Origin of the DAMPE 1.4 TeV peak

Recent accurate measurements of cosmic ray electron flux by the Dark Matter Particle Explorer (DAMPE) reveal a sharp peak structure near 1.4 TeV, which is difficult to explain by standard astrophysical processes. In this Letter, we propose a simple model that the enhanced dark matter annihilation via the e⁺e⁻ channel and with the thermal relic annihilation cross-section around the current nearest black hole (A0620-00) can satisfactorily account for the sharp peak structure. The predicted dark matter mass is ∼1.5–3 TeV. Copyright © 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.