Black hole army behind gamma ray excess

摘要

A FLOOD of gamma rays comes at us from the centre of the Milky Way, and dark matter smashing up at the edge of black holes may be partly to blame. Annihilation of weakly interacting massive particles (WIMPs), a leading contender for dark matter, can explain the overall shape of the gamma ray emissions we see. But spikes in the signal must be from other sources, possibly black holes or pulsars.