Indirect evidence of GeV dark matter

Abstract

Abstract Recently, an excess of GeV gamma-ray near the Galactic Centre has been reported. The spectrum obtained can be best fitted with the annihilation of 30–40 GeV dark matter particles through $b \bar{b}$ channel. In this Letter, I show that this annihilation model can also solve the mysteries of heating source in X-ray plasma and the unexpected high gamma-ray luminosity. The cross-section constrained by these observations give excellent agreements with both the predicted range by using Fermi-Large Area Telescope (LAT) data and the canonical thermal relic abundance cross-section.