Search Publications

An asymmetric distribution of positrons in the Galactic disk revealed by γ-rays

Knödlseder, Jürgen; Winkler, Christoph; Diehl, Roland +8 more

Gamma-ray line radiation at 511keV is the signature of electron-positron annihilation. Such radiation has been known for 30years to come from the general direction of the Galactic Centre, but the origin of the positrons has remained a mystery. Stellar nucleosynthesis, accreting compact objects, and even the annihilation of exotic dark-matter parti…