Observation of shadowing of the cosmic electrons and positrons by the Moon with IACT

Understand

Recent measurements of the cosmic-ray electron (e-) and positron (e+) fluxes show apparent excesses compared to the spectra expected by standard cosmic-ray (CR) propagation models in our galaxy.

• These excesses may be related to particle acceleration in local astrophysical objects, or to dark matter annihilation/decay.
• The e+/e- ratio (measured up to ~100 GeV) increases unexpectedly above 10 GeV and this may be connected to the excess measured in all-electron flux at 300-800 GeV.
• Measurement of this ratio at higher energies is a key parameter to understand the origin of these spectral anomalies.