Galactic positrons and electrons from dark matter and astrophysical sources

TL;DR

This paper examines the origins of galactic positrons and electrons, analyzing their propagation and production from dark matter, astrophysical sources, and secondary processes using a two-zone model.

Contribution

It compares different sources of cosmic ray electrons and positrons within a unified propagation framework, highlighting uncertainties in their origins.

Findings

Propagation uncertainties are quantified for different source scenarios.

Dark matter annihilation can account for observed positron excess.

Supernova remnants contribute significantly to electron flux.

Abstract

The electron and positron cosmic rays observations have impulsed a hot debate regarding the origin of such particles. Their propagation in the galactic medium is modeled according to a successfully tested two--zone propagation model. The theoretical uncertainties related to their propagation and production are studied for three cases: secondary production, Dark Matter annihilation, and originating from supernovae remnants.