Anisotropies in GeV-TeV cosmic ray electrons and positrons

TL;DR

This paper investigates how nearby astrophysical sources influence the anisotropies in high-energy cosmic ray electrons and positrons, comparing predictions with current observational limits to better understand their origins.

Contribution

It provides detailed predictions of anisotropies from known sources and compares them with observational data, enhancing interpretation of cosmic ray flux measurements.

Findings

Predicted anisotropies from known sources are consistent with current upper limits.

Nearby sources can produce detectable dipole anisotropies in GeV-TeV electrons and positrons.

Results help constrain the contribution of specific sources to cosmic ray fluxes.

Abstract

High energy cosmic ray electrons and positrons probe the local properties of our Galaxy. In fact, electromagnetic energy losses limit the typical propagation scale of GeV-TeV electrons and positrons to a few kpc. In the diffusion model, nearby and dominant sources may produce an observable dipole anisotropy in the cosmic ray fluxes. We present a detailed study on the role of anisotropies from nearby sources in the interpretation of the observed GeV-TeV cosmic ray electron and positrons fluxes. We compute predictions for the anisotropies from known astrophysical sources as supernova remnants and pulsar wind nebulae of the ATNF catalog. Our results are compared with current anisotropy upper limits from the Fermi- LAT, AMS-02 and PAMELA experiments.