Anisotropies in the flux of cosmic ray electrons and positrons

7th Young Researcher Meeting

Manconi, S.^1 ; Di Mauro, M.^2 ; Donato, F.^1

Physics Department, Torino University, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, via Giuria 1, Torino

10125, Italy^1

W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, SLAC National Accelerator Laboratory, Stanford University, Stanford

CA

94305, United States^2

关键词: Astrophysical sources;    Complementary tools;    Cosmic ray electrons;    Cosmic ray flux;    Diffusion model;    Dipole anisotropy;    Production mechanisms;    Supernova remnants;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/841/1/012006/pdf
DOI  :  10.1088/1742-6596/841/1/012006

来源: IOP

【 摘 要 】

High energy cosmic ray electrons and positrons probe the local properties of our galaxy. In fact, regardless of the production mechanism, electromagnetic energy losses limit the typical propagation scale of GeV-TeV electrons and positrons to a few kpc. In the diffusion model, the presence of 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 present cosmic ray electron and positrons fluxes. Predictions for the dipole anisotropy from known astrophysical sources as Supernova Remnants (SNRs) and pulsars taken from the Green and the Australia Telescope National Facility (ATNF) catalogs are shown. The results are obtained from models compatible with the most recent AMS-02 data on electrons and positrons fluxes. In particular, anisotropies for single sources as well as for a distribution of catalog sources are discussed. We compare our results with current anisotropy upper limits from the Fermi-LAT and PAMELA experiments, showing that the search of anisotropy in the electron and positron fluxes represents a complementary tool to inspect the properties of close SNRs, as for example the Vela SNR.