Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 29: Cosmic rays I
T 29.2: Talk
Tuesday, March 31, 2020, 17:15–17:30, H-HS XII
Interstellar electron and positron spectra from MeV to TeV energies — •Andrea Vittino1, Philipp Mertsch1, Henning Gast2, and Stefan Schael2 — 1Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, Germany — 2I. Physics Institute and JARA-FAME, RWTH Aachen University, Germany
Electrons and positrons play a special role among cosmic ray (CR) species. Most strikingly, their strong energy losses in the Galactic magnetic and radiation fields severely limit their propagation distances. Therefore electrons and positrons offer invaluable insights into the local properties of CR acceleration and propagation. In this talk we present our model for their interstellar spectra over a wide energy range extending from the MeV to the TeV domain. We illustrate how the underlying parameters can be efficiently constrained by exploiting different experimental observations, including both direct observations of the spectra (at Earth and at the heliopause) and measurements of the diffuse synchrotron emission generated by CR leptons as they propagate through the magnetic field of the Galaxy. We then consider recent time-dependent observations at GeV energies by AMS and estimate heliospheric modulation in an extension of the force-field model. What emerges is a complex picture of the interstellar electron and positron spectra that must be shaped by a number of transport processes beyond the simplest models.