A consistent interpretation of recent CR nuclei and electron spectra

TL;DR

This paper analyzes cosmic ray electron and positron spectra, demonstrating that a single-component model is insufficient and proposing a double-component model with pulsars as sources, which fits observations and aligns with anisotropy constraints.

Contribution

It introduces a double-component model with Kraichnan-like diffusion that better explains recent CRE and positron data than single-component models.

Findings

Single-component models cannot fit all data

Double-component model with pulsars fits observations

Predicted anisotropy is consistent with Fermi-LAT constraints

Abstract

We try to interpret the recently updated measurement of the cosmic ray electron (CRE) spectrum observed by Fermi-LAT, together with PAMELA data on positron fraction, in a single-component scenario adopting different propagation setups; we find that the model is not adequate to reproduce the two datasets, so the evidence of an extra primary component of electrons and positrons is strengthened. Instead, a double component scenario computed in a Kraichnan-like diffusion setup (which is suggested by B/C and $\bar{p}$ data) gives a satisfactory fit of all exisiting measurements. We confirm that nearby pulsars are good source candidates for the required $e^\pm$ extra-component and we show that the predicted CRE anisotropy in our scenario is compatible with Fermi-LAT recently published constraints.