Beyond the myth of the supernova-remnant origin of cosmic rays

TL;DR

This paper questions the long-held belief that supernova remnants are the primary sources of Galactic cosmic-ray ions, suggesting alternative origins may need exploration due to unresolved mysteries.

Contribution

It challenges the traditional supernova-remnant hypothesis for cosmic-ray origins, proposing that the actual acceleration sites might be different or more complex.

Findings

Supernova remnants may not be the main sources of cosmic-ray ions.

Recent evidence for supernova-related acceleration is inconclusive.

Alternative cosmic-ray acceleration mechanisms should be considered.

Abstract

The origin of Galactic cosmic-ray ions has remained an enigma for almost a century. Although it has generally been thought that they are accelerated in the shock waves associated with powerful supernova explosions-for which there have been recent claims of evidence-the mystery is far from resolved. In fact, we may be on the wrong track altogether in looking for isolated regions of cosmic-ray acceleration.