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The Origin of the Most Energetic Galactic Cosmic Rays: Supernova Explosions into Massive Star Plasma Winds
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The Important Role of Cosmic-Ray Re-Acceleration

Istituto Nazionale di Astrofisica-Istitituto di Astrofisica e Planetologia Spaziali, Via del Fosso del Cavaliere 100, 00133 Roma, Italy
Galaxies 2019, 7(2), 49; https://doi.org/10.3390/galaxies7020049
Received: 1 March 2019 / Revised: 11 April 2019 / Accepted: 17 April 2019 / Published: 24 April 2019
(This article belongs to the Special Issue Cosmic Rays around Supernova Remnants)
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Abstract

In the last decades, the improvement of high energy instruments has enabled a deeper understanding of the Cosmic Ray origin issue. In particular, the γ -ray satellites AGILE (Astrorivelatore Gamma ad Immagini LEggero) and Fermi-LAT (Fermi-Large Area Telescope) have strongly contributed to the confirmation of direct involvement of Supernova Remnants in Cosmic Ray energization. Despite several attempts to fit experimental data assuming the presence of freshly accelerated particles, the scientific community is now aware that the role of pre-existing Cosmic Ray re-acceleration cannot be neglected. In this work, we highlight the importance of pre-existing Cosmic Ray re-acceleration in the Galaxy showing its fundamental contribution in middle aged Supernova Remnant shocks and in the forward shock of stellar winds. View Full-Text
Keywords: cosmic-rays; re-acceleration; supernova remnants; stellar wind cosmic-rays; re-acceleration; supernova remnants; stellar wind
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cardillo, M. The Important Role of Cosmic-Ray Re-Acceleration. Galaxies 2019, 7, 49.

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