The Origin of Galactic Cosmic Rays as Revealed by their Composition
Résumé
Galactic cosmic-rays (GCRs) are thought to be accelerated in strong shocks induced by massivestar winds and supernova explosions sweeping across the interstellar medium. But the phase of theinterstellar medium from which the CRs are extracted has remained elusive up to now. We havestudied in detail the GCR source composition deduced from recent measurements by the AMS-02,Voyager 1 and SuperTIGER experiments to obtain information on the composition, ionisationstate and dust content of the GCR source reservoirs. The results of this data analysis suggest thatthe GCRs are mainly accelerated in superbubbles energised by the activity of massive star windsand supernova explosions. The resulting model explains well the measured abundances of allprimary and mostly primary CRs from H to Zr, including the overabundance of22Ne.
Domaines
Planète et Univers [physics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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