An Additional Component Blurring the Transition between Galactic and Extragalactic Cosmic Rays?

Abstract : Recent KASCADE-Grande and Auger results between 1017 eV and 5 1018 eV have revealed complex features in the energy spectrum, be it in the all-particle one or in the composition-sensitive ones. They have also revealed that the mass composition is dominated by iron nuclei around 1017 eV, and by light and intermediate-nuclei elements above 1018 eV. In this contribution, we argue that these results can be interpreted in a coherent way as the manifestation of an additional component of a different origin from the one responsible for the bulk of Galactic cosmic rays. This component, sub-dominant below 1017 eV, appears dominant together with the extragalactic one once the standard Galactic component is extinguished above few 1017 eV, and is responsible for the ankle feature through its rapid suppression above 1018 eV. Possible signatures left in the large-scale structure of arrival directions are discussed.
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Communication dans un congrès
34th International Cosmic Ray Conference (ICRC 2015), Jul 2015, La Haye, Netherlands. 2015
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http://hal.in2p3.fr/in2p3-01285722
Contributeur : Sophie Heurteau <>
Soumis le : mercredi 9 mars 2016 - 16:31:09
Dernière modification le : jeudi 11 janvier 2018 - 06:12:41

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  • HAL Id : in2p3-01285722, version 1

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O. Deligny. An Additional Component Blurring the Transition between Galactic and Extragalactic Cosmic Rays? . 34th International Cosmic Ray Conference (ICRC 2015), Jul 2015, La Haye, Netherlands. 2015. 〈in2p3-01285722〉

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