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# ICRC2015

July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

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

Aug 4, 2015, 4:00 PM
1h
Amazon Foyer (World Forum)

### Amazon Foyer

#### World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 200
Poster contribution CR-TH

### Speaker

Olivier Deligny (CNRS/IN2P3)

### Description

Recent KASCADE-Grande and Auger results between $10^{17}~$eV and $5~10^{18}~$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 $10^{17}~$eV, and by light and intermediate-nuclei elements above $10^{18}~$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 $10^{17}~$eV, appears dominant together with the extragalactic one once the standard Galactic component is extinguished above few $10^{17}~$eV, and is responsible for the ankle feature through its rapid suppression above $10^{18}~$eV. Possible signatures left in the large-scale structure of arrival directions are discussed.
Collaboration -- not specified -- 607

### Primary authors

Olivier Deligny (CNRS/IN2P3)

### Presentation materials

There are no materials yet.