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| HAL : hal-00713437, version 1 |
| arXiv : 1112.5599 |
| Code Bibliographique ADS : 2012JCAP...07..031G |
| DOI : 10.1088/1475-7516/2012/07/031 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Cosmology and Astroparticle Physics 07 (2012) 031 |
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| Cosmic Ray Anisotropy as Signature for the Transition from Galactic to Extragalactic Cosmic Rays |
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| G. Giacinti 1, 2, 3M. Kachelriess 2 |
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| (07/2012) |
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| We constrain the energy at which the transition from Galactic to extragalactic cosmic rays occurs by computing the anisotropy at Earth of cosmic rays emitted by Galactic sources. Since the diffusion approximation starts to loose its validity for E/Z >~ 10^(16-17) eV, we propagate individual cosmic rays using Galactic magnetic field models and taking into account both their regular and turbulent components. The turbulent field is generated on a nested grid which allows spatial resolution down to fractions of a parsec. If the primary composition is mostly light or intermediate around E ~ 10^18 eV, the transition at the ankle is ruled out, except in the unlikely case of an extreme Galactic magnetic field with strength >~ 10 {\mu}G. Therefore, the fast rising proton contribution suggested by KASCADE-Grande data between 10^17 eV and 10^18 eV should be of extragalactic origin. In case heavy nuclei dominate the flux at E >~ 10^18 eV, the transition energy can be close to the ankle, if Galactic cosmic rays are produced by sufficiently frequent transients as e.g. magnetars. |
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| 1 : | AstroParticule et Cosmologie (APC) |
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CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU |
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| 2 : | Institutt for fysikk, NTNU (NTNU) |
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Trondheim |
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| 3 : | Institut für Theoretische Physik (ITP) |
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Universität Hamburg |
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| APC - THEORIE |
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| Domaine | : | Physique/Astrophysique/Phénomènes cosmiques de haute energie Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie |
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| Lien vers le texte intégral : |
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| http://fr.arXiv.org/abs/1112.5599 |
| hal-00713437, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00713437 | |
| oai:hal.archives-ouvertes.fr:hal-00713437 | |
| Contributeur : Dmitri Semikoz | |
| Soumis le : Dimanche 1 Juillet 2012, 13:42:08 | |
| Dernière modification le : Jeudi 23 Août 2012, 12:51:45 | |
