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| HAL : hal-00713444, version 1 |
| arXiv : 1204.1271 |
| DOI : 10.1103/PhysRevLett.108.261101 |
| Fiche détaillée |  Récupérer au format |
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| Physical Review Letters 108 (2012) 261101 |
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| Filamentary Diffusion of Cosmic Rays on Small Scales |
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| G. Giacinti 1M. Kachelriess 2 |
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| (2012) |
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| We investigate the diffusion of cosmic rays (CR) close to their sources. Propagating individual CRs in purely isotropic turbulent magnetic fields with maximal scale of spatial variations Lmax, we find that CRs diffuse anisotropically at distances r <~ Lmax from their sources. As a result, the CR densities around the sources are strongly irregular and show filamentary structures. We determine the transition time t* to standard diffusion as t* ~ 10^4 yr (Lmax/150 pc)^b (E/PeV)^(-g) (Brms/4 muG)^g, with b ~ 2 and g = 0.25-0.5 for a turbulent field with Kolmogorov power spectrum. We calculate the photon emission due to CR interactions with gas and the resulting irregular source images. |
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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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| 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/1204.1271 |
| hal-00713444, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00713444 | |
| oai:hal.archives-ouvertes.fr:hal-00713444 | |
| Contributeur : Dmitri Semikoz | |
| Soumis le : Dimanche 1 Juillet 2012, 14:04:57 | |
| Dernière modification le : Dimanche 1 Juillet 2012, 23:18:53 | |
