Filamentary Diffusion of Cosmic Rays on Small Scales

Details Filamentary Diffusion of Cosmic Rays on Small Scales Filamentary Diffusion of Cosmic Rays on Small Scales

2012-04-05

arxiv.org/abs/1204.1271v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages (2 columns), 4 figures

Scientific paper

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 \simeq 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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