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arXiv 1811.02419astro-ph.HE
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各向异性扩散和cosmic ray各向异性

Anisotropic diffusion and the cosmic ray anisotropy

M. Kachelriess

摘要:

我们认为宇宙射线在银河系磁场中的扩散必须是强各向异性的。结果,对局部CR通量有贡献的CR源的数量减少了因子$\sim 200$。因此,CR密度不太平滑,并且各个源对CR偶极各向异性的贡献变得更加突出。在各向异性扩散的情况下,在CR偶极各向异性约2-20 TeV的观察到的高原,可以解释由2-3百万年的CR源,占主导地位的本地CR通量在这个能量范围内。

英文摘要:

We argue that the diffusion of cosmic rays in the Galactic magnetic field has to be strongly anisotropic. As a result, the number of CR sources contributing to the local CR flux is reduced by a factor $\sim 200$. The CR density is therefore less smooth, and the contribution of individual sources to the CR dipole anisotropy becomes more prominent. In the case of anisotropic diffusion, the observed plateau in the CR dipole anisotropy around 2-20 TeV can be explained by a 2-3 Myr old CR source which dominates the local CR flux in this energy range.

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