Small-Scale Anisotropies of Cosmic Rays from Turbulent Flow
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Acceso en línea: | |
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| _version_ | 1866909120265715712 |
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| author | Zhang, Yiran Liu, Siming |
| author_facet | Zhang, Yiran Liu, Siming |
| contents | Within the classical convection--diffusion approximation, we show that the angular distribution of cosmic rays (CRs) in a highly turbulent flow may exhibit significant small-scale anisotropies. The CR intensity angular power spectrum $ C_\ell $ is then a direct reflection of interstellar turbulence, from which one expects $ C_\ell\propto\ell^{-γ-1} $ for $ \ell\gg 1 $, where $ γ$ is the power-law turbulence spectral index. Observations by IceCube and HAWC at TeV energies can be explained approximately with the Kolmogorov law $ γ=5/3 $ with a convection velocity dispersion of 20 km/s on the scale of 10 pc. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16554 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Small-Scale Anisotropies of Cosmic Rays from Turbulent Flow Zhang, Yiran Liu, Siming High Energy Astrophysical Phenomena Within the classical convection--diffusion approximation, we show that the angular distribution of cosmic rays (CRs) in a highly turbulent flow may exhibit significant small-scale anisotropies. The CR intensity angular power spectrum $ C_\ell $ is then a direct reflection of interstellar turbulence, from which one expects $ C_\ell\propto\ell^{-γ-1} $ for $ \ell\gg 1 $, where $ γ$ is the power-law turbulence spectral index. Observations by IceCube and HAWC at TeV energies can be explained approximately with the Kolmogorov law $ γ=5/3 $ with a convection velocity dispersion of 20 km/s on the scale of 10 pc. |
| title | Small-Scale Anisotropies of Cosmic Rays from Turbulent Flow |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2402.16554 |