Small-scale Anisotropies of Cosmic Rays from Turbulent Flow
| Autor: | Yiran Zhang, Siming Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal Letters, Vol 964, Iss 1, p L1 (2024) |
| Druh dokumentu: | article |
| ISSN: | 2041-8213 2041-8205 |
| DOI: | 10.3847/2041-8213/ad2df4 |
| Popis: | 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 _ℓ is then a direct reflection of interstellar turbulence, from which one expects C _ℓ ∝ ℓ ^− ^γ ^−1 for ℓ ≫ 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 ^−1 on the scale of 10 pc. |
| Databáze: | Directory of Open Access Journals |
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