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arXiv 2209.01412astro-ph.HEphysics.plasm-ph
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Cosmic-Ray对流扩散各向异性

Cosmic-Ray Convection-Diffusion Anisotropy

Yiran Zhang, Siming Liu, Dejin Wu

摘要:

在非均匀对流条件下,由于流体惯性力和剪切力的作用,扩散粒子的分布呈现偶极和四极各向异性。这些对流相关的各向异性,不同的康普顿-Getting效应,通常与宇宙射线(CR)的能量增加,因此是CR各向异性的候选贡献者。考虑到惯性效应,可以利用CR观测数据将赤道面内局部星际介质的平均加速度上限设定为100 $ μ\text{m}/\text{s}^2 $量级。使用奥尔特常数,四极各向异性超过200 TeV可以模拟剪切效应所产生的银河系的差异旋转。

英文摘要:

Under nonuniform convection, the distribution of diffusive particles can exhibit dipole and quadrupole anisotropy induced by the fluid inertial and shear force, respectively. These convection-related anisotropies, unlike the Compton-Getting effect, typically increase with the cosmic-ray (CR) energy, and are thus candidate contributors for the CR anisotropy. In consideration of the inertial effect, CR observational data can be used to set an upper limit on the average acceleration of the local interstellar medium in the equatorial plane to be on the order of 100 $ μ\text{m}/\text{s}^2 $. Using Oort constants, the quadrupole anisotropy above 200 TeV may be modeled with the shear effect arising from the Galactic differential rotation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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