利用空间依赖传播模型通过宇宙线各向异性约束银河系晕的厚度
Constraining the Thickness of the Galactic Halo through Cosmic-Ray Anisotropy Using the Spatial-Dependent-Propagation Model
AI总结：
本研究首次基于空间依赖传播（SDP）模型联合分析太阳偏移、宇宙线核谱与各向异性，发现内晕厚度需随太阳位移线性增加，且PeV各向异性可打破扩散系数与晕厚度的简并性，为约束晕厚度和太阳偏移提供新方法。
摘要：
带有近源的空间依赖传播（SDP）模型能很好地再现宇宙线（CR）核谱和各向异性的协同演化特征。然而，众所周知，太阳实际上偏离了银盘。这将导致垂直于银盘方向出现主导性各向异性，与当前观测结果不符。因此，有必要进一步研究太阳偏移对各向异性的影响。在本研究中，据我们所知，这是首次基于SDP模型对太阳偏移、核谱和各向异性进行联合研究。结果表明，为了再现CR谱和各向异性，内晕厚度（Z_{IH}）需要随太阳位移线性增加。我们还知道，PeV各向异性可用于估计扩散系数的值，从而打破扩散系数与晕厚度之间的简并性。因此，这是一种约束晕厚度的有效方法。此外，PeV能区的各向异性作为一种新探针，可能也为约束太阳偏移提供新的思路。希望通过LHAASO实验能精确测量从约TeV到PeV能量的各向异性，从而更好地理解厚晕。
英文摘要：
The spatial-dependent-propagation (SDP) model with a nearby source works well to reproduce the coevolving features of both cosmic-ray (CR)-nuclei spectra and anisotropy. However, it is well known that the Sun is actually deviating from the galactic disk. This will lead to a dominating anisotropy in the direction perpendicular to the galactic disk, which is discrepant with current observations. Thus, it is necessary to further investigate the effect of the solar offset on anisotropy. In this work, to the best of our knowledge, this is the first time that the combined studies of the solar offset, nuclei spectra, and anisotropy have been performed based on the SDP model. As a result, to reproduce CR spectra and anisotropy, the thickness of the inner halo $ (Z_{IH})$ needs to increase linearly with the displacement of the Sun. We also know that the PeV anisotropy could be used to estimate the value of the diffusion coefficient, thus breaking the degeneracy between the diffusion coefficient and halo thickness. Therefore, it is a good approach to constrain the halo thickness. Moreover, the anisotropy in the PeV energy region, as a new probe, might also shed new light on constraining the solar offset. It is hoped that the anisotropy of the energies from $\rm \sim$TeV to $\rm PeV$ can be finely measured with the LHAASO experiment, leading to a better understanding of the thick halo.
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