论文标题
宇宙射线传播正在考虑空间分布的源分布
Cosmic-ray propagation under consideration of a spatially resolved source distribution
论文作者
论文摘要
宇宙射线（CRS）是星际介质的组成部分，在与其他银河系组件（如星际气体或磁场）相互作用的同时产生宽带发射。除了观察外，通过星系对Cr传播的数值模拟有助于提高对银河CR传输的理解水平，并扩散了$γ$ -Ray的发射，如不同的实验所见。到目前为止，用于建模用作输入的源分布的标准方法通常依赖于径向对称性和分析功能，而不是基于观察的来源。我们的目标是通过将观察到的源与H.E.S.S.相结合，以重新定义现有的CR源分布。实验和模拟随机来源，以银河系的方式遵循物质密度。结果，推断出了H.E.S.S.启发的银河CR源分布。我们使用PICARD代码在CR传播中使用混合源分布模型在CR传播中执行3D模拟。此外，还在银河系中的不同区域进行了评估，还评估了使用重新定义的源模型模拟的伽马射线图和光谱，并彼此进行比较以确定基本分布的统计散射。我们发现我们的模型和先前的模拟之间的全球一致性，只有一些局部波动，例如在螺旋臂中。基于观察和模拟的三维源模型的实施实现了新的传播建模质量。它为超出径向对称性的更现实的CR传输方案提供了可能性，并在银河系的手臂和手臂区域都能提供有意义的结果。通过包括来自源模型的结构，而不仅仅是气体分布，这给出了银河$γ$ ray天空的更现实图片。
Cosmic rays (CRs) are an integral component of the interstellar medium, producing broadband emission while interacting with other Galactic matter components like the interstellar gas or magnetic fields. In addition to observations, numerical simulations of CR propagation through the Galaxy help to increase the level of understanding of Galactic CR transport and diffuse $γ$-ray emission as seen by different experiments. Up to now, the standard approach at modelling source distributions used as input for such transport simulations often rely on radial symmetry and analytical functions rather than individual, observation-based sources. We aim at a redefinition of existing CR source distributions by combining sources observed with the H.E.S.S. experiment and simulated random sources, which follow the matter density in the Milky Way. As a result, H.E.S.S.-inspired Galactic CR source distributions are inferred. We use the PICARD code to perform 3D-simulations of nuclei and electrons in CR propagation using our hybrid source distribution models. Furthermore, also gamma-ray maps and spectra, simulated with the redefined source models, are evaluated in different regions in the Galaxy and compared with each other to determine the statistical scatter of the underlying distributions. We find global consistency between our models and in comparison to previous simulations, with only some localised fluctuations, e.g. in the spiral arms. This implementation of a three-dimensional source model based on observations and simulations enables a new quality of propagation modelling. It offers possibilities for more realistic CR transport scenarios beyond radial symmetry and delivers meaningful results in both the arm and interarm regions of the Galaxy. This gives a more realistic picture of the Galactic $γ$-ray sky by including structures from the source model and not just the gas distributions.
