标题： 宇宙射线在超新星遗迹附近高度可压缩湍流中的镜像扩散 显示英文标题

标题： Mirror diffusion of cosmic rays in highly compressible turbulence near supernova remnants

摘要： 最近的伽马射线观测揭示了宇宙射线（CRs）在星际介质（ISM）中的不均匀扩散。 这是预期的，因为CRs的扩散取决于湍流的特性，而这些特性在多相ISM中可以有很大差异。 我们关注的是在超新星遗迹（SNRs）周围的分子云（MCs）中高度可压缩湍流引起的镜面扩散，其中磁镜效应导致CRs在CR源附近显著抑制扩散。 由于缓慢扩散导致质子-质子相互作用的显著能量损失，使低能CR谱变平，而高能CR谱则由于镜面扩散对CR能量的强依赖性而变陡。 CRs的最终分段幂律谱与从SNR/MC系统（例如IC443和W44）观测到的伽马射线谱相符。 显示英文摘要

摘要： Recent gamma-ray observations reveal inhomogeneous diffusion of cosmic rays (CRs) in the interstellar medium (ISM). This is expected as the diffusion of CRs depends on the properties of turbulence, which can vary widely in the multi-phase ISM. We focus on the mirror diffusion arising in highly compressible turbulence in molecular clouds (MCs) around supernova remnants (SNRs), where the magnetic mirroring effect results in significant suppression of diffusion of CRs near CR sources. Significant energy loss via proton-proton interactions due to slow diffusion flattens the low-energy CR spectrum, while the high-energy CR spectrum is steepened due to the strong dependence of mirror diffusion on CR energy. The resulting broken power law spectrum of CRs matches well the gamma-ray spectrum observed from SNR/MC systems, e.g., IC443 and W44.