分子云中宇宙射线的自调制：射电观测中的印记
Self-modulation of cosmic rays in molecular clouds: Imprints in the radio observations
摘要：
我们分析了中央分子带（CMZ）和单个分子云的非热射电辐射的性质，并认为所观察到的特征可以在我们最近的宇宙射线（CR）穿透致密分子区域的自调制理论框架内解释。对于气柱密度为$\sim10^{23}$ cm $^{-2}$的云，该理论预测了亚GeV CR电子的耗尽，由于CR质子的自调制而发生，并导致在亚GHz范围内的更硬的同步加速器光谱。同步加速器光谱中电子耗尽的预测印记与CMZ现有射电观测中看到的光谱硬化一致。一个类似的，但甚至更强的同步辐射的影响预测为个人（密度）CMZ云，如Sgr B2。然而，在$\sim$ GHz以上的频率下，观测数据可用，完全由热分量主导，因此需要在较低频率下进行新的观测来验证预测。
英文摘要：
We analyze properties of non-thermal radio emission from the Central Molecular Zone (CMZ) and individual molecular clouds, and argue that the observed features can be interpreted in the framework of our recent theory of self-modulation of cosmic rays (CRs) penetrating dense molecular regions. For clouds with gas column densities of $\sim10^{23}$ cm$^{-2}$, the theory predicts depletion of sub-GeV CR electrons, occurring due to self-modulation of CR protons and leading to harder synchrotron spectra in the sub-GHz range. The predicted imprints of electron depletion in the synchrotron spectra agree well with the spectral hardening seen in available radio observations of the CMZ. A similar, but even stronger effect on the synchrotron emission is predicted for individual (denser) CMZ clouds, such as the Sgr B2. However, the emission at frequencies above $\sim$ GHz, where observational data are available, is completely dominated by the thermal component, and therefore new observations at lower frequencies are needed to verify the predictions.
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。
