标题： 宇宙射线对星际介质的电离 显示英文标题

标题： Cosmic ray ionization of the interstellar medium

摘要： 我们考虑一个宇宙射线谱，在动量上是一个幂律，直到一个截止，并从附近弥漫云的观测电离率推导出对应于$E_{kin} \sim (30-60)$ MeV 的下限。 尽管宇宙射线的真实谱可能并不如此简单，但我们认为在这样的能量下预期谱会有显著变化，并且在第一近似下，具有下限的幂律谱是合适的。 这种对星际介质中宇宙射线的描述不仅在理论上比文献中使用的谱更具吸引力，而且也得到了最近观测的支持。 显示英文摘要

摘要： We consider a cosmic ray spectrum that is a power law in momentum down to a cutoff and derive a lower cutoff corresponding to $E_{kin} \sim (30-60)$ MeV from the observed ionization rates in nearby diffuse clouds. While the real spectra of cosmic rays may not be so simple, we argue that one expects a substantial change in the spectra at such energies and that, at first approximation, a power law spectra with a lower cutoff is appropriate. Such a description of the cosmic rays in the interstellar medium is not only theoretically more attractive than the spectra used in the literature, but is also supported by recent observations.