论文标题
在弥漫性星际介质中低能宇宙射线传播的半经验方法
A semiempirical approach to low-energy cosmic ray propagation in the diffuse interstellar medium
论文作者
论文摘要
我们通过使用蒙特卡洛方法对弥散的磁场进行建模，通过宇宙射线对弥散的星际介质进行电离。我们研究湍流中低能的宇宙射线在湍流，半透明的分子云中如何传播，以及它们如何调节电离以及从培养基中损失和获取能量。作为测试案例，我们使用良好的高纬度半透明云MBM 3的高空间分辨率（0.03 PC）图来模拟湍流。通过修改的蒙特卡洛程序解决了传播问题，其中包括捕获，能量和电离损失。在均匀介质中，捕获和重新加工不会产生显着影响。在不均匀的介质中，可以在云中长时间捕获颗粒。这会因最高能量（约100 MEV）处的随机加速度而修饰宇宙射线分布。在较低的能量下，重新启动太弱，无法产生明显的效果。 The change in the energy distribution does not significantly affect the ionization losses, so ionization changes are due to trapping effects.
We investigate the ionization of the diffuse interstellar medium by cosmic rays by modeling their propagation along the wandering magnetic fields using a Monte Carlo method. We study how low-energy cosmic rays propagate in turbulent, translucent molecular clouds, and how they regulate the ionization and both lose and gain energy from the medium. As a test case, we use high spatial resolution (0.03 pc) CO maps of a well-studied high latitude translucent cloud, MBM 3, to model turbulence. The propagation problem is solved with a modified Monte Carlo procedure that includes trapping, energization, and ionization losses. In a homogeneous medium, trapping and re-energization do not produce a significant effect. In a nonuniform medium, particles can be trapped for a long time inside the cloud. This modifies the cosmic ray distribution due to stochastic acceleration at the highest energies (about 100 MeV). At lower energies, the re-energization is too weak to produce an appreciable effect. The change in the energy distribution does not significantly affect the ionization losses, so ionization changes are due to trapping effects.
