棒星系和环状星系中的Cosmic ray驱动发电机
Cosmic ray driven dynamo in barred and ringed galaxies
摘要：
本文研究了在势的非轴对称分量（即棒和/或椭圆扰动）存在下棒星系和环星系的磁场和星际介质（ISM）的全局演化。磁流体动力发电机是由宇宙射线（CR）驱动的，这些宇宙射线由超新星（SN）遗迹持续提供给磁盘。此外，弱，偶极和随机取向的磁场注入星系盘在SN爆炸。为了将我们的结果与观测到的星系特性直接进行比较，我们构建了高频偏振射电辐射的真实地图。主要结果是，在棒星系和环状星系中，CR驱动发电机可以在几个Gyr内将弱磁场放大到几个$μ$ G。更重要的是，模拟的磁场配置类似于在棒星系和环状星系中观察到的偏振强度图。
英文摘要：
We study the global evolution of the magnetic field and interstellar medium (ISM) of the barred and ringed galaxies in the presence of non-axisymmetric components of the potential, i.e. the bar and/or the oval perturbations. The magnetohydrodynamical dynamo is driven by cosmic rays (CR), which are continuously supplied to the disk by supernova (SN) remnants. Additionally, weak, dipolar and randomly oriented magnetic field is injected to the galactic disk during SN explosions. To compare our results directly with the observed properties of galaxies we construct realistic maps of high-frequency polarized radio emission. The main result is that CR driven dynamo can amplify weak magnetic fields up to few $μ$G within few Gyr in barred and ringed galaxies. What is more, the modelled magnetic field configuration resembles maps of the polarized intensity observed in barred and ringed galaxies.
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