标题： 棒旋星系中的扩散 显示英文标题

标题： Diffusion in barred-spiral galaxies

摘要： 我们通过计算棒盘N体自洽系统中径向迁移的扩散系数和扩散时间尺度，来表征星系盘平面内恒星的径向迁移。该系统具有临界稳定的状态的Toomre-Q参数。 我们发现扩散不是随时间恒定的，而是随着棒的演化而变化，并在近共振区和外盘区域达到最大值，在这些区域中发展出不对称模式。 显示英文摘要

摘要： We characterize the radial migration of stars in the disk plane by calculating the diffusion coefficient and the diffusion time-scale for a bulge-disk N-body self-consistent system with a marginally-stable Toomre-Q parameter. We find that diffusion is not constant in time, but follows the evolution of the bar, and becomes maximum near the corotation region and in the external disk region, where asymmetric patterns develop.