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arXiv 1101.1202astro-ph.GAastro-ph.CO
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径向迁移对恒星星族研究的意义

Implications of Radial Migration for Stellar Population Studies

R. Roškar, V. P. Debattista, S. R. Loebman, Ž. Ivezić, T. R. Quinn

摘要:

最近的理论工作表明,螺旋星系盘中的恒星可能会在盘中径向迁移很长一段距离。这种迁移是螺旋臂共振散射的结果,并在保持轨道圆度的同时移动恒星的引导中心。因此,迁移可以有效地混合银河系盘所有部分的恒星。我们正在迅速接近理论和观测的重要汇合点,在那里我们可能很快就能在我们自己的银河系中发现这种过程的特征。模拟中物理模型的分辨率和鲁棒性已经大大提高,而观测数据集的深度和天体测量精度也在增加。在这里,我们讨论的结果,从我们理想化的N-体/SPH模拟磁盘的形成和演化,特别强调恒星迁移对太阳附近的观测结果和磁盘的垂直结构。我们证明,径向混合的恒星是一个至关重要的动力学过程,我们必须尝试了解,如果我们要得出重要的结论,我们的银河系的历史,从我们附近的恒星的属性。

英文摘要:

Recent theoretical work suggests that it may be common for stars in the disks of spiral galaxies to migrate radially across significant distances in the disk. Such migrations are a result of resonant scattering with spiral arms and move the guiding centers of the stars while preserving the circularities of their orbits. Migration can therefore efficiently mix stars in all parts of the Galactic disk. We are rapidly approaching an important confluence of theory and observation, where we may soon be able to uncover signatures of such processes in our own Milky Way. The resolution and robustness of the physical modeling in simulations has improved drastically, while observational datasets are increasing in depth and astrometric accuracy. Here, we discuss the results from our idealized N-body/SPH simulations of disk formation and evolution, emphasizing specifically the observational consequences of stellar migration on the solar neighborhood and the vertical structure of the disk. We demonstrate that radial mixing of stars is a crucial dynamical process that we must try to understand if we are to draw significant conclusions about our Galactic history from the properties of stars in our vicinity.

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