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arXiv 1003.2489astro-ph.GAastro-ph.CO
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Milky Way中的模式速度

Pattern speeds in the Milky Way

Ortwin Gerhard

摘要:

简要回顾了用于确定银河棒臂和旋臂的速度图的不同方法。银河棒快速旋转,在银河中心和太阳之间的中途进行共转,在距离太阳轨道R0不远的地方进行林德布拉德共振。银河系的旋臂目前以一种明显较慢的模式速度旋转,这样,共转就在R0之外。因此,这两种结构似乎是动态解耦的。

英文摘要:

A brief review is given of different methods used to determine the pattern speeds of the Galactic bar and spiral arms. The Galactic bar rotates rapidly, with corotation about halfway between the Galactic center and the Sun, and outer Lindblad resonance not far from the solar orbit, R0. The Galactic spiral arms currently rotate with a distinctly slower pattern speed, such that corotation is just outside R0. Both structures therefore seem dynamically decoupled.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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