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arXiv 0907.1899astro-ph.GA
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银河系圆盘的起源和结构

Origin and structure of the Galactic disc(s)

Ralph Schoenrich, James Binney

摘要:

我们研究的化学和动力学结构在太阳附近的一个模型银河系的化学演化的模拟中存在的恒星和气体的径向混合的终点。虽然模拟的恒星形成率从其独特的峰值单调下降,并且没有合并或潮汐事件发生,但该模型复制了厚盘的所有已知属性,以及匹配当地恒星星族的特殊特征,例如具有高旋转速度的薄盘的金属贫乏延伸。我们划分的光盘化学和相关的解剖观察更方便的运动学选择标准。我们的结论是,所观察到的化学银河系盘并没有提供令人信服的证据,暴力起源的厚盘,已被广泛声称。

英文摘要:

We examine the chemical and dynamical structure in the solar neighbourhood of a model Galaxy that is the endpoint of a simulation of the chemical evolution of the Milky Way in the presence of radial mixing of stars and gas. Although the simulation's star-formation rate declines monotonically from its unique peak and no merger or tidal event ever takes place, the model replicates all known properties of a thick disc, as well as matching special features of the local stellar population such as a metal-poor extension of the thin disc that has high rotational velocity. We divide the disc by chemistry and relate this dissection to observationally more convenient kinematic selection criteria. We conclude that the observed chemistry of the Galactic disc does not provide convincing evidence for a violent origin of the thick disc, as has been widely claimed.

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