arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.5144astro-ph.GAastro-ph.COastro-ph.SR
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Milky Way星系的化学动力学模拟

Chemodynamical Simulations of the Milky Way Galaxy

Chiaki Kobayashi, Naohito Nakasato

摘要:

我们提出了一个银河系型星系的化学动力学模拟,使用自洽的流体动力学代码,包括超新星反馈和化学富集,并预测元素的空间分布从氧到锌。在模拟的星系中,星系球、盘和晕的运动学和化学性质与观测结果一致。隆起是由z>3的亚星系集合体形成的,并且由于Ia型超新星的贡献很小,因此具有更高的[alpha/Fe]比。在13 Gyr以上,盘的恒星形成是恒定的,并且显示出[α/Fe]的下降趋势和[(Na,Al,Cu,Mn)/Fe]相对于[Fe/H]的增加趋势。然而,厚盘星往往比薄盘星具有更高的[alpha/Fe]和更低的[Mn/Fe]。我们还预测了元素丰度比的频率分布作为时间和位置的函数,这可以直接与银河系考古项目,如HERMES进行比较。

英文摘要:

We present chemodynamical simulations of a Milky Way-type galaxy using a self-consistent hydrodynamical code that includes supernova feedback and chemical enrichment, and predict the spatial distribution of elements from Oxygen to Zinc. In the simulated galaxy, the kinematical and chemical properties of the bulge, disk, and halo are consistent with the observations. The bulge formed from the assembly of subgalaxies at z>3, and has higher [alpha/Fe] ratios because of the small contribution from Type Ia Supernovae. The disk formed with a constant star formation over 13 Gyr, and shows a decreasing trend of [alpha/Fe] and increasing trends of [(Na,Al,Cu,Mn)/Fe] against [Fe/H]. However, the thick disk stars tend to have higher [alpha/Fe] and lower [Mn/Fe] than thin disk stars. We also predict the frequency distribution of elemental abundance ratios as functions of time and location, which can be directly compared with galactic archeology projects such as HERMES.

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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