宇宙晕中的恒星形成和棒不稳定性
Star formation and bar instability in cosmological haloes
摘要：
这是第三个一系列的论文提出了第一次尝试分析增长的酒吧不稳定性在一个一致的宇宙学方案。在前两篇文章中，我们探讨了宇宙学对恒星盘的作用，以及气体成分对嵌入宇宙学暗物质晕中的盘的影响。本文的目的是指出恒星形成对具有不同气体分数的盘内的杆不稳定性的影响。我们进行宇宙学模拟相同的磁盘晕质量系统在以前的作品中，恒星的形成没有被触发。我们将新的模拟结果与以前的模拟结果进行比较，通过分析恒星组件的形态，棒强度，模式速度的行为来研究恒星形成的影响。我们跟踪的气体和中心的质量浓度在演化过程中，以及它们对酒吧的强度的影响。在我们所有的宇宙学模拟中，一个恒星棒，持续10 Gyr，仍然生活在z=0。气体和新恒星的中心质量浓度对棒的椭圆率有温和的作用，但不能破坏它;在z=0时，恒星棒的强度因恒星形成而增强。条斑图的速度随着盘的演化而减小。
英文摘要：
This is the third of a series of papers presenting the first attempt to analyze the growth of the bar instability in a consistent cosmological scenario. In the previous two articles we explored the role of the cosmology on stellar disks, and the impact of the gaseous component on a disk embedded in a cosmological dark matter halo. The aim of this paper is to point out the impact of the star formation on the bar instability inside disks having different gas fractions. We perform cosmological simulations of the same disk-to-halo mass systems as in the previous works where the star formation was not triggered. We compare the results of the new simulations with the previous ones to investigate the effect of the star formation by analysing the morphology of the stellar components, the bar strength, the behaviour of the pattern speed. We follow the gas and the central mass concentration during the evolution and their impact on the bar strength. In all our cosmological simulations a stellar bar, lasting 10 Gyr, is still living at z=0. The central mass concentration of gas and of the new stars has a mild action on the ellipticity of the bar but is not able to destroy it; at z=0 the stellar bar strength is enhanced by the star formation. The bar pattern speed is decreasing with the disk evolution.
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