FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. II. EFFECT OF TURBULENCE AND METAL-LINE COOLING
FORMATION OF COMPACT STELLAR CLUSTERS BY HIGH-REDSHIFT GALAXY OUTFLOWS. II. EFFECT OF TURBULENCE AND METAL-LINE COOLING
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高红移星系外流形成致密星团。
DOI：
10.1088/0004-637x/733/2/88
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
E. Scannapieco
中科院分区：
文献类型：
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作者：
W. Gray;E. Scannapieco
在原始宇宙中，温度低于104 K的低质量结构无法通过原子谱线跃迁冷却，导致恒星形成受到强烈抑制。另一方面，这些“迷你光晕”很容易被附近星系流出物的相互作用触发恒星形成。在Gray & Scannapieco中，我们探讨了非平衡化学对这些相互作用的影响。在这里，我们将注意力转向金属的作用，进行了一系列高分辨率的三维自适应网格细化模拟，包括金属冷却和亚网格湍流混合模型。尽管存在额外的冷却剂，但我们再次发现，外流-微晕相互作用产生了密集的大质量星团分布。我们还发现这些星团均匀地富含金属，最终丰度为Z≈10−2 Z☉。正如我们之前的模拟，所有这些性质都表明，这些相互作用可能导致了今天的晕球状星团的形成。
In the primordial universe, low-mass structures with virial temperatures less than 104 K were unable to cool by atomic line transitions, leading to a strong suppression of star formation. On the other hand, these “minihalos” were highly prone to triggered star formation by interactions from nearby galaxy outflows. In Gray & Scannapieco, we explored the impact of nonequilibrium chemistry on these interactions. Here we turn our attention to the role of metals, carrying out a series of high-resolution three-dimensional adaptive mesh refinement simulations that include both metal cooling and a subgrid turbulent mixing model. Despite the presence of an additional coolant, we again find that outflow–minihalo interactions produce a distribution of dense, massive stellar clusters. We also find that these clusters are evenly enriched with metals to a final abundance of Z ≈ 10−2 Z☉. As in our previous simulations, all of these properties suggest that these interactions may have given rise to present-day halo globular clusters.
DOI：
10.1086/591228
发表时间：
2008-06
期刊：
The Astrophysical Journal
影响因子：
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作者：
E. Scannapieco;M. Brüggen
通讯作者：
E. Scannapieco;M. Brüggen