The Galactic Globular Cluster System as a Fossil Record of Reionization
The Galactic Globular Cluster System as a Fossil Record of Reionization
复制标题
银河系球状星团系统作为再电离化石记录
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Bekki
中科院分区：
文献类型：
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作者：
K. Bekki
我们认为银河系球状星团的结构、运动学和化学性质可能包含着宇宙再电离历史的化石信息。我们首先总结了再电离对银河系GC形成影响的可能观测证据。然后，我们展示了如何在银河系中的GC系统（GCS）的结构特性可以通过抑制GC形成由于再电离在银河系形成通过层次合并的次星系团，通过使用数值模拟与不抑制GC形成再电离的影响。特别是，我们表明，如果GC形成的矮星系，银河系的基石和维里化后再电离时代（zreion）被完全抑制，目前的径向分布的银河系GC强烈依赖于zreion。我们的数值结果意味着，如果GC形成zreion ~ 15后被强烈抑制，银河系GCS的观测到的结构特性的起源可以更自然地解释的框架下的层次聚类方案。
We propose that structural, kinematical, and chemical properties of the Galactic globular clusters (GCs) can contain fossil information of the cosmic reionization history. We first summarize the possible observational evidence for the influence of reionization on the Galactic GC formation. We then show how structural properties of the GC system (GCS) in the Galaxy can be influenced by suppression of GC formation due to reionization during the Galaxy formation through hierarchical merging of subgalactic clumps, by using numerical simulations with and without suppression of GC formation by reionization. In particular, we show that if GC formation in dwarf galaxies that are building blocks of the Galaxy and virialized after reionization era (zreion) are completely suppressed, the present-day radial distribution of the Galactic GCs depends strongly on zreion. Our numerical results imply that if GC formation after zreion ~ 15 is strongly suppressed, the origin of the observed structural properties of the Galactic GCS can be more naturally explained in the framework of the hierarchical clustering scenario.