压力支持恒星系统的形成、破裂和性质及其对星系天体物理学的影响
The formation, disruption and properties of pressure-supported stellar systems and implications for the astrophysics of galaxies
摘要：
大多数恒星形成于深深嵌入残余气体中的致密星团中。因此，这些物体必须被视为星系的基本组成部分。有了这一贡献，一些物理过程，在非常早期和后来的致密恒星系统的动力学演化的塑造他们后来的外观和属性，以及他们对宿主星系的影响，突出显示。考虑到质量不断增加的致密系统，结果发现，在10^6 Msol附近，它们的性质发生了根本性的变化：恒星星族变得复杂，出现了星系质量-半径关系，并且中值两体弛豫时间变得比哈勃时间更长。有趣的是，只有两体弛豫时间比哈勃时间长的系统才显示出暗物质的微弱证据，因此dSph星系形成了总的异常值。
英文摘要：
Most stars form in dense star clusters deeply embedded in residual gas. These objects must therefore be seen as the fundamental building blocks of galaxies. With this contribution some physical processes that act in the very early and also later dynamical evolution of dense stellar systems in terms of shaping their later appearance and properties, and the impact they have on their host galaxies, are highlighted. Considering dense systems with increasing mass, it turns out that near 10^6 Msol their properties change fundamentally: stellar populations become complex, a galaxial mass--radius relation emerges and the median two-body relaxation time becomes longer than a Hubble time. Intriguingly, only systems with a two-body relaxation time longer than a Hubble time show weak evidence for dark matter, whereby dSph galaxies form total outliers.
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