论文标题
球形富含超湿星系的动力摩擦：NGC5846-UDG1的情况
Dynamical friction in globular cluster-rich ultra-diffuse galaxies: the case of NGC5846-UDG1
论文作者
论文摘要
包含大量球状簇（GC）样本的超湿星系为测试银河动力学理论的预测提供了机会。 NGC5846-UDG1是一个很好的例子，拥有数十名GC候选者的高质量样本。我们表明，在NGC5846-UDG1中观察到的GC的分布暗示着由重力动力学摩擦引起的质量分离。我们提出了一个简单的分析计算，并以一系列数值模拟为支持，这些计算自然地解释了观察到的GC质量和径向位置的当前模式。根据出生时GC人群的一些假设，该分析支持NGC5846-UDG1居住在大型暗物质晕中的可能性。这是将富含GC的系统用作暗物质的动态示踪剂的一个示例。
Ultra-diffuse galaxies that contain a large sample of globular clusters (GCs) offer an opportunity to test the predictions of galactic dynamics theory. NGC5846-UDG1 is an excellent example, with a high-quality sample of dozens of GC candidates. We show that the observed distribution of GCs in NGC5846-UDG1 is suggestive of mass segregation induced by gravitational dynamical friction. We present simple analytic calculations, backed by a series of numerical simulations, that naturally explain the observed present-day pattern of GC masses and radial positions. Subject to some assumptions on the GC population at birth, the analysis supports the possibility that NGC5846-UDG1 resides in a massive dark matter halo. This is an example for the use of GC-rich systems as dynamical (in addition to kinematical) tracers of dark matter.
