论文标题
银河球状簇类型特性的统计分析
Statistical analysis of Galactic globular cluster type properties
论文作者
论文摘要
银河球状簇（GCS）的伪色图，所谓的染色体图（所谓的染色体图）允许将其分类为I型和II型簇。 II型GC的特征是其染色体图的平均复杂性高于平均水平，其中一些众所周知会显示出包括铁在内的缓慢中子捕获反应元件的星到明星的变化。这是基于一个假设，即II型GC可能具有外层状的起源，随后被银河系积聚。我们进行了主成分分析，以根据这种新的分类来探索各种GCS参数之间的可能相关性。分析表明，集群类型主要与相对年龄相关。这种关系的原因进一步研究了发现，更多金属富含金属的II型群集似乎年轻，距离银河中心更遥远。还观察到了对银河坐标Z阳性Z的正值的II型簇的耗竭，未检测到Z $ \ SIM2 $ KPC的II型簇。 II型簇轨道的偏心率也比I型具有更大的偏心率。
The analysis of pseudo-colour diagrams, the so-called chromosome maps, of Galactic globular clusters (GCs) permits to classify them into type I and type II clusters. Type II GCs are characterized by an above-the-average complexity of their chromosome maps and some of them are known to display star-to-star variations of slow neutron-capture reaction elements including iron. This is at the basis of the hypothesis that type II GCs may have an extragalactic origin and were subsequently accreted by the Milky Way. We performed a Principal Component Analysis to explore possible correlations among various GCs parameters in the light of this new classification. The analysis revealed that cluster type correlates mainly with relative age. The cause of this relation was further investigated finding that more metal-rich type II clusters, also appear to be younger and more distant from the Galactic centre. A depletion of type II clusters for positive values of Galactic coordinate Z was also observed, with no type II clusters detected above Z$\sim2$ kpc. Type II cluster orbits also have larger eccentricities than type I ones.
