论文标题
通过丰富的聚类来追踪银河系磁盘的组装
Tracing the assembly of the Milky Way's disk through abundance clustering
论文作者
论文摘要
银河形成领域的主要目标是了解银河系磁盘的形成。这样做的第一步是从经验上描述其当前状态。我们使用来自27,135个红色团块恒星的19个丰度的新的高维数据集来检查使用丰度定义的簇的分布。我们探索了不同的维度降低技术并实施非参数聚集层次分层聚类方法。我们看到，使用丰度定义的群体是在空间上分离的，这是年龄的函数。此外，丰度组代表[Fe/H]年龄平面中的不同分布。按年龄订购我们的簇揭示了随着时间的推移，磁盘中化学富集的序列的模式。我们的结果表明，通过对我们报告的经验联系的完整解释，可以追溯磁盘组装细节的有希望的途径。
A major goal in the field of galaxy formation is to understand the formation of the Milky Way's disk. The first step toward doing this is to empirically describe its present state. We use the new high-dimensional dataset of 19 abundances from 27,135 red clump APOGEE stars to examine the distribution of clusters defined using abundances. We explore different dimensionality reduction techniques and implement a non-parametric agglomerate hierarchical clustering method. We see that groups defined using abundances are spatially separated, as a function of age. Furthermore, the abundance groups represent different distributions in the [Fe/H]-age plane. Ordering our clusters by age reveals patterns suggestive of the sequence of chemical enrichment in the disk over time. Our results indicate that a promising avenue to trace the details of the disk's assembly is via a full interpretation of the empirical connections we report.
