论文标题
田野凸线NGC 1172托管的特殊球状簇系统的宽大研究
Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172
论文作者
论文摘要
我们根据GMOS/Gemini（光学），Fourstar/Magellan（NIR）和ACS/HST（光学）的档案数据（光学）（光学）的观察结果（光学）（光学）（光学）的观察结果，介绍了场凸线星系NGC 1172的球状簇系统（GC）的广阔研究。该分析涵盖了GCS的完整扩展，并导致特定频率的值（S_N = 8.6 +/- 1.5）在低密度环境中，对于中间质量的银河系，诸如此类的中间质量银河系也很高。我们发现GCS似乎是双峰的，尽管颜色分布狭窄，并且不允许准确地分离亚群。但是，光学和NIR过滤器的组合使我们能够根据支持双峰性的光度法获得金属性分布的估计。我们得出的结论是，过去，NGC 1172的大量金属贫困球状簇（GCS）和高频点的高频点过去从低质量卫星中获得了大量的GC。
We present a wide-field study of the globular cluster system (GCS) of the field lenticular galaxy NGC 1172, based on observations from GMOS/Gemini (optical), FourStar/Magellan (NIR), and archival data from ACS/HST (optical). This analysis covers the full extension of the GCS, and results in a value of specific frequency (S_N=8.6 +/- 1.5) peculiarly high for an intermediate-mass galaxy in a low-density environment such as this one. We find that the GCS appears to be bimodal, although the colour distribution is narrow and does not allow for an accurate separation of the subpopulations. However, the combination of optical and NIR filters allows us to obtain an estimation of the metallicity distribution based on the photometry, which supports bimodality. We conclude that the presence of a large fraction of metal-poor globular clusters (GCs) and the high specific frequency point to NGC 1172 having accreted a significant amount of GCs from low-mass satellites in the past.
