帽子上的羽毛：追踪松布雷罗星系周围的巨大恒星流
A feather on the hat: Tracing the giant stellar stream around the Sombrero galaxy
摘要：
最近在草帽星系（M104）晕中发现的极富金属恒星的证据表明，这个星系最近经历了一次与一个相对巨大的星系的合并。在本文中，我们提出了一个18厘米的业余望远镜的目的是检测任何相干的潮汐功能，从这个可能的主要合并的M104郊区的宽视场深的图像。我们的新数据，加上M104内晕的模型和场周围恒星的散射光，使我们能够首次追踪星系盘两侧流的完整路径。我们充分的环形潮汐结构的特点，我们确认，这是唯一可观察到的相干子结构的内晕区。这一结果与M104是由3.5 Gyr前的一次湿合并产生的假设相一致，该合并加热了恒星星族，模糊了所有旧的子结构。我们生成了一组数值模型，再现所观察到的潮汐结构的形成。我们的最佳拟合模型表明，在最后3个Gyr中，该气流的形成与创建M104系统的湿主合并无关。因此，潮汐流的形成可以限制大合并发生的时间。
英文摘要：
Recent evidence of extremely metal-rich stars found in the Sombrero galaxy (M104) halo suggests that this galaxy has undergone a recent major merger with a relatively massive galaxy. In this paper, we present wide-field deep images of the M104 outskirts obtained with a 18-cm amateur telescope with the purpose of detecting any coherent tidal features from this possible major merger. Our new data, together with a model of the M104 inner halo and scattered light from stars around the field, allow us to trace for the first time the full path of the stream on both sides of the disk of the galaxy. We fully characterize the ring-like tidal structure and we confirm that this is the only observable coherent substructure in the inner halo region. This result is in agreement with the hypothesis that M104 was created by a wet major merger more than 3.5 Gyr ago that heated up the stellar population, blurring all old substructure. We generated a set of numerical models that reproduce the formation of the observed tidal structure. Our best fit model suggests the formation of this stream in the last 3 Gyr is independent of the wet major merger that created the M104 system. Therefore, the formation of the tidal stream can put a constraint on the time when the major merger occurred.
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