深渊的溪流：围绕着内星系的一群纠缠在一起的恒星流
The Streams of the Gaping Abyss: A population of entangled stellar streams surrounding the Inner Galaxy
摘要：
我们提出了一个大的人口的恒星流，围绕银河系内部，发现在盖亚DR2目录使用新的STREAMFINDER算法的发现。在这里，我们专注于八个新的高意义的结构，发现在日心距离1和10千秒差距和银河系纬度$|b|>20°$，命名为Slidr，Sylgr，Ylgr，Fimbulthul，Svöl，Fjörm，Gjöll和Leiptr的属性。对其中七条流的光谱测量证实了仅基于盖亚天体测量和测光的检测结果，并表明这些流主要是贫金属的。样品具有不同的轨道特性，虽然大多数的流似乎是内晕球状星团的碎片。在我们的地图中可以看到更多的候选流，但需要后续光谱来确认它们的性质。我们还详细解释了算法的工作原理，并通过在盖亚目录的平滑模型上运行算法来衡量错误检测的发生率。
英文摘要：
We present the discovery of a large population of stellar streams that surround the inner Galaxy, found in the Gaia DR2 catalog using the new STREAMFINDER algorithm. Here we focus on the properties of eight new high-significance structures found at Heliocentric distances between 1 and 10 kpc and at Galactic latitudes $|b|>20°$, named Slidr, Sylgr, Ylgr, Fimbulthul, Svöl, Fjörm, Gjöll and Leiptr. Spectroscopic measurements of seven of the streams confirm the detections, which are based on Gaia astrometry and photometry alone, and show that these streams are predominantly metal-poor. The sample possesses diverse orbital properties, although most of the streams appear to be debris of inner-halo globular clusters. Many more candidate streams are visible in our maps, but require follow-up spectroscopy to confirm their nature. We also explain in detail the workings of the algorithm, and gauge the incidence of false detections by running the algorithm on a smooth model of the Gaia catalog.
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