在潮汐流中捕鱼：对反中心流轨道的新径向速度和自行约束
Fishing in Tidal Streams: New Radial Velocity and Proper Motion Constraints on the Orbit of the Anticenter Stream
摘要：
我们已经获得了径向速度测量的恒星在两个，广泛分离的领域中的Anticenter流。结合SDSS/USNO-B自行，新的测量使我们能够确定该流是在一个接近圆形的，有点倾斜的，围绕银河系的椭圆轨道上。虽然轨道偏心率与先前确定的麒麟座流相似，但两个系统的大小、倾角和轨道位置有很大不同。整合我们最好的拟合Anticenter流轨道向前，我们发现，它是紧密对齐，几乎是在一个类似流的功能，以前指定的“东部带状结构”的顶部。这一特征的位置与轨道的远星系角重合。我们初步得出结论，这个功能是下一个包裹的Anticenter流。
英文摘要：
We have obtained radial velocity measurements for stars in two, widely-separated fields in the Anticenter Stream. Combined with SDSS/USNO-B proper motions, the new measurements allow us to establish that the stream is on a nearly circular, somewhat inclined, prograde orbit around the Galaxy. While the orbital eccentricity is similar to that previously determined for the Monoceros stream, the sizes, inclinations, and positions of the orbits for the two systems differ significantly. Integrating our best fitting Anticenter Stream orbit forward, we find that it is closely aligned along and lies almost on top of a stream-like feature previously designated the "Eastern Banded Structure". The position of this feature coincides with the apogalacticon of the orbit. We tentatively conclude that this feature is the next wrap of the Anticenter Stream.
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