首页> 外文期刊>The Astrophysical journal >Fishing In Tidal Streams: New Radial Velocity And Proper Motion Constraints On The Orbit Of The Anticenter Stream
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Fishing In Tidal Streams: New Radial Velocity And Proper Motion Constraints On The Orbit Of The Anticenter Stream

机译:在潮汐流中捕鱼:新的径向速度和反运动流轨道上的适当运动约束

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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 streamlike 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.
机译:我们已经获得了反中心流中两个广泛分离的场中恒星的径向速度测量值。结合SDSS / USNO-B的正确运动,新的测量值使我们能够确定流在银河系周围几乎呈圆形,略微倾斜的渐进轨道上。尽管轨道偏心率与先前为Monoceros流确定的偏心率相似,但两个系统的轨道大小,倾斜度和位置都存在很大差异。将最合适的反中心流轨道向前整合,我们发现它沿一条紧密排列的方向并几乎位于先前称为“东带状结构”的类似流特征的顶部。该特征的位置与轨道的远距离重合。我们初步得出结论,此功能是Anticenter Stream的下一个功能。

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