银河系北冠的一团恒星流
A tangle of stellar streams in the north Galactic cap
摘要：
恒星晕的子结构是利用统计光度视差的蓝色主序星关闭从斯隆数字巡天条纹在北银河帽。四个结构与先前对人马座矮潮汐流的测量结果一致：领先的尾巴，“分叉”流，尾随的尾巴和C流。室女座距离太阳约15千秒差距的恒星密度过高，可能是因为平行星流和一个新的候选星流（被称为恒周星流）的交叉。这些数据表明在NGC 5466附近存在一个宽流，距离为5至15 kpc。从14条条纹中测量到的平滑恒星晕的平坦度平均为q=0.58，色散为0.04。
英文摘要：
Stellar halo substructures were identified using statistical photometric parallax of blue main sequence turnoff stars from fourteen Sloan Digital Sky Survey stripes in the north Galactic cap. Four structures are consistent with previous measurements of the Sagittarius dwarf tidal stream: the leading tail, the "bifurcated" stream, the trailing tail, and Stream C. The stellar overdensity in Virgo, about 15 kpc from the Sun, could arise from the crossing of the Parallel Stream and a new, candidate stream dubbed the Perpendicular Stream. The data suggests the presence of a wide stream near NGC 5466, with a distance of 5 to 15 kpc. Measurements of the flattening of the smooth stellar halo from the fourteen stripes average q=0.58, with a dispersion of 0.04.
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