星系动物园：星系自旋手征相干性与恒星形成效率的相关性
Galaxy Zoo: A correlation between coherence of galaxy spin chirality and star formation efficiency
摘要：
我们报告发现星系过去的恒星形成活动和相邻星系旋转轴对齐的程度之间的相关性。这是通过交叉相关的恒星形成的历史，来自与MOPED，和自旋方向（手性），确定由银河动物园项目，SDSS星系的样本。我们的研究结果表明，螺旋星系形成的大部分恒星早期（z > 2）倾向于显示相干旋转超过10 Mpc/h的尺度。对于有大量近期恒星形成的星系，这种相关性较弱。我们发现这种对齐的证据超过5西格玛水平，但与其他星系的恒星属性没有相关性。如果SDSS星系中的大多数老恒星星族都是在过去形成的，在同一条暗条上，大约在同一时间形成的，那么这一发现就可以用分级潮汐力矩理论来解释。而具有显著的近期恒星形成的星系团则在磁场中，因此受到一般潮汐场的影响，这将使它们在随机方向上排列，或者最近合并，这将促进恒星形成，但偏离自旋方向。
英文摘要：
We report on the finding of a correlation between galaxies' past star formation activity and the degree to which neighbouring galaxies rotation axes are aligned. This is obtained by cross-correlating star formation histories, derived with MOPED, and spin direction (chirality), as determined by the Galaxy Zoo project, for a sample of SDSS galaxies. Our findings suggest that spiral galaxies which formed the majority of their stars early (z > 2) tend to display coherent rotation over scales of ~10 Mpc/h. The correlation is weaker for galaxies with significant recent star formation. We find evidence for this alignment at more than the 5-sigma level, but no correlation with other galaxy stellar properties. This finding can be explained within the context of hierarchical tidal-torque theory if the SDSS galaxies harboring the majority of the old stellar population where formed in the past, in the same filament and at about the same time. Galaxies with significant recent star formation instead are in the field, thus influenced by the general tidal field that will align them in random directions or had a recent merger which would promote star formation, but deviate the spin direction.
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