低红移宇宙中直径相对星系卫星的速度反相关
Velocity anti-correlation of diametrically opposed galaxy satellites in the low redshift universe
摘要：
最近的研究表明，银河系和仙女座星系都具有意想不到的性质，它们的矮卫星星系排列在薄而运动学相干的平面结构中。现在重要的是评估这种平面结构在较大星系群中的发生率，因为本星系群可能不是一个具有充分代表性的环境。在这里，我们报告说，对完全相对的星系卫星对的速度测量提供了一种从统计上确定运动学相干平面排列普遍性的方法。当地宇宙中（红移$z<0.05$），我们发现，这样的卫星对的银河系中心的距离$150$ kpc的优先反相关的速度（99.994%的置信水平），并在更大的规模的环境（超过150 kpc和高达$\approx 2$ Mpc）的星系的分布是强烈拉长沿轴加入内卫星对（$>7σ$置信度）。我们的发现可能表明，卫星的同向旋转平面，类似于仙女座星系周围所看到的，在自然界中无处不在，而它们的相干运动也表明它们是$\sim 100$ kpc尺度上的角动量的重要储存库。
英文摘要：
Recent work has shown that both the Milky Way and the Andromeda galaxies possess the unexpected property that their dwarf satellite galaxies are aligned in thin and kinematically coherent planar structures. It is now important to evaluate the incidence of such planar structures in the larger galactic population, since the Local Group may not be a sufficiently representative environment. Here we report that the measurement of the velocity of pairs of diametrically opposed galaxy satellites provides a means to determine statistically the prevalence of kinematically coherent planar alignments. In the local universe (redshift $z<0.05$), we find that such satellite pairs out to a galactocentric distance of $150$ kpc are preferentially anti-correlated in their velocities (99.994% confidence level), and that the distribution of galaxies in the larger scale environment (beyond 150 kpc and up to $\approx 2$ Mpc) is strongly elongated along the axis joining the inner satellite pair ($>7σ$ confidence). Our finding may indicate that co-rotating planes of satellites, similar to that seen around the Andromeda galaxy, are ubiquitous in nature, while their coherent motion also suggests that they are a significant repository of angular momentum on $\sim 100$ kpc scales.
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