我们远离局部虚空的特殊运动
Our Peculiar Motion Away from the Local Void
摘要：
发现本星系群在宇宙微波背景偶极子中表现出的特有速度分解为三个主要分量。这三个组成部分是明确分开的，因为它们出现在不同的空间尺度上，而且偶然地几乎正交的影响。最近的，这是由速度不连续性在约7百万秒差距的区别，产生于疏散的本地空隙。我们躺在界定虚空的局部层中。局部席内的随机运动很小。我们的银河系参与了局部片远离局部空洞的整体运动。我们在中等尺度上的运动分量归因于室女星系团及其周围，距离17 Mpc。第三个也是最大的组成部分是一个吸引力，其尺度大于3000 km/s，中心靠近半人马座星团的方向。这三个分量的振幅分别为259、185和455 km/s，在局部幅的参考系中加起来总共为631 km/s。考虑到附近的影响，导致归因于大尺度的残差与观测到的遥远星系的浓度一致，并在一定程度上减少了归因于它们的引力的运动幅度。在小尺度上，除了我们的本地片远离本地空洞的运动之外，最近的相邻细丝，狮子座支线，被认为是朝着一个方向移动，这将导致与我们的细丝会聚。最后，与局部虚空中的孤立星系的良好距离表明，这个矮系统距离虚空中心至少230公里/秒。根据标准宇宙学范式中引力不稳定性理论所预期的速度，从我们的位置到局域虚空中心的距离至少为23 Mpc。局部虚空很大！
英文摘要：
The peculiar velocity of the Local Group of galaxies manifested in the Cosmic Microwave Background dipole is found to decompose into three dominant components. The three components are clearly separated because they arise on distinct spatial scales and are fortuitously almost orthogonal in their influences. The nearest, which is distinguished by a velocity discontinuity at ~7 Mpc, arises from the evacuation of the Local Void. We lie in the Local Sheet that bounds the void. Random motions within the Local Sheet are small. Our Galaxy participates in the bulk motion of the Local Sheet away from the Local Void. The component of our motion on an intermediate scale is attributed to the Virgo Cluster and its surroundings, 17 Mpc away. The third and largest component is an attraction on scales larger than 3000 km/s and centered near the direction of the Centaurus Cluster. The amplitudes of the three components are 259, 185, and 455 km/s, respectively, adding collectively to 631 km/s in the reference frame of the Local Sheet. Taking the nearby influences into account causes the residual attributed to large scales to align with observed concentrations of distant galaxies and reduces somewhat the amplitude of motion attributed to their pull. On small scales, in addition to the motion of our Local Sheet away from the Local Void, the nearest adjacent filament, the Leo Spur, is seen to be moving in a direction that will lead to convergence with our filament. Finally, a good distance to an isolated galaxy within the Local Void reveals that this dwarf system has a motion of at least 230 km/s away from the void center. Given the velocities expected from gravitational instability theory in the standard cosmological paradigm, the distance to the center of the Local Void must be at least 23 Mpc from our position. The Local Void is large!
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