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ALIGNMENTS OF THE GALAXIES IN AND AROUND THE VIRGO CLUSTER WITH THE LOCAL VELOCITY SHEAR

机译:带有局部速度剪切的处女座群集周围的星系对

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Observational evidence is presented for the alignment between the cosmic sheet and the principal axis of the velocity shear field at the position of the Virgo cluster. The galaxies in and around the Virgo cluster from the Extended Virgo Cluster Catalog that was recently constructed by Kim et al. are used to determine the direction of the local sheet. The peculiar velocity field reconstructed from the Sloan Digital Sky Survey Data Release 7 is analyzed to estimate the local velocity shear tensor at the Virgo center. Showing first that the minor principal axis of the local velocity shear tensor is almost parallel to the direction of the line of sight, we detect a clear signal of alignment between the positions of the Virgo satellites and the intermediate principal axis of the local velocity shear projected onto the plane of the sky. Furthermore, the dwarf satellites are found to appear more strongly aligned than their normal counterparts, which is interpreted as an indication of the following. (1) The normal satellites and the dwarf satellites fall in the Virgo cluster preferentially along the local filament and the local sheet, respectively. (2) The local filament is aligned with the minor principal axis of the local velocity shear while the local sheet is parallel to the plane spanned by the minor and intermediate principal axes. Our result is consistent with the recent numerical claim that the velocity shear is a good tracer of the cosmic web.
机译:观察到的证据为宇宙片与处女座星团位置处的速度剪切场主轴之间的对准提供了证据。 Kim等人最近建立的扩展的处女座星团目录中的处女座星团及其周围的星系。用于确定局部图纸的方向。分析了从斯隆数字天空测量数据版本7重建的特殊速度场,以估计处女座中心的局部速度剪切张量。首先显示局部速度切变张量的次主轴几乎与视线方向平行,我们检测到处女座卫星的位置与投影的局部速度切变的中间主轴之间存在清晰的对准信号在天空的平面上。此外,发现矮卫星比其正常对应星更强地对准,这被解释为以下情况的指示。 (1)正常卫星和矮卫星分别沿着局部的细丝和局部的片落在处女座星系中。 (2)局部细丝与局部速度剪切的短主轴对齐,而局部薄板平行于由短主轴和中间主轴跨越的平面。我们的结果与最近的数值主张一致,即速度剪切是宇宙网的良好示踪剂。

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