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Possible observational evidence for cosmic filament spin
Nature Astronomy ( IF 14.1 ) Pub Date : 2021-06-14 , DOI: 10.1038/s41550-021-01380-6
Peng Wang , Noam I. Libeskind , Elmo Tempel , Xi Kang , Quan Guo

Although structures in the Universe form on a wide variety of scales, from small dwarf galaxies to large super clusters, the generation of angular momentum across these scales is poorly understood. Here we investigate the possibility that filaments of galaxies—cylindrical tendrils of matter hundreds of millions of light years across—are themselves spinning. By stacking thousands of filaments together and examining the velocity of galaxies perpendicular to the filament’s axis (via their redshift and blueshift), we find that these objects too display vortical motion consistent with rotation, making them the largest objects known to have angular momentum. The strength of the rotation signal is directly dependent on the viewing angle and the dynamical state of the filament. Filament rotation is more clearly detected when viewed edge-on. In addition, the more massive the haloes that sit at either end of the filaments, the more rotation is detected. These results signify that angular momentum can be generated on unexpectedly large scales.



中文翻译:

宇宙长丝自旋的可能观测证据

尽管宇宙中的结构在各种尺度上形成,从小型矮星系到大型超级星团,但对这些尺度上角动量的产生知之甚少。在这里,我们研究了星系细丝——直径数亿光年的圆柱形卷须——本身正在旋转的可能性。通过将数千个细丝堆叠在一起并检查垂直于细丝轴的星系的速度(通过它们的红移和蓝移),我们发现这些物体也显示出与旋转一致的涡旋运动,使它们成为已知具有角动量的最大物体。旋转信号的强度直接取决于视角和灯丝的动态状态。当从侧面观察时,可以更清楚地检测到灯丝旋转。此外,位于细丝两端的光晕越大,检测到的旋转就越多。这些结果表明角动量可以在意想不到的大尺度上产生。

更新日期:2021-06-14
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