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arXiv 2006.02418astro-ph.CO
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星系际细丝自旋

Intergalactic filaments spin

Qianli Xia, Mark C. Neyrinck, Yan-Chuan Cai, Miguel A. Aragón-Calvo

摘要:

宇宙中的物质被安排在一个宇宙网络中,一条物质细丝通常连接每个相邻的星系对,相隔数千万光年。我们知道细丝周围的四极旋转场会影响星系和它们附近的晕的旋转,但是细丝本身是否旋转仍然是未知的。在这里,我们在宇宙学模拟中测量暗物质围绕暗丝的速度,发现物质通常围绕暗丝旋转,比围绕随机定位的轴旋转快得多。它还表现出沿着灯丝的一些相干性。净旋转分量与已知的四极流相当,并且通常占主导地位。净旋转的证据修正了以前强调的四极旋转场周围的细丝。宇宙网中旋转的全貌比旋转的惯性棒网络更加复杂和多尺度,但我们认为细丝旋转足够重要,足以成为这幅图景的重要组成部分。宇宙中最长的相干旋转物体可能是细丝。此外,我们推测,这种旋转可以提供一种机制,以产生或放大星系际磁场的灯丝。

英文摘要:

Matter in the Universe is arranged in a cosmic web, with a filament of matter typically connecting each neighbouring galaxy pair, separated by tens of millions of light-years. A quadrupolar pattern of the spin field around filaments is known to influence the spins of galaxies and haloes near them, but it remains unknown whether filaments themselves spin. Here, we measure dark-matter velocities around filaments in cosmological simulations, finding that matter generally rotates around them, much faster than around a randomly located axis. It also exhibits some coherence along the filament. The net rotational component is comparable to, and often dominant over, the known quadrupolar flow. The evidence of net rotations revises previous emphasis on a quadrupolar spin field around filaments. The full picture of rotation in the cosmic web is more complicated and multiscale than a network of spinning filamentary rods, but we argue that filament rotation is substantial enough to be an essential part of the picture. It is likely that the longest coherently rotating objects in the Universe are filaments. Also, we speculate that this rotation could provide a mechanism to generate or amplify intergalactic magnetic fields in filaments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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