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Deviations from tidal torque theory: Evolution of the halo spin–filament alignment
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-02-16 , DOI: 10.1093/mnras/stab451
Pablo López 1, 2 , Marius Cautun 3 , Dante Paz 1, 2 , Manuel Merchán 1, 2 , Rien van de Weygaert 4
Affiliation  

The alignment between halo spins and the cosmic web is still poorly understood despite being a widely studied topic. Here, we study this alignment within the context of tidal torque theory (TTT) and deviations from it. To this end, we analyse the evolution of the shape and spin direction of proto-haloes, i.e. of all the volume elements associated to a z = 0 halo, with respect to the present-day filaments. We find that the major axis of proto-haloes undergoes a major change, from being strongly perpendicular to the filament spine in the initial conditions, to being preferentially aligned at the present time. In comparison, the spin orientation shows only a mild evolution: it starts slightly parallel to the filament spine, but the subsequent evolution, up to z ∼ 1, gradually changes its orientation to preferentially perpendicular. In order to analyse these signals in the TTT framework, we split the haloes according to their net spin growth with respect to the median TTT expectation, finding a clear correlation with the spin–filament alignment. At the present time, haloes whose spin grew the most are the ones most perpendicular to the filament spine, while haloes whose spin grew below the median TTT expectation are typically more aligned. The dependence of spin directions on net spin growth is already present in the initial conditions, and gets further modified by late-time, z < 2, evolution. Also, spin directions mildly deviate from the TTT predictions even at high redshift, indicating the need for extensions to the model.

中文翻译:

与潮汐扭矩理论的偏差:晕旋丝排列的演变

尽管是一个广泛研究的话题,但光环自旋和宇宙网之间的对齐仍然知之甚少。在这里,我们在潮汐扭矩理论 (TTT) 及其偏差的背景下研究这种对齐方式。为此,我们分析了原晕的形状和自旋方向的演变,即所有与 az = 0 晕相关的体积元素,相对于当今的细丝。我们发现原晕的主轴发生了重大变化,从初始条件下强烈垂直于细丝脊柱,到现在优先对齐。相比之下,自旋方向仅显示出温和的演变:它开始与细丝脊柱略微平行,但随后的演变,直至 z ∼ 1,逐渐将其方向改变为优先垂直。为了在 TTT 框架中分析这些信号,我们根据它们相对于中值 TTT 预期的净自旋增长来分割光晕,发现与自旋-细丝排列有明显的相关性。目前,自旋增长最多的光晕是最垂直于细丝脊柱的光晕,而自旋增长低于 TTT 预期中值的光晕通常更对齐。自旋方向对净自旋增长的依赖性已经存在于初始条件中,并且通过后期得到进一步修改,z <; 2、进化。此外,即使在高红移情况下,自旋方向也会轻微偏离 TTT 预测,这表明需要对模型进行扩展。发现与自旋灯丝排列有明显的相关性。目前,自旋增长最多的光晕是最垂直于细丝脊柱的光晕,而自旋增长低于 TTT 预期中值的光晕通常更对齐。自旋方向对净自旋增长的依赖性已经存在于初始条件中,并且通过后期得到进一步修改,z <; 2、进化。此外,即使在高红移情况下,自旋方向也会轻微偏离 TTT 预测,这表明需要对模型进行扩展。发现与自旋灯丝排列有明显的相关性。目前,自旋增长最多的光晕是最垂直于细丝脊柱的光晕,而自旋增长低于 TTT 预期中值的光晕通常更对齐。自旋方向对净自旋增长的依赖性已经存在于初始条件中,并且通过后期得到进一步修改,z <; 2、进化。此外,即使在高红移情况下,自旋方向也会轻微偏离 TTT 预测,这表明需要对模型进行扩展。自旋方向对净自旋增长的依赖性已经存在于初始条件中,并且通过后期得到进一步修改,z <; 2、进化。此外,即使在高红移情况下,自旋方向也会轻微偏离 TTT 预测,这表明需要对模型进行扩展。自旋方向对净自旋增长的依赖性已经存在于初始条件中,并且通过后期得到进一步修改,z <; 2、进化。此外,即使在高红移情况下,自旋方向也会轻微偏离 TTT 预测,这表明需要对模型进行扩展。
更新日期:2021-02-16
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