论文标题
低质量自旋偏置的物理起源
The physical origins of low-mass spin bias
论文作者
论文摘要
在$ z = 0 $中，具有质量高于$ \ log（\ text {m} _ {\ text {c}}}/h^{ - 1} \ text {m} _ \ odot）\ simeq 11.5 $比同一质量较低的孤立的偏见更高的高旋转光环（但是，已知这种趋势将在此特征交叉质量下方倒置，$ \ text {m} _ {\ text {c}} $。在本文中，我们测量了低质量端的光环自旋偏置的红移演化和尺度依赖性，并证明信号的反转完全是由飞溅光环的效果产生的。这些低质量的光环倾向于生活在更大的光环的附近，从而具有其大规模偏置特性。我们进一步表明，与红移相关的跨界质量尺度$ \ text {m} _ {\ text {c}}（z）$的位置完全取决于低和高速旋转亚种群中飞溅的相对丰度。一旦从样品中取出飞溅光环，恢复了自旋偏置的固有质量依赖性。由于已证明飞溅式返回可以解释低质量端的一些组装偏置信号，因此我们的结果揭示了两个不同的二级偏置趋势之间的特定联系：自旋偏置和组装偏置。
At $z=0$, higher-spin haloes with masses above $\log(\text{M}_{\text{c}}/h^{-1}\text{M}_\odot)\simeq 11.5$ have a higher bias than lower-spin haloes of the same mass. However, this trend is known to invert below this characteristic crossover mass, $\text{M}_{\text{c}}$. In this paper, we measure the redshift evolution and scale dependence of halo spin bias at the low-mass end and demonstrate that the inversion of the signal is entirely produced by the effect of splashback haloes. These low-mass haloes tend to live in the vicinity of significantly more massive haloes, thus sharing their large-scale bias properties. We further show that the location of the redshift-dependent crossover mass scale $\text{M}_{\text{c}}(z)$ is completely determined by the relative abundance of splashbacks in the low- and high-spin subpopulations. Once splashback haloes are removed from the sample, the intrinsic mass dependence of spin bias is recovered. Since splashbacks have been shown to account for some of the assembly bias signal at the low-mass end, our results unveil a specific link between two different secondary bias trends: spin bias and assembly bias.
