论文标题

用动力学Sunyaev-Zel'Dovich效应测量宇宙丝旋转

Measuring cosmic filament spin with the kinetic Sunyaev-Zel'dovich effect

论文作者

Zheng, Yi, Cai, Yan-Chuan, Zhu, Weishan, Neyrinck, Mark, Wang, Peng, Li, Shaohong

论文摘要

在银河系红移调查中,在模拟中预测了白术丝的自旋,并得到了红移空间丝形形状的暂定证据:通常,其轴的一侧是红移,而蓝光在另一侧进行了蓝光。在这里,我们调查了细丝旋转是否可以具有可测量的Sunyaev-Zel'Dovich(KSZ)信号,从通过移动电离气体散射的CMB光子来看。这种纯净的速度信息与灯丝红移空间形状互补。我们建议通过将星系红移调查与CMB实验相结合来测量KSZ偶极子。我们首先将S/N分析基于现有的灯丝目录及其与Planck数据的结合。然后,我们使用DESI或SKA-2与下一阶段CMB实验的组合研究了KSZ偶极子的可检测性。我们发现,与细丝共旋转的细丝星系的气体晕造成的KSZ偶极子信号比弥漫性丝状气体的信号更强,但是这两个信号似乎都太小,无法在诸如DESI+DESI+Future CMB实验的近期调查中检测到。但是,SKA-2与未来的CMB实验的组合可以提供超过10美元的检测。增益主要来自增加的面积重叠和细丝数量增加,但在未来的CMB实验中,低噪声和高分辨率对于捕获天空中细丝的信号很重要。成功检测信号可能有助于找到大规模结构中的引力效应,并促进我们对宇宙网络中重子的理解。

The spin of intergalactic filaments has been predicted from simulations, and supported by tentative evidence from redshift-space filament shapes in a galaxy redshift survey: generally, a filament is redshifted on one side of its axis, and blueshifted on the other. Here, we investigate whether filament spins could have a measurable kinetic Sunyaev-Zel'dovich (kSZ) signal, from CMB photons being scattered by moving ionised gas; this pure velocity information is complementary to filament redshift-space shapes. We propose to measure the kSZ dipole by combining galaxy redshift surveys with CMB experiments. We base our S/N analyses first on an existing filament catalogue, and its combination with Planck data. We then investigate the detectability of the kSZ dipole using the combination of DESI or SKA-2 with next-stage CMB experiments. We find that the gas halos of filament galaxies co-rotating with filaments induce a stronger kSZ dipole signal than that from the diffuse filamentary gas, but both signals seem too small to be detected in near-term surveys such as DESI+future CMB experiments. But the combination of SKA-2 with future CMB experiments could give a more than 10$σ$ detection. The gain comes mainly from an increased area overlap and an increased number of filaments, but also the low noise and high resolution in future CMB experiments are important to capture signals from filaments small on the sky. Successful detection of the signals may help to find the gravitomagnetic effect in large-scale structure and advance our understanding of baryons in the cosmic web.

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