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arXiv 2209.04464astro-ph.CO
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用动力学Sunyaev-Zel'dovich效应测量宇宙细丝自旋

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

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

摘要:

星系际暗条的自旋已经通过模拟得到了预测,并得到了星系红移观测中红移空间暗条形状的初步证据的支持:通常,暗条在其轴的一侧发生红移,而在另一侧发生蓝移。在这里,我们调查是否灯丝自旋可以有一个可测量的动力学Sunyaev-Zel'dovich(kSZ)信号,从CMB光子被散射移动电离气体,这种纯速度信息是互补的灯丝红移空间形状。我们建议结合星系红移巡天和宇宙微波背景实验来测量kSZ偶极子。我们的S/N分析首先基于现有的灯丝目录,并结合普朗克数据。然后,我们调查的可探测性的kSZ偶极子使用DESI或SKA-2与下一阶段的CMB实验相结合。我们发现,气体晕的灯丝星系共同旋转的灯丝诱导一个更强的kSZ偶极子信号比从弥漫的对流气体,但这两个信号似乎太小,在近期的调查,如DESI+未来的CMB实验检测。但SKA-2与未来CMB实验的结合可以提供超过10个$σ$的检测。增益主要来自增加的面积重叠和增加的灯丝数量,但在未来的CMB实验中,低噪声和高分辨率对于捕获来自天空中小灯丝的信号也很重要。这些信号的成功探测将有助于发现大尺度结构中的重磁效应,并进一步加深我们对宇宙网中重子的认识。

英文摘要:

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.

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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