PREPRINT
3C82830A-FDA1-4B37-9038-EF3BAA921AC2

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

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

Submitted on 9 September 2022

## Abstract

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 scattering off of moving ionized gas; this pure velocity information is rather complementary to filament redshift-space shapes. We develop a technique 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, making simple assumptions about how ionised gas follows the galaxies and matter in each filament, 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 detect 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 $10\sigma$ 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 on baryons in the cosmic web.

## Preprint

Comment: 18 pages, 19 figures, 2 tables

Subject: Astrophysics - Cosmology and Nongalactic Astrophysics