The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction

Abstract

We discuss the possibility of studying diffuse baryon distributions with kinematic Sunyaev-Zel'dovich (kSZ) effect by correlating cosmic microwave background (CMB) temperature fluctuations with density fluctuations from 21\,cm intensity mapping (IM). The biggest challenge for the cross-correlation is the loss of large-scale information in IM, due to foregrounds and the zero spacing problem of interferometers. We apply the tidal reconstruction algorithm to restore the lost large-scale modes, which increases the correlation by more than a factor of three. With the predicted foreground level, we expect a $\sim 20\sigma$ detection of kSZ signal for $0.8\lesssim z\lesssim 2.5$ with CHIME and Planck, and a $\sim 40\sigma$ detection with HIRAX and Planck. The significance can be greatly increased with next-generation facilities of higher spatial resolutions.

8 pages, 4 figures, submit to PRD

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Cited by in corpus (13)

• Data Analysis for Precision 21 cm Cosmology
• Recovering the Wedge Modes Lost to 21-cm Foregrounds
• Astrophysics & Cosmology from Line Intensity Mapping vs Galaxy Surveys
• Kinetic Sunyaev-Zel'dovich tomography with line-intensity mapping
• Density reconstruction from biased tracers and its application to primordial non-Gaussianity
• Reconstructing large scales at cosmic dawn
• Pairwise kSZ signal extraction efficacy and optical depth estimation
• Cosmic Tidal Reconstruction with Halo Fields
• Cross-correlation of the Polarizations of the 21-cm and Cosmic Microwave Backgrounds
• kSZ Pairwise Velocity Reconstruction with Machine Learning
• Direct correlation of line intensity mapping and CMB lensing from evolution along the lightcone
• Cluster optical depth and pairwise velocity estimation using machine learning
• Clustering redshifts with the 21cm-galaxy cross-bispectrum