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Cross-correlation of the kinematic Sunyaev-Zel’dovich effect and 21 cm intensity mapping with tidal reconstruction

2019; American Physical Society; Volume: 100; Issue: 2 Linguagem: Inglês

10.1103/physrevd.100.023517

2470-0037

Dongzi Li, Hong-Ming Zhu, Ue‐Li Pen,

Galaxies: Formation, Evolution, Phenomena

We discuss the possibility of studying diffuse baryon distributions with the 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 3D tidal reconstruction algorithm to restore the lost large-scale modes, which increases the correlation by more than a factor of 3. With the predicted foreground level, we expect a $\ensuremath{\sim}20\ensuremath{\sigma}$ detection of kSZ signal for $0.8\ensuremath{\lesssim}z\ensuremath{\lesssim}2.5$ with CHIME and Planck, and a $\ensuremath{\sim}40\ensuremath{\sigma}$ detection with HIRAX and Planck. The significance can be greatly increased with next-generation facilities of higher spatial resolutions.