Papers › The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction
The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction
Dongzi Li, Hong-Ming Zhu, Ue-Li Pen
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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 ∼20 σ detection of kSZ signal for 0.8≲z≲2.5 with CHIME and Planck, and a ∼40 σ detection with HIRAX and Planck. The significance can be greatly increased with next-generation facilities of higher spatial resolutions.
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