The Cross-correlation of KSZ Effect and 21 cm Intensity Mapping with Tidal Reconstruction. (arXiv:1811.05012v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Li_D/0/1/0/all/0/1">Dongzi Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhu_H/0/1/0/all/0/1">Hong-Ming Zhu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pen_U/0/1/0/all/0/1">Ue-Li Pen</a>

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
$sim20,sigma$ detection of kSZ signal for $0.8lesssim zlesssim2.5$ with
CHIME and Planck, and a $sim40, sigma$ detection with HIRAX and Planck. The
significance can be greatly increased with next-generation facilities of higher
spatial resolutions.

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
$sim20,sigma$ detection of kSZ signal for $0.8lesssim zlesssim2.5$ with
CHIME and Planck, and a $sim40, sigma$ detection with HIRAX and Planck. The
significance can be greatly increased with next-generation facilities of higher
spatial resolutions.

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