http://arxiv.org/abs/2208.07847
The kinetic Sunyaev-Zel’dovich (kSZ) effect, i.e., the Doppler boost of cosmic microwave background (CMB) photons caused by their scattering off free electrons in galaxy clusters and groups with non-zero bulk velocity, is a powerful window on baryons in the universe. We present the first halo-model computation of the cross-power spectrum of the “projected-field” kSZ signal with large-scale structure (LSS) tracers. We compare and validate our calculations against previous studies, which relied on $N$-body-calibrated effective formulas rather than the halo model. We forecast results for CMB maps from the Atacama Cosmology Telescope (AdvACT), Simons Observatory (SO), and CMB-S4, and LSS survey data from the Dark Energy Survey, the Vera C.~Rubin Observatory (VRO), and \textit{Euclid}. In cross-correlation with galaxy number density, for AdvACT $\times$ \textit{unWISE} we forecast an 18$\sigma$ projected-field kSZ detection using data already in hand. Combining SO CMB maps and \textit{unWISE} galaxy catalogs, we expect a $62\sigma$ detection, yielding precise measurements of the gas density profile radial slopes. Additionally, we forecast first detections of the kSZ — galaxy weak lensing cross-correlation with AdvACT $\times$ VRO/\textit{Euclid} (at 6$\sigma$) and of the kSZ — CMB weak lensing cross-correlation with SO (at 16$\sigma$). Finally, $\approx 10-20$\% precision measurements of the shape of the gas density profile should be possible with CMB-S4 kSZ — CMB lensing cross-correlation without using any external datasets.
B. Bolliet, J. Hill, S. Ferraro, et. al.
Wed, 17 Aug 22
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