Detection of pairwise kSZ effect with DESI galaxy clusters and Planck

Understand

We report a $5\sigma$ detection of the pairwise kinematic Sunyaev-Zel'dovich (kSZ) effect, combining galaxy clusters in DESI imaging surveys and the Planck temperature maps.

• The detection is facilitated by both improvements in the data and in the analysis method.
• For the data, we adopt the recently released galaxy group catalog (Y20: \cite{yang2020extended}) with $\sim 10^6$ robustly-identified groups, and construct various galaxy cluster samples for the kSZ measurement.
• The Y20 catalogue also provides estimation of halo mass, which further improves the kSZ measurement by $\sim 10\%$.