A measurement of the mean central optical depth of galaxy clusters via the pairwise kinematic Sunyaev-Zel'dovich effect with SPT-3G and DES
astro-ph.CO
/ Authors
E. Schiappucci, F. Bianchini, M. Aguena, M. Archipley, L. Balkenhol, L. E. Bleem, P. Chaubal, T. M. Crawford, S. Grandis, Y. Omori
and 132 more authors
C. L. Reichardt, E. Rozo, E. S. Rykoff, C. To, T. M. C. Abbott, P. A. R. Ade, O. Alves, A. J. Anderson, F. Andrade-Oliveira, J. Annis, J. S. Avva, D. Bacon, K. Benabed, A. N. Bender, B. A. Benson, G. M. Bernstein, E. Bertin, S. Bocquet, F. R. Bouchet, D. Brooks, D. L. Burke, J. E. Carlstrom, A. Carnero Rosell,
/ Abstract
We infer the mean optical depth of a sample of optically-selected galaxy clusters from the Dark Energy Survey (DES) via the pairwise kinematic Sunyaev-Zel'dovich (kSZ) effect. The pairwise kSZ signal between pairs of clusters drawn from the DES Year-3 cluster catalog is detected at $4.1 σ$ in cosmic microwave background (CMB) temperature maps from two years of observations with the SPT-3G camera on the South Pole Telescope. After cuts, there are 24,580 clusters in the $\sim 1,400$ deg$^2$ of the southern sky observed by both experiments. We infer the mean optical depth of the cluster sample with two techniques. The optical depth inferred from the pairwise kSZ signal is $\barτ_e = (2.97 \pm 0.73) \times 10^{-3}$, while that inferred from the thermal SZ signal is $\barτ_e = (2.51 \pm 0.55^{\text{stat}} \pm 0.15^{\rm syst}) \times 10^{-3}$. The two measures agree at $0.6 σ$. We perform a suite of systematic checks to test the robustness of the analysis.