학술논문
Improving Cosmological Constraints from Galaxy Cluster Number Counts with CMB-cluster-lensing Data: Results from the SPT-SZ Survey and Forecasts for the Future
Document Type
article
Author
Chaubal, PS; Reichardt, CL; Gupta, N; Ansarinejad, B; Aylor, K; Balkenhol, L; Baxter, EJ; Bianchini, F; Benson, BA; Bleem, LE; Bocquet, S; Carlstrom, JE; Chang, CL; Crawford, TM; Crites, AT; de Haan, T; Dobbs, MA; Everett, WB; Floyd, B; George, EM; Halverson, NW; Holzapfel, WL; Hrubes, JD; Knox, L; Lee, AT; Luong-Van, D; McMahon, JJ; Meyer, SS; Mocanu, LM; Mohr, JJ; Natoli, T; Padin, S; Pryke, C; Ruhl, JE; Ruppin, F; Salvati, L; Saro, A; Schaffer, KK; Shirokoff, E; Staniszewski, Z; Stark, AA; Vieira, JD; Williamson, R
Source
The Astrophysical Journal. 931(2)
Subject
Language
Abstract
We show the improvement to cosmological constraints from galaxy cluster surveys with the addition of cosmic microwave background (CMB)-cluster lensing data. We explore the cosmological implications of adding mass information from the 3.1σ detection of gravitational lensing of the CMB by galaxy clusters to the Sunyaev-Zel'dovich (SZ) selected galaxy cluster sample from the 2500 deg2 SPT-SZ survey and targeted optical and X-ray follow-up data. In the ΛCDM model, the combination of the cluster sample with the Planck power spectrum measurements prefers σ8ωm/0.30.5=0.831±0.020 . Adding the cluster data reduces the uncertainty on this quantity by a factor of 1.4, which is unchanged whether the 3.1σ CMB-cluster lensing measurement is included or not. We then forecast the impact of CMB-cluster lensing measurements with future cluster catalogs. Adding CMB-cluster lensing measurements to the SZ cluster catalog of the ongoing SPT-3G survey is expected to improve the expected constraint on the dark energy equation of state w by a factor of 1.3 to σ(w) = 0.19. We find the largest improvements from CMB-cluster lensing measurements to be for σ 8, where adding CMB-cluster lensing data to the cluster number counts reduces the expected uncertainty on σ 8 by respective factors of 2.4 and 3.6 for SPT-3G and CMB-S4.