KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic. Issue 3 (23rd June 2018)

• Record Type: Journal Article
• Authors: Amon, A; Blake, C; Heymans, C; Leonard, C D; Asgari, M; Bilicki, M; Choi, A; Erben, T; Glazebrook, K; Harnois-Déraps, J; Hildebrandt, H; Hoekstra, H; Joachimi, B; Joudaki, S; Kuijken, K; Lidman, C; Loveday, J; Parkinson, D; Valentijn, E A; Wolf, C
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 479:Issue 3(2018)
• Page Start: 3422
• Page End: 3437
• Publication Date: 2018-06-23
• Subjects: gravitational lensing: weak -- surveys, cosmology: observations, large-scale structure of Universe; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty1624
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present a new measurement of E G, which combines measurements of weak gravitational lensing, galaxy clustering, and redshift-space distortions. This statistic was proposed as a consistency test of General Relativity (GR) that is insensitive to linear, deterministic galaxy bias, and the matter clustering amplitude. We combine deep imaging data from KiDS with overlapping spectroscopy from 2dFLenS, BOSS DR12, and GAMA and find $E_{\rm G}(\overline{z}=0.267)=0.43 \pm 0.13$ (GAMA), $E_{\rm G}(\overline{z}=0.305)=0.27 \pm 0.08$ (LOWZ+2dFLOZ), and $E_{\rm G}(\overline{z}=0.554)=0.26 \pm 0.07$ (CMASS+2dFHIZ). We demonstrate that the existing tension in the value of the matter density parameter hinders the robustness of this statistic as solely a test of GR. We find that our E G measurements, as well as existing ones in the literature, favour a lower matter density cosmology than the cosmic microwave background. For a flat ΛCDM Universe, we find Ωm ( z = 0) = 0.25 ± 0.03. With this paper, we publicly release the 2dFLenS data set at: http://2dflens.swin.edu.au .