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KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic

Amon, A, Blake, C, Heymans, C, Leonard, CD, 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, EA and Wolf, C (2018) KiDS+2dFLenS+GAMA: testing the cosmological model with the EG statistic. Monthly Notices of the Royal Astronomical Society, 479 (3). pp. 3422-3437. ISSN 0035-8711

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We present a new measurement of EG, 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 EG(¯z=0.267)=0.43±0.13 (GAMA), EG(¯z=0.305)=0.27±0.08 (LOWZ+2dFLOZ), and EG(¯z=0.554)=0.26±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 EG 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
Date Deposited: 22 Jul 2020 09:41
Last Modified: 04 Sep 2021 06:57
DOI or ID number: 10.1093/mnras/sty1624
URI: https://researchonline.ljmu.ac.uk/id/eprint/13340
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