Testing gravity with galaxy-galaxy lensing and redshift-space distortions using 
CFHT-Stripe 82, CFHTLenS, and BOSS CMASS datasets

Jullo, E.; de la Torre, S.; Cousinou, M.-C.; Escoer, S.; Giocoli, C.; Metcalf, R. B.; Comparat, J.; Shan, H.-Y.; Makler, M.; Kneib, J.-P.; Prada, F.; Yepes, G.; Gottlöber, S.

doi:10.1051/0004-6361/201834629

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Testing gravity with galaxy-galaxy lensing and redshift-space distortions using CFHT-Stripe 82, CFHTLenS, and BOSS CMASS datasets

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Comparat, J.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Jullo, E., de la Torre, S., Cousinou, M.-C., Escoer, S., Giocoli, C., Metcalf, R. B., et al. (2019). Testing gravity with galaxy-galaxy lensing and redshift-space distortions using CFHT-Stripe 82, CFHTLenS, and BOSS CMASS datasets. Astronomy and Astrophysics, 627: A137. doi:10.1051/0004-6361/201834629.

Cite as: https://hdl.handle.net/21.11116/0000-0004-ECDF-8

Abstract

The combination of galaxy-galaxy lensing (GGL) and redshift space distortion of galaxy clustering (RSD) is a privileged technique to test general relativity predictions and break degeneracies between the growth rate of structure parameter f and the amplitude of the linear power spectrum σ₈. We performed a joint GGL and RSD analysis on 250 sq. deg using shape catalogues from CFHTLenS and CFHT-Stripe 82 and spectroscopic redshifts from the BOSS CMASS sample. We adjusted a model that includes non-linear biasing, RSD, and Alcock–Paczynski effects. We used an N-body simulation supplemented by an abundance matching prescription for CMASS galaxies to build a set of overlapping lensing and clustering mocks. Together with additional spectroscopic data, this helps us to quantify and correct several systematic errors, such as photometric redshifts. We find f(z = 0.57) = 0.95 ± 0.23, σ₈(z = 0.57) = 0.55 ± 0.07 and Ω_m = 0.31 ± 0.08, in agreement with Planck cosmological results 2018. We also estimate the probe of gravity E_G = 0.43 ± 0.10, in agreement with ΛCDM−GR predictions of E_G = 0.40. This analysis reveals that RSD efficiently decreases the GGL uncertainty on Ω_m by a factor of 4 and by 30% on σ₈. We make our mock catalogues available on the Skies and Universe database.