2019A&A...627A.137J -
Astronomy and Astrophysics, volume 627A, 137-137 (2019/7-1)
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., ESCOFFIER S., GIOCOLI C., METCALF R.B., COMPARAT J., SHAN H.-Y., MAKLER M., KNEIB J.-P., PRADA F., YEPES G. and GOTTLOBER S.
Abstract (from CDS):
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 Ωm=0.31±0.08, in agreement with Planck cosmological results 2018. We also estimate the probe of gravity EG=0.43±0.10, in agreement with ΛCDM-GR predictions of EG=0.40. This analysis reveals that RSD efficiently decreases the GGL uncertainty on Ωm by a factor of 4 and by 30% on σ8. We make our mock catalogues available on the Skies and Universe database.
