Cosmology from large-scale galaxy clustering and galaxy–galaxy lensing with Dark Energy Survey Science Verification data

J. Kwan , C. Sánchez , J. Clampitt , J. Blazek , M. Crocce , B. Jain , J. Zuntz , A. Amara , M.R. Becker , G.M. Bernstein , C. Bonnett , J. Derose , S. Dodelson , T.F. Eifler , E. Gaztanaga , T. Giannantonio , D. Gruen , W.G. Hartley , T. Kacprzak , D. Kirk , E. Krause , N. Maccrann , R. Miquel , Y. Park , A.J. Ross , E. Rozo , E.S. Rykoff , E. Sheldon , M.A. Troxel , R.H. Wechsler , T.M.C. Abbott , F.B. Abdalla , S. Allam , A. Benoit-Levy (1) , D. Brooks , D.L. Burke , A. Carnero Rosell , M. Carrasco Kind , C.E. Cunha , C.B. d'Andrea , L.N. da Costa , S. Desai , H.T. Diehl , J.P. Dietrich , P. Doel , A.E. Evrard , E. Fernandez , D.A. Finley , B. Flaugher , P. Fosalba , J. Frieman , D.W. Gerdes , R.A. Gruendl , G. Gutierrez , K. Honscheid , D.J. James , M. Jarvis , K. Kuehn , O. Lahav , M. Lima , M.A.G. Maia , J.L. Marshall , P. Martini , P. Melchior , J.J. Mohr , R.C. Nichol , B. Nord , A.A. Plazas , K. Reil , A.K. Romer , A. Roodman , E. Sanchez , V. Scarpine , I. Sevilla-Noarbe , R.C. Smith , M. Soares-Santos , F. Sobreira , E. Suchyta , M.E.C. Swanson , G. Tarle , D. Thomas , V. Vikram , A.R. Walker

1 IAP - Institut d'Astrophysique de Paris

We present cosmological constraints from the Dark Energy Survey (DES) using a combined analysis of angular clustering of red galaxies and their cross-correlation with weak gravitational lensing of background galaxies. We use a 139 deg^2 contiguous patch of DES data from the Science Verification (SV) period of observations. Using large-scale measurements, we constrain the matter density of the Universe as Ω_m = 0.31 ± 0.09 and the clustering amplitude of the matter power spectrum as σ_8 = 0.74 ± 0.13 after marginalizing over seven nuisance parameters and three additional cosmological parameters. This translates into S_8 ≡ σ_8(Ω_m/0.3)^0.16 = 0.74 ± 0.12 for our fiducial lens redshift bin at 0.35 < z < 0.5, while S_8 = 0.78 ± 0.09 using two bins over the range 0.2 < z < 0.5. We study the robustness of the results under changes in the data vectors, modelling and systematics treatment, including photometric redshift and shear calibration uncertainties, and find consistency in the derived cosmological parameters. We show that our results are consistent with previous cosmological analyses from DES and other data sets and conclude with a joint analysis of DES angular clustering and galaxy–galaxy lensing with Planck Cosmic Microwave Background data, baryon accoustic oscillations and Supernova Type Ia measurements.

Mots clés: gravitational lensing: weak; cosmological parameters; large-scale structure of Universe

Domaines: Astrophysique [astro-ph]

J. Kwan, C. Sánchez, J. Clampitt, J. Blazek, M. Crocce, et al.. Cosmology from large-scale galaxy clustering and galaxy–galaxy lensing with Dark Energy Survey Science Verification data. Monthly Notices of the Royal Astronomical Society, 2017, 464 (4), pp.4045-4062. ⟨10.1093/mnras/stw2464⟩. ⟨hal-01582835⟩