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

Juliana Kwan, Carles Sanchez, Joseph Clampitt, Jonathan Blazek, Martin Crocce, Bhuvnesh Jain, Joe Zuntz, Adam Amara, Matthew Becker, Gary Bernstein, Christopher Bonnett, Joseph DeRose, Scott Dodelson, Tim Eifler, Enrique Gaztanaga, Tommaso Giannantonio, Daniel Gruen, Will Hartley, Tomasz Kacprzak, Donnacha KirkElisabeth Krause, Niall MacCrann, Ramon Miquel, Youngsoo Park, Ashley Ross, Eduardo Rozo, Eli Rykoff, Erin Sheldon, Michael A. Troxel, Risa Wechsler, Tim Abbott, Filipe Abdalla, Sahar Allam, Aurélien Benoit-Lévy, David Brooks, David Burke, Aurelio Carnero Rosell, Matias Carrasco Kind, Carlos Cunha, Chris D'Andrea, Luiz da Costa, Shantanu Desai, H. Thomas Diehl, Jörg Dietrich, Peter Doel, August Evrard, Enrique Fernandez, David Finley, Robert Nichol, Daniel Thomas, Dark Energy Survey Collaboration

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Abstract

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 deg2 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 Ωm = 0.31 ± 0.09 and the clustering amplitude of the matter power spectrum as σ8 = 0.74 ± 0.13 after marginalizing over seven nuisance parameters and three additional cosmological parameters. This translates into S8 ≡ σ8(Ωm/0.3)0.16 = 0.74 ± 0.12 for our fiducial lens redshift bin at 0.35 < z < 0.5, while S8 = 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.
Original languageEnglish
Pages (from-to)4045-4062
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume464
Issue number4
Early online date5 Oct 2016
DOIs
Publication statusPublished - Feb 2017

Keywords

  • astro-ph.CO
  • gravitational lensing: weak
  • cosmological parameters
  • large-scale structure of Universe
  • RCUK
  • STFC

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