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Cosmology from cosmic shear with Dark Energy Survey Science Verification Data

Research output: Contribution to journalArticle

  • T. Abbott
  • F. B. Abdalla
  • S. Allam
  • Professor Adam Amara
  • J. Annis
  • R. Armstrong
  • Dr David Bacon
  • M. Banerji
  • A. H. Bauer
  • Eric Baxter
  • M. R. Becker
  • A. Benoit-Lévy
  • R. A. Bernstein
  • G. M. Bernstein
  • E. Bertin
  • J. Blazek
  • C. Bonnett
  • S. L. Bridle
  • D. Brooks
  • C. Bruderer
  • E. Buckley-Geer
  • D. L. Burke
  • M. T. Busha
  • D. Capozzi
  • A. Carnero Rosell
  • M. Carrasco Kind
  • J. Carretero
  • F. J. Castander
  • C. Chang
  • J. Clampitt
  • M. Crocce
  • C. E. Cunha
  • C. B. D'Andrea
  • L. N. da Costa
  • R. Das
  • D. L. DePoy
  • S. Desai
  • H. T. Diehl
  • J. P. Dietrich
  • S. Dodelson
  • P. Doel
  • A. Drlica-Wagner
  • G. Efstathiou
  • T. F. Eifler
  • B. Erickson
  • J. Estrada
  • A. E. Evrard
  • A. Fausti Neto
  • Professor Bob Nichol
  • Professor Daniel Thomas
  • Dark Energy Survey Collaboration
We present the first constraints on cosmology from the Dark Energy Survey (DES), using weak lensing measurements from the preliminary Science Verification (SV) data. We use 139 square degrees of SV data, which is less than 3% of the full DES survey area. Using cosmic shear 2-point measurements over three redshift bins we find σ8(Ωm/0.3)0.5=0.81±0.06 (68% confidence), after marginalizing over 7 systematics parameters and 3 other cosmological parameters. We examine the robustness of our results to the choice of data vector and systematics assumed, and find them to be stable. About 20% of our error bar comes from marginalizing over shear and photometric redshift calibration uncertainties. The current state-of-the-art cosmic shear measurements from CFHTLenS are mildly discrepant with the cosmological constraints from Planck CMB data; our results are consistent with both data sets. Our uncertainties are ∼30% larger than those from CFHTLenS when we carry out a comparable analysis of the two data sets, which we attribute largely to the lower number density of our shear catalogue. We investigate constraints on dark energy and find that, with this small fraction of the full survey, the DES SV constraints make negligible impact on the Planck constraints. The moderate disagreement between the CFHTLenS and Planck values of σ8(Ωm/0.3)0.5 is present regardless of the value of ω.
Original languageEnglish
Article number022001
JournalPhysical Review D
Volume94
Issue number2
DOIs
Publication statusPublished - 6 Jul 2016

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  • Physical Review D 022001

    Rights statement: The final published version of this article by T. Abbott et al., 'Cosmology from cosmic shear with Dark Energy Survey Science Verification data,' Phys. Rev. D. 94, 022001, can be located online at https://doi.org/10.1103/PhysRevD.94.022001. © 2016 American Physical Society.

    Final published version, 1.01 MB, PDF document

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