KiDS-450: cosmological constraints from weak lensing peak statistics - I. Inference from analytical prediction of high signal-to-noise ratio convergence peaks

HuanYuan Shan, Xiangkun Liu, Hendrik Hildebrandt, Chuzhong Pan, Nicolas Martinet, Zuhui Fan, Peter Schneider, Marika Asgari, Joachim Harnois-Déraps, Henk Hoekstra, Angus Wright, Jörg P. Dietrich, Thomas Erben, Fedor Getman, Aniello Grado, Catherine Heymans, Dominik Klaes, Konrad Kuijken, Julian Merten, Emanuella PudduMario Radovich, Qiao Wang

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

This paper is the first of a series of papers constraining cosmological parameters with weak lensing peak statistics using ˜ 450 deg2 of imaging data from the Kilo Degree Survey (KiDS-450). We measure high signal-to-noise ratio (SNR: ν) weak lensing convergence peaks in the range of 3 <ν <5, and employ theoretical models to derive expected values. These models are validated using a suite of simulations. We take into account two major systematic effects, the boost factor and the effect of baryons on the mass-concentration relation of dark matter haloes. In addition, we investigate the impacts of other potential astrophysical systematics including the projection effects of large-scale structures, intrinsic galaxy alignments, as well as residual measurement uncertainties in the shear and redshift calibration. Assuming a flat Λ cold dark matter model, we find constraints for S_8=σ _8(Ω _m/0.3)^{0.5}=0.746^{+0.046}_{-0.107} according to the degeneracy direction of the cosmic shear analysis and Σ _8=σ _8(Ω _m/0.3)^{0.38}=0.696^{+0.048}_{-0.050} based on the derived degeneracy direction of our high-SNR peak statistics. The difference between the power index of S8 and in Σ8 indicates that combining cosmic shear with peak statistics has the potential to break the degeneracy in σ8 and Ωm. Our results are consistent with the cosmic shear tomographic correlation analysis of the same data set and ˜2σ lower than the Planck 2016 results.
Original languageEnglish
Pages (from-to)1116-1134
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number1
DOIs
Publication statusPublished - 1 Nov 2017

Keywords / Materials (for Non-textual outputs)

  • gravitational lensing: weak
  • dark matter
  • large-scale structure of Universe

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