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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29093
Title: KiDS-450: cosmological constraints from weak lensing peak statistics - I. Inference from analytical prediction of high signal-to-noise ratio convergence peaks
Authors: Shan, HuanYuan
Liu, Xiangkun
Hildebrandt, Hendrik
Pan, Chuzhong
Martinet, Nicolas
Fan, Zuhui
Schneider, Peter
Asgari, Marika
Harnois-Déraps, Joachim
Hoekstra, Henk
Wright, Angus
Dietrich, Jörg P.
Erben, Thomas
GETMAN, FEDOR 
GRADO, ANIELLO 
Heymans, Catherine
Klaes, Dominik
Kuijken, Konrad
MERTEN, JULIAN 
PUDDU, Emanuella Anna 
RADOVICH, MARIO 
Wang, Qiao
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 474
Issue: 1
First Page: 1116
Abstract: This paper is the first of a series of papers constraining cosmological parameters with weak lensing peak statistics using ∼ 450 deg<SUP>2</SUP> 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 S<SUB>8</SUB> and in Σ<SUB>8</SUB> indicates that combining cosmic shear with peak statistics has the potential to break the degeneracy in σ<SUB>8</SUB> and Ω<SUB>m</SUB>. Our results are consistent with the cosmic shear tomographic correlation analysis of the same data set and ∼2σ lower than the Planck 2016 results.
URI: http://hdl.handle.net/20.500.12386/29093
URL: http://arxiv.org/abs/1709.07651v2
https://academic.oup.com/mnras/article-abstract/474/1/1116/4584476?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2837
Bibcode ADS: 2018MNRAS.474.1116S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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