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http://hdl.handle.net/20.500.12386/29093
Titolo: | KiDS-450: cosmological constraints from weak lensing peak statistics - I. Inference from analytical prediction of high signal-to-noise ratio convergence peaks | Autori: | 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 |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 474 | Fascicolo: | 1 | Da pagina:: | 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 |
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