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http://hdl.handle.net/20.500.12386/29649
Title: | KiDS-450: cosmological constraints from weak-lensing peak statistics - II: Inference from shear peaks using N-body simulations | Authors: | Martinet, Nicolas Schneider, Peter Hildebrandt, Hendrik Shan, HuanYuan Asgari, Marika Dietrich, Jörg P. Harnois-Déraps, Joachim Erben, Thomas GRADO, ANIELLO Heymans, Catherine Hoekstra, Henk Klaes, Dominik Kuijken, Konrad MERTEN, JULIAN Nakajima, Reiko |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 474 | Issue: | 1 | First Page: | 712 | Abstract: | We study the statistics of peaks in a weak-lensing reconstructed mass map of the first 450 deg<SUP>2</SUP> of the Kilo Degree Survey (KiDS-450). The map is computed with aperture masses directly applied to the shear field with an NFW-like compensated filter. We compare the peak statistics in the observations with that of simulations for various cosmologies to constrain the cosmological parameter S_8 = σ _8 √{Ω _m/0.3}, which probes the (Ω<SUB>m</SUB>, σ<SUB>8</SUB>) plane perpendicularly to its main degeneracy. We estimate S<SUB>8</SUB> = 0.750 ± 0.059, using peaks in the signal-to-noise range 0 ≤ S/N ≤ 4, and accounting for various systematics, such as multiplicative shear bias, mean redshift bias, baryon feedback, intrinsic alignment, and shear-position coupling. These constraints are ∼ 25 per cent tighter than the constraints from the high significance peaks alone (3 ≤ S/N ≤ 4) which typically trace single-massive haloes. This demonstrates the gain of information from low-S/N peaks. However, we find that including S/N < 0 peaks does not add further information. Our results are in good agreement with the tomographic shear two-point correlation function measurement in KiDS-450. Combining shear peaks with non-tomographic measurements of the shear two-point correlation functions yields a ∼20 per cent improvement in the uncertainty on S<SUB>8</SUB> compared to the shear two-point correlation functions alone, highlighting the great potential of peaks as a cosmological probe. | URI: | http://hdl.handle.net/20.500.12386/29649 | URL: | https://academic.oup.com/mnras/article-abstract/474/1/712/4566530 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx2793 | Bibcode ADS: | 2018MNRAS.474..712M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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1709.07678.pdf | 2.22 MB | Adobe PDF | View/Open | |
stx2793.pdf | PDF editoriale | 4.89 MB | Adobe PDF | View/Open |
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