Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 465, Issue 2, Pages 1454-1498Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw2805
Keywords
gravitational lensing: weak; surveys; galaxies: photometry; cosmology: observations
Categories
Funding
- DFG (Emmy Noether grants) [Hi 1495/2-1, Si 1769/1-1, TR33]
- BMWi via DLR [50QE1103]
- Alexander von Humboldt Foundation
- ERC [240185, 279396, 647112, 670193]
- European Commission [656869, 627288]
- ERDF [ERDF-080]
- STFC [ST/L00285X/1, ST/J004421/1]
- NWO [614.001.103, 614.061.610, 022.003.013, 614.001.451]
- NOVA
- Target program
- Samenwerkingsverband Noord Nederland
- European fund for regional development
- Dutch Ministry of economic affairs
- Pieken in de Delta
- Province of Groningen
- Province of Drenthe
- NSERC
- CIfAR
- ARC
- European Research Council (ERC) [279396, 240185, 670193, 647112] Funding Source: European Research Council (ERC)
- Science and Technology Facilities Council [ST/H002456/1, ST/N000919/1] Funding Source: researchfish
- STFC [ST/N000919/1, ST/M001334/1, ST/H002456/1, ST/J004421/1, ST/J004421/2] Funding Source: UKRI
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We present cosmological parameter constraints from a tomographic weak gravitational lensing analysis of similar to 450 deg(2) of imaging data from the Kilo Degree Survey (KiDS). For a flat Lambda cold dark matter (Lambda CDM) cosmology with a prior on H-0 that encompasses the most recent direct measurements, we find S-8 = sigma(8)root Omega(m)/0.3 = 0.745 +/- 0.039. This result is in good agreement with other low-redshift probes of large-scale structure, including recent cosmic shear results, along with pre-Planck cosmic microwave background constraints. A 2.3 sigma tension in S-8 and 'substantial discordance' in the full parameter space is found with respect to the Planck 2015 results. We use shear measurements for nearly 15 million galaxies, determined with a new improved 'self-calibrating' version of lensFIT validated using an extensive suite of image simulations. Four-band ugri photometric redshifts are calibrated directly with deep spectroscopic surveys. The redshift calibration is confirmed using two independent techniques based on angular cross-correlations and the properties of the photometric redshift probability distributions. Our covariance matrix is determined using an analytical approach, verified numerically with large mock galaxy catalogues. We account for uncertainties in the modelling of intrinsic galaxy alignments and the impact of baryon feedback on the shape of the nonlinear matter power spectrum, in addition to the small residual uncertainties in the shear and redshift calibration. The cosmology analysis was performed blind. Our high-level data products, including shear correlation functions, covariance matrices, redshift distributions, and Monte Carlo Markov chains are available at http://kids.strw.leidenuniv.nl.
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