Journal
ASTRONOMY & ASTROPHYSICS
Volume 633, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201834878
Keywords
cosmology: observations; gravitational lensing: weak; galaxies: photometry; surveys
Categories
Funding
- ESO Telescopes at the La Silla Paranal Observatory [177.A-3016, 177.A-3017, 177.A-3018, 179.A-2004, 298.A-5015]
- European Research Council [647112, 693024, 670193, 770935]
- Deutsche Forschungsgemeinschaft [Hi 1495/2-1, Hi 1495/5-1]
- Deutsche Forschungsgemeinschaft (TR33 'The Dark Universe' program)
- Alexander von Humboldt Foundation
- STFC [ST/N000919/1]
- NWO [621.016.402, 614.001.451, 639.043.512]
- World Premier International Research Center Initiative, MEXT, Japan
- NASA [15-WFIRST15-0008]
- EU [797794, 702971]
- NSF/AURA [1258333]
- DoE/SLAC [DE-AC02-76SF00515]
- DIRAC Institute
- Beecroft Trust
- DiRAC Data Intensive service at Leicester (STFC) [ST/K000373/1, ST/R002363/1, ST/R001014/1]
- Max Planck Society
- NSF [PHY-1607611]
- STFC [ST/P002447/1, ST/R000972/1, ST/P000673/1, ST/J005673/1, ST/R001049/1, ST/M007618/1, ST/T00049X/1, ST/V002635/1, ST/R000832/1, ST/N000919/1, ST/K00333X/1, ST/R00689X/1, ST/T001372/1, ST/S002529/1, ST/M007065/1, ST/M007006/1, ST/S003762/1, ST/R001006/1, ST/M007073/1, ST/M006948/1, ST/V002376/1, ST/V002384/1, ST/P003400/1, ST/R001014/1, ST/T001569/1, ST/T001348/1, ST/L000636/1, ST/T001550/1, ST/M006530/1] Funding Source: UKRI
- Marie Curie Actions (MSCA) [702971] Funding Source: Marie Curie Actions (MSCA)
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We present a tomographic cosmic shear analysis of the Kilo-Degree Survey (KiDS) combined with the VISTA Kilo-Degree Infrared Galaxy Survey. This is the first time that a full optical to near-infrared data set has been used for a wide-field cosmological weak lensing experiment. This unprecedented data, spanning 450 deg(2), allows us to significantly improve the estimation of photometric redshifts, such that we are able to include robustly higher-redshift sources for the lensing measurement, and - most importantly - to solidify our knowledge of the redshift distributions of the sources. Based on a flat Lambda CDM model we find S-8 equivalent to sigma(8) root Omega(m)/0.3 = 0:737(-0.036)(+0.040) in a blind analysis from cosmic shear alone. The tension between KiDS cosmic shear and the Planck-Legacy CMB measurements remains in this systematically more robust analysis, with S-8 differing by 2.3 sigma. This result is insensitive to changes in the priors on nuisance parameters for intrinsic alignment, baryon feedback, and neutrino mass. KiDS shear measurements are calibrated with a new, more realistic set of image simulations and no significant B-modes are detected in the survey, indicating that systematic errors are under control. When calibrating our redshift distributions by assuming the 30-band COSMOS-2015 photometric redshifts are correct (following the Dark Energy Survey and the Hyper Suprime-Cam Survey), we find the tension with Planck is alleviated. The robust determination of source redshift distributions remains one of the most challenging aspects for future cosmic shear surveys.
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