TY - JOUR
T1 - KiDS+VIKING-450
T2 - Cosmic shear tomography with optical and infrared data
AU - Hildebrandt, H.
AU - Köhlinger, F.
AU - Van Den Busch, J. L.
AU - Joachimi, B.
AU - Heymans, C.
AU - Kannawadi, A.
AU - Wright, A. H.
AU - Asgari, M.
AU - Blake, C.
AU - Hoekstra, H.
AU - Joudaki, S.
AU - Kuijken, K.
AU - Miller, L.
AU - Morrison, C. B.
AU - Tröster, T.
AU - Amon, A.
AU - Archidiacono, M.
AU - Brieden, S.
AU - Choi, A.
AU - De Jong, J. T.A.
AU - Erben, T.
AU - Giblin, B.
AU - Mead, A.
AU - Peacock, J. A.
AU - Radovich, M.
AU - Schneider, P.
AU - Sifón, C.
AU - Tewes, M.
N1 - Funding Information:
Acknowledgements. We thank Matthias Bartelmann for being our external blinder, revealing which of the three redshift distributions analysed was the true unblinded redshift distribution at the end of this study. We would like to thank George Efstathiou for valuable comments on the first version of the manuscript, some of which were incorporated in the revised version. We thank Julien Lesgourges, Thejs Brinkmann, Thomas Tram, and Benjamin Audren for developing the class and MontePython codes and Anthony Lewis for developing getdist. We are grateful to the HSC team for providing their likelihood chain to us and to the zCOSMOS team to give us early access to additional deep spec-z that were not availale in the public domain. We are indebted to the staff at ESO-Garching and ESO-Paranal for managing the observations at VST and VISTA that yielded the data presented here. Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programme IDs 177.A-3016, 177.A-3017, 177.A-3018, 179.A-2004, 298.A-5015, and on data products produced by the KiDS consortium. We acknowledge support from European Research Council grants 647112 (CH, MA, BG, AA), 693024 (SJ), 670193 (JP), and 770935 (HHi, JLvdB, AW), the Deutsche Forschungsgemein-schaft (HHi, CM, MT, grants Hi 1495/2-1 and Hi 1495/5-1 as well as the TR33 ‘The Dark Universe’ program), the Alexander von Humboldt Foundation (KK), the STFC (LM, grant ST/N000919/1), NWO (KK, JdJ, MB, HHo, research grants 621.016.402, 614.001.451 and 639.043.512), the World Premier International Research Center Initiative, MEXT, Japan (FK), NASA (AC, grant 15-WFIRST15-0008), the EU’s Horizon 2020 programme (TT, AM, Marie Curie grants 797794, 702971), NSF/AURA (CM, grant 1258333), DoE/SLAC (CM, grant DE-AC02-76SF00515), the DIRAC Institute (CM), the Beecroft Trust (SJ), and the DiRAC Data Intensive service at Leicester (STFC grants ST/K000373/1, ST/R002363/1, ST/R001014/1; SJ). CH acknowledges support from the Max Planck Society and the Alexander von Humboldt Foundation in the framework of the Max Planck-Humboldt Research Award endowed by the Federal Ministry of Education and Research. We are very grateful to the Lorentz Centre and ESO-Garching for hosting several team meetings. This work was performed in part at Aspen Center for Physics, which is supported by NSF grant PHY-1607611. Author Contributions: All authors contributed to the development and writing of this paper. The authorship list is given in three groups: the lead authors (HHi, FK, JLvdB, BJ, CH, AK, AW), followed by two alphabetical groups. The first alphabetical group includes those who are key contributors to both the scientific analysis and the data products. The second group covers those who have either made a significant contribution to the data products or to the scientific analysis.
Publisher Copyright:
© ESO 2020.
PY - 2020/1/1
Y1 - 2020/1/1
N2 - 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 deg2, 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 ΛCDM model we find S8 σ8 ωm/0.3 = 0.737+0.040-0.036 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 S8 differing by 2.3σ. 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.
AB - 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 deg2, 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 ΛCDM model we find S8 σ8 ωm/0.3 = 0.737+0.040-0.036 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 S8 differing by 2.3σ. 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.
KW - Cosmology: observations
KW - Galaxies: photometry
KW - Gravitational lensing: weak
KW - Surveys
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U2 - 10.1051/0004-6361/201834878
DO - 10.1051/0004-6361/201834878
M3 - Article
AN - SCOPUS:85088108503
SN - 0004-6361
VL - 633
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A69
ER -