KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing

被引：785

作者：

Hildebrandt, H. ^{[1
]}

Viola, M. ^{[2
]}

Heymans, C. ^{[3
]}

Joudaki, S. ^{[4
]}

Kuijken, K. ^{[2
]}

Blake, C. ^{[4
]}

Erben, T. ^{[1
]}

Joachimi, B. ^{[5
]}

Klaes, D. ^{[1
]}

Miller, L. ^{[6
]}

Morrison, C. B. ^{[1
]}

Nakajima, R. ^{[1
]}

Kleijn, G. Verdoes ^{[7
]}

Amon, A. ^{[3
]}

Choi, A. ^{[3
]}

Covone, G. ^{[8
]}

de Jong, J. T. A. ^{[2
]}

Dvornik, A. ^{[2
]}

Conti, I. Fenech ^{[9
,10
]}

Grado, A. ^{[11
]}

Harnois-Deraps, J. ^{[12
]}

Herbonnet, R. ^{[2
]}

Hoekstra, H. ^{[2
]}

Kohlinger, F. ^{[2
]}

McFarland, J. ^{[7
]}

Mead, A. ^{[12
]}

Merten, J. ^{[6
]}

Napolitano, N. ^{[11
]}

Peacock, J. A. ^{[3
]}

Radovich, M. ^{[13
]}

Schneider, P. ^{[1
]}

Simon, P. ^{[1
]}

Valentijn, E. A. ^{[7
]}

van den Busch, J. L. ^{[1
]}

van Uitert, E. ^{[5
]}

Van Waerbeke, L. ^{[12
]}

机构：

[1] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

[2] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands

[3] Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[4] Swinburne Univ Technol, Ctr Astrophys & Supercomp, POB 218, Hawthorn, Vic 3122, Australia

[5] UCL, Gower St, London WC1E 6BT, England

[6] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[7] Univ Groningen, Kapteyn Astron Inst, NL-9700 AD Groningen, Netherlands

[8] Univ Napile Federico II, Dept Phys, Via Cintia 1, I-80126 Naples, Italy

[9] Univ Malta, ISSA, MSD-2080 Msida, Malta

[10] Univ Malta, Dept Phys, MSD-2080 Msida, Malta

[11] INAF Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy

[12] Univ British Columbia, Dept Phys & Astron, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada

[13] INAF Osservatorio Astron Padova, Via Osservatorio 5, I-35122 Padua, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 465卷 / 02期

基金：

加拿大自然科学与工程研究理事会; 欧洲研究理事会;

关键词：

gravitational lensing: weak; surveys; galaxies: photometry; cosmology: observations; GALAXY SHAPE MEASUREMENT; CFHTLENS COSMIC SHEAR; ACCURATE HALO-MODEL; PHOTO-Z PERFORMANCE; 100 SQUARE DEGREES; DARK-ENERGY; REDSHIFT DISTRIBUTIONS; CROSS-CORRELATIONS; SYSTEMATIC-ERRORS; POWER SPECTRA;

D O I：

10.1093/mnras/stw2805

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1454 / 1498

页数：45