Consistent cosmic shear in the face of systematics: a B-mode analysis of KiDS-450, DES-SV and CFHTLenS

被引:33
作者
Asgari, Marika [1 ]
Heymans, Catherine [1 ]
Hildebrandt, Hendrik [2 ]
Miller, Lance [3 ]
Schneider, Peter [2 ]
Amon, Alexandra [1 ,4 ,5 ]
Choi, Ami [6 ]
Erben, Thomas [2 ]
Georgiou, Christos [7 ]
Harnois-Deraps, Joachim [1 ]
Kuijken, Konrad [7 ]
机构
[1] Univ Edinburgh, Inst Astron, Royal Observ, Scottish Univ Phys Alliance, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
[2] Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
[3] Univ Oxford, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
[4] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA
[5] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
[6] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA
[7] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
基金
美国国家科学基金会; 欧洲研究理事会; 加拿大创新基金会; 英国科学技术设施理事会;
关键词
gravitational lensing: weak; methods: data analysis; methods: statistical; surveys; cosmology: observations; COSMOLOGICAL PARAMETER CONSTRAINTS; WEAK LENSING SURVEYS; DARK ENERGY SURVEY; PHOTOMETRIC REDSHIFTS; POWER SPECTRUM; 2-POINT STATISTICS; COVARIANCE; GALAXIES; ANISOTROPIES; SIMULATIONS;
D O I
10.1051/0004-6361/201834379
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyse three public cosmic shear surveys; the Kilo-Degree Survey (KiDS-450), the Dark Energy Survey (DES-SV) and the Canada France Hawaii Telescope Lensing Survey (CFHTLenS). Adopting the "COSEBIs" statistic to cleanly and completely separate the lensing E-modes from the non-lensing B-modes, we detect B-modes in KiDS-450 and CFHTLenS at the level of similar to 2.7 sigma. For DES-SV we detect B-modes at the level of 2.8 sigma in a non-tomographic analysis, increasing to a 5.5 sigma B-mode detection in a tomographic analysis. In order to understand the origin of these detected B-modes we measure the B-mode signature of a range of different simulated systematics including PSF leakage, random but correlated PSF modelling errors, camera-based additive shear bias and photometric redshift selection bias. We show that any correlation between photometric-noise and the relative orientation of the galaxy to the point-spread-function leads to an ellipticity selection bias in tomographic analyses. This work therefore introduces a new systematic for future lensing surveys to consider. We find that the B-modes in DES-SV appear similar to a superposition of the B-mode signatures from all of the systematics simulated. The KiDS-450 and CFHTLenS B-mode measurements show features that are consistent with a repeating additive shear bias.
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页数:33
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