首页|Quasi-2D weak lensing cosmological constraints using the PDF-SYM method

Quasi-2D weak lensing cosmological constraints using the PDF-SYM method

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Cosmic shear statistics,such as the two-point correlation function(2PCF),can be evaluated with the PDF-SYM method instead of the traditional weighted-sum approach.It makes use of the full PDF information of the shear estimators,and does not require weightings on the shear estimators,which can in principle introduce additional systematic biases.This work presents our con-straints on S8 and Ωm from the shear-shear correlations using the PDF-SYM method.The data we use is from the z-band images of the Dark Energy Camera Legacy Survey(DECaLS),which covers about 10000 deg2 with more than 100 million galaxies.The shear catalog is produced by the Fourier_Quad method,and well tested on the real data itself with the field-distortion effect.Our main approach is called quasi-2D as we do use the photo-z information of each individual galaxy,but without dividing the galaxies into redshift bins.We mainly use galaxy pairs within the redshift interval between 0.2 and 1.3,and the angular range from 4.7 to 180 arcmin.Our analysis yields S8=0.762±0.026 and Ωm=0.234±0.075,with the baryon effects and the intrinsic alignments included.The results are robust against redshift uncertainties.We check the consistency of our results by deriving the cosmological constraints from auto-correlations of γ1 and γ2 separately,and find that they are consistent with each other,but the constraints from the γ1 component are much weaker than that from γ2 It implies a much worse data quality of γ1,which is likely due to additional shear uncertainties caused by CCD electronics(according to the survey strategy of DECaLS).We also perform a pure 2D analysis,which gives S8=0.81+0.03-0.04 and Ωm=0.25+0.06-0.05.Our findings demonstrate the potential of the PDF-SYM method for precision cosmology.

weak lensingshear-shear correlationscosmological parametersobservationsanalysis

Zhenjie Liu、Jun Zhang、Hekun Li、Zhi Shen、Cong Liu

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Department of Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

Shanghai Key Laboratory for Particle Physics and Cosmology,Shanghai 200240,China

Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinascience research grants from China Manned Space Project

2023YFA 16078002023YFA1607802116213031189069112073017CMS-CSST-2021-A01

2024

10.1007/s11433-024-2379-0

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(7)