Papers › Cosmological constraints from HSC Y1 lensing convergence PDF
Cosmological constraints from HSC Y1 lensing convergence PDF
Leander Thiele, Gabriela A. Marques, Jia Liu, Masato Shirasaki
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We utilize the probability distribution function (PDF) of normalized convergence maps reconstructed from the Subaru Hyper Suprime-Cam (HSC) Y1 shear catalogue, in combination with the power spectrum, to measure the matter clustering amplitude S₈=σ₈√(Ωₘ/0.3). The large-scale structure's statistical properties are incompletely described by the traditional two-point statistics, motivating our investigation of the PDF -- a complementary higher-order statistic. By defining the PDF over the standard deviation-normalized convergence map we are able to isolate the non-Gaussian information. We use tailored simulations to compress the data vector and construct a likelihood approximation. We mitigate the impact of survey and astrophysical systematics with cuts on smoothing scales, redshift bins, and data vectors. We find S₈=0.860^(+0.066)_(-0.109) from the PDF alone and S₈=0.798^(+0.029)_(-0.042) from the combination of PDF and power spectrum (68% CL). The PDF improves the power spectrum-only constraint by about 10%.
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