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Weak Lensing Reconstruction by Counting Galaxies: Improvement with DES Y3 Galaxies

Dec 1, 2024
14 pages
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Abstract: (arXiv)
In \citep{Qin+}, we attempted to reconstruct the weak lensing convergence map κ^\hat{\kappa} from cosmic magnification by linearly weighting the DECaLS galaxy overdensities in different magnitude bins of grzgrz photometry bands. The κ^\hat{\kappa} map is correlated with cosmic shear at 20-σ\sigma significance. However, the low galaxy number density in the DECaLS survey prohibits the measurement of κ^\hat{\kappa} auto-correlation. In this paper, we apply the reconstruction method to the Dark Energy Survey Year 3 (DES Y3) galaxies from the DES Data Release 2 (DR2). With greater survey depth and higher galaxy number density, convergence-shear cross-correlation signals are detected with S/N≈9,16,20S/N\approx 9,16,20 at 0.4<zκ<0.6,0.6<zκ<0.80.4<z_\kappa<0.6,0.6<z_\kappa<0.8 and 0.8<zκ<1.00.8<z_\kappa<1.0 respectively. More remarkably, the κ^−κ^\hat{\kappa}-\hat{\kappa} correlations of the 0.4<zκ<0.60.4<z_\kappa<0.6 and 0.6<zκ<0.80.6<z_\kappa<0.8 bins show reasonably good agreement with predictions based on theoretical interpretation of κ^−γ\hat{\kappa}-\gamma measurement. This result takes a step further towards the cosmological application of our lensing reconstruction method.
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  • 14 pages, 10 figures
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