2024/12/01 by Jian Qin, Qin, Jian, Zhang, Pengjie +10 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Adaptive optics and wavefront sensing
paper · pdf · doi:10.48550/arxiv.2412.00829
In \citepQin+, we attempted to reconstruct the weak lensing convergence map κ from cosmic magnification by linearly weighting the DECaLS galaxy overdensities in different magnitude bins of grz photometry bands. The κ map is correlated with cosmic shear at 20-σ significance. However, the low galaxy number density in the DECaLS survey prohibits the measurement of κ 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≈ 9,16,20 at 0.4