2021/06/30 by Shutong Hou, Yu Yu, Pengjie Zhang · 6 citations
Mathematics · Physics and Astronomy · #Adaptive optics and wavefront sensing #Algorithm #Astronomy and Astrophysical Research #Astrophysics #Bin #Cluster analysis #Computer science #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitational lensing formalism #Magnification #Mathematics #Optics #Photometric redshift #Physics #Redshift #SIGNAL (programming language) #Statistics #Weak gravitational lensing #astro-ph.CO
paper · pdf · doi:10.1088/1674-4527/21/10/247
published in Research in Astronomy and Astrophysics 21(10), 247 (IOP Publishing) · 12 pages, 9 figures, match the published version in Research in Astronomy and Astrophysics
arxiv created 2021/10/22 · openalex publication_date 2021/11/01 · arxiv updated 2021/12/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Measuring weak lensing cosmic magnification signal is very challenging due to the overwhelming intrinsic clustering in the observed galaxy distribution. In this paper, we modify the Internal Linear Combination (ILC) method to reconstruct the lensing signal with an extra constraint to suppress the intrinsic clustering. To quantify the performance, we construct a realistic galaxy catalogue for the LSST-like photometric survey, covering 20 000 deg 2 with mean source redshift at z s ∼ 1. We find that the reconstruction performance depends on the width of the photo-z bin we choose. Due to the correlation between the lensing signal and the source galaxy distribution, the derived signal has smaller systematic bias but larger statistical uncertainty for a narrower photo-z bin. We conclude that the lensing signal reconstruction with the Modified ILC method is unbiased with a statistical uncertainty <5% for bin width Δ z P = 0.2.