Weak lensing mass-mapping from shear catalogs faces systematic challenges from survey masks and spatially varying noise. To overcome these issues and reconstruct unbiased convergence κ maps, we have constructed the AKRA (Accurate Kappa Reconstruction Algorithm), a prior-free and maximum-likelihood based analytical method. It has been validated for mock shear catalogs with a variety of survey masks. In this work, we present the first real-data application of the AKRA on the Subaru Hyper Suprime-Cam Year 1 (HSC Y1) data. We first validate AKRA using mock shear catalogs from the \texttt{Kun} simulation suite, with masks corresponding to the six HSC Y1 regions (\texttt{GAMA09H}, \texttt{GAMA15H}, \texttt{HECTOMAP}, \texttt{VVDS}, \texttt{WIDE12H}, and \texttt{XMMLSS}). The investigated statistics, including the lensing power spectrum, ⟨κ2⟩, ⟨κ3⟩, and the one-point probability distribution function of κ, are all unbiased. We then apply AKRA to the HSC Y1 shear catalog and provide reconstructed κ maps ready for subsequent scientific analyses.
Cite
@article{arxiv.2511.12488,
title = {The first AKRA mass map reconstruction from HSC Y1 data},
author = {Yuan Shi and Pengjie Zhang and Zhao Chen and Jian Qin and Li Cui and Furen Deng and Ji Yao},
journal= {arXiv preprint arXiv:2511.12488},
year = {2026}
}