DECADE+DES Y3 Weak Lensing Mass Map: A 13,000 deg$^2$ View of Cosmic Structure from 270 Million Galaxies
/ Authors
M. Gatti, D. Anbajagane, C. Chang, D. Bacon, J. Prat, M. Adamów, A. Alarcon, M. Becker, J. Carballo-Bello, N. Chicoine
and 30 more authors
C. Doux, A. Drlica-Wagner, P. Ferguson, D. Gruen, R. Gruendl, K. Herron, N. Jeffrey, D. James, A. Kov'acs, C. E. Mart'inez-V'azquez, P. Massana, S. Mau, J. McCullough, G. E. Medina, B. Mutlu-Pakdİl, N. E. D. Noël, A. Pace, G. Pollina, A. Riley, D. Sand, L. Secco, G. Stringfellow, D. Suson, 38 C.Y.Tan, R. Teixeira, E. Tollerud, M. Troxel, L. Whiteway, A. Zenteno, Z. Zhang
/ Abstract
We present the largest galaxy weak lensing mass map of the late-time Universe, reconstructed from 270 million galaxies in the DECADE and DES Year 3 datasets, covering 13,000 square degrees. We validate the map through systematic tests against observational conditions (depth, seeing, etc.), finding the map is statistically consistent with no contamination. The large area covered by the mass map makes it a well-suited tool for cosmological analyses, cross-correlation studies and the identification of large-scale structure features. We demonstrate its potential by detecting cosmic filaments directly from the mass map for the first time and validating them through their association with galaxy clusters selected using the Sunyaev-Zeldovich effect from Planck and ACT DR6.