학술논문
DESI and DECaLS (D&D): galaxy–galaxy lensing measurements with 1 per cent survey and its forecast
Document Type
article
Author
Yao, Ji; Shan, Huanyuan; Zhang, Pengjie; Jullo, Eric; Kneib, Jean-Paul; Yu, Yu; Zu, Ying; Brooks, David; de la Macorra, Axel; Doel, Peter; Font-Ribera, Andreu; Gontcho, Satya Gontcho A; Kisner, Theodore; Landriau, Martin; Meisner, Aaron; Miquel, Ramon; Nie, Jundan; Poppett, Claire; Prada, Francisco; Schubnell, Michael; Magana, Mariana Vargas; Zhou, Zhimin
Source
Monthly Notices of the Royal Astronomical Society. 524(4)
Subject
Language
Abstract
The shear measurement from the Dark Energy Camera Legacy Survey (DECaLS) provides an excellent opportunity for galaxy-galaxy lensing study with the Dark Energy Spectroscopic Instrument (DESI) galaxies, given the large (∼9000 deg2) sky overlap. We explore this potential by combining the DESI 1 per cent survey and DECaLS Data Release 8 (DR8). With ∼106 deg2 sky overlap, we achieve significant detection of galaxy-galaxy lensing for Bright Galaxy Survey (BGS) and luminous red galaxy (LRG) as lenses. Scaled to the full BGS sample, we expect the statistical errors to improve from to a promising level of at. This brings stronger requirements for future systematics control. To fully realize such potential, we need to control the residual multiplicative shear bias |m| < 0.006 and the bias in the mean redshift |Δz| < 0.008, requiring the introduced bias in the measurement is