Shear Measurement with Poorly Resolved Images

Abstract Weak lensing studies typically require excellent seeing conditions for the purpose of maximizing the number density of well-resolved galaxy images. It is interesting to ask to what extent the seeing size limits the usefulness of the astronomical images in weak lensing. In this work, we stud...

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Bibliographic Details
Published inThe Astronomical journal Vol. 164; no. 4; pp. 128 - 137
Main Authors Zhang, Jun, Liu, Cong, Vaquero, Pedro Alonso, Li, Hekun, Wang, Haoran, Shen, Zhi, Dong, Fuyu
Format Journal Article
LanguageEnglish
Published Madison The American Astronomical Society 01.10.2022
IOP Publishing
Subjects
Astronomy
Astronomy & Astrophysics
ASTRONOMY AND ASTROPHYSICS
Celestial bodies
Dark energy
Galaxies
Gravitational lensing
Gravitational lensing shear
Image resolution
Shear
Weak gravitational lensing
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Summary:Abstract Weak lensing studies typically require excellent seeing conditions for the purpose of maximizing the number density of well-resolved galaxy images. It is interesting to ask to what extent the seeing size limits the usefulness of the astronomical images in weak lensing. In this work, we study this issue with the data of the DECam Legacy Survey, which is a part of the target selection program for the Dark Energy Spectroscopic Instrument. Using the Fourier_Quad shear measurement pipeline, we demonstrate that images with relatively poor seeing conditions (∼1.″5) can still yield accurate shear estimators. We do not find any correlation between systematic shear error and the image resolution.
Bibliography:AAS39949
Galaxies and Cosmology
SC0007914; AC02-05CH1123; AST-0950945; 11621303; 11890691; 12073017
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
USDOE Office of Science (SC), High Energy Physics (HEP)
National Science Foundation (NSF)
National Natural Science Foundation of China (NSFC)
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ac84d8