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Analytical noise bias correction for precise weak lensing shear inference

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Noise bias is a significant source of systematic error in weak gravitational lensing measurements that must be corrected to satisfy the stringent standards of modern imaging surveys in the era of precision cosmology. This paper reviews the analytical noise bias correction method and provides analytical derivations demonstrating that we can recover shear to its second order using the ‘renoising’ noise bias correction approach introduced by METACALIBRATION. We implement this analytical noise bias correction within the AnaCal shear estimation framework and propose several enhancements to the noise bias correction algorithm. We evaluate the improved AnaCal using simulations designed to replicate Rubin Legacy Survey of Space and Time (LSST) imaging data. These simulations feature semi-realistic galaxies and stars, complete with representative distributions of magnitudes and Galactic spatial density. We conduct tests under various observational challenges, including cosmic rays, defective CCD columns, bright star saturation, bleed trails, and spatially variable point spread functions. Our results indicate a multiplicative bias in weak lensing shear recovery of less than a few tenths of a per cent, meeting LSST Dark Energy Science Collaboration requirements without requiring calibration from external image simulations. Additionally, our algorithm achieves rapid processing, handling one galaxy in less than a millisecond.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Carnegie Mellon University, Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The LSST Dark Energy Science Collaboration
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; SC0010118; SC0012704
OSTI ID:
2522036
Alternate ID(s):
OSTI ID: 2588002
Report Number(s):
BNL--227595-2025-JAAM
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 536; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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