Weak gravitational lensing measurements of Abell 2744 using JWST and shear measurement algorithm pyRRG-JWST
arxiv(2024)
摘要
We update the publicly available weak lensing shear measurement algorithm
pyRRG for the James Webb Space Telescope, and apply it to UNCOVER DR1 imaging
of galaxy cluster Abell 2744. At short wavelengths (< 2.5μm), shear
measurements are consistent between independent observations through different
JWST bandpasses, and calibrated within 1.5
Telescope. At longer wavelengths, shear is underestimated by 5
to coarser pixellisation. We model the spatially varying Point Spread Function
(PSF) using WebbPSF, whose moments are within 0.05 of real stars near the
centre of the mosaic, where there are sufficient stars to also generate an
empirical model. We measure shear from up to 162 galaxies arcminute^2 to
derive a map of (dark plus baryonic) mass with 12 arcsecond (55 kpc) spatial
resolution. All code, catalogues and maps are available from
https://github.com/davidharvey1986/pyRRG.
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