Weak Lensing

GalSim was originally built for the Great03 weak lensing challenge. As such, it includes various classes and routines for accurately handling and constructing weak lensing shear and magnification.

• The Shear class is our basic object for handling and manipulating shear values.

• PowerSpectrum can be used to generate shear and convergence fields according to an input power spectrum function.

• NFWHalo can generate tangential shear profiles around an NFW halo mass profile.

• galsim.pse.PowerSpectrumEstimator can be used to estimate a shear power spectrum from gridded shear values.

• The Shear class
  • Shear
  • _Shear()
• Power Spectrum Shears
  • PowerSpectrum
  • PowerSpectrumRealizer
  • theoryToObserved()
• NFW Halo Shears
  • NFWHalo
  • Cosmology
• Power Spectrum Estimation
  • PowerSpectrumEstimator