A Method for Weak Lensing Observations

  title={A Method for Weak Lensing Observations},
  author={Nick Kaiser and Gordon Squires and Tom Broadhurst},
  journal={The Astrophysical Journal},
We develop and test a method for measuring the gravitational lensing induced distortion of faint background galaxies. We first describe how we locate the galaxies and measure a 2-component `polarisation' or ellipticity statistic $e_\alpha$ whose expectation value should be proportional to the gravitational shear $\gamma_\alpha$. We then show that an anisotropic instrumental psf perturbs the polarisation by $\delta e_\alpha = P^s_{\alpha\beta} p_\beta$, where $p_\alpha$ is a measure of the psf… 
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