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astro-ph.CO2011★ 20 cited
Shear-flexion cross-talk in weak-lensing measurements
Massimo Viola, Peter Melchior, Matthias Bartelmann
Gravitational flexion, caused by derivatives of the gravitational tidal field, is potentially important for the analysis of the dark-matter distribution in gravitational lenses, su…
astro-ph.CO2011★ 10 cited
Calibration biases in measurements of weak lensing
Matthias Bartelmann, Massimo Viola, Peter Melchior +1
As recently shown by Viola et al., the common (KSB) method for measuring weak gravitational shear creates a non-linear relation between the measured and the true shear of objects.…