Observational biases in flux magnification measurements

Understand

Flux magnification is an interesting complement to shear-based lensing measurements, especially at high redshift where sources are harder to resolve.

• One measures either changes in the source density (magnification bias) or in the shape of the flux distribution (e.g.
• magnitude-shift).
• The interpretation of these measurements relies on theoretical estimates of how the observables change under magnification.