Lensing signals in the Hubble Ultra-Deep Field using all 2nd order shape deformations
arXiv:astro-ph/0607007 · doi:10.1086/522819
Abstract
The long exposure times of the HST Ultra-Deep Field plus the use of an empirically derived position-dependent PSF, have enabled us to measure a cardioid/displacement distortion map coefficient as well as improving upon the sextupole map coefficient. We confirmed that curved background galaxies are clumped on the same angular scale as found in the HST Deep Field North. The new cardioid/displacement map coefficient is strongly correlated to a product of the sextupole and quadrupole coefficients. One would expect to see such a correlation from fits to background galaxies with quadrupole and sextupole moments. Events that depart from this correlation are expected to arise from map coefficient changes due to lensing, and several galaxy subsets selected using this criteria are indeed clumped.
9 pages, 16 figures, submitted to ApJ letters
References in corpus (3)
Cited by in corpus (14)
- Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing
- Limitations of model fitting methods for lensing shear estimation
- A new tool for image analysis based on Chebyshev rational functions: CHEF functions
- Gravitational lensing formalism in a curved arc basis: A continuous description of observables and degeneracies from the weak to the strong lensing regime
- Gravitational Flexion by Elliptical Dark Matter Haloes
- On the validity of the Born approximation for weak cosmic flexions
- Shape, shear & flexion: An analytic flexion formalism for realistic mass profiles
- Flexion measurement in simulations of Hubble Space Telescope data
- Shear-flexion cross-talk in weak-lensing measurements
- Analytical shear and flexion of Einasto dark matter haloes
- Shape, shear and flexion II - Quantifying the flexion formalism for extended sources with the ray-bundle method
- New highly precise weak gravitational lensing flexions measurement method based on ERA method
- Exotic Image Formation in Strong Gravitational Lensing by Clusters of Galaxies -- III: Statistics with HUDF
- A short review on joint weak and strong cluster lens-mass reconstruction