Lensing signals in the Hubble Ultra-Deep Field using all 2nd order shape deformations

Details Lensing signals in the Hubble Ultra-Deep Field using all 2nd order shape deformations Lensing signals in the Hubble Ultra-Deep Field using all 2nd order shape deformations

2006-07-02

arxiv.org/abs/astro-ph/0607007v1

Astrophys.J.671:1182-1195,2007

Astronomy and Astrophysics

Astrophysics

9 pages, 16 figures, submitted to ApJ letters

Scientific paper

10.1086/522819

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.

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