Résumé du preprint DAPNIA-04-233

Weak Lensing Mass Map Reconstruction
S. Pires, J.L. Starck, A. Réfrégier, S. Mathur
   Weak Gravitational Lensing provides a unique method to map directly the distribution of dark matter in the universe. The measurement of the 
distortions that lensing induces in the images of background galaxies, enables a direct measurement of the large-scale structures in the universe. 
This method is now widely used to map the mass of clusters and superclusters of galaxies.
   Ongoing efforts are made to improve the detection of cosmic shear on existing telescopes and future instruments dedicated to survey cosmic shear are being planned. Several methods are used to derive the lensing shear from the shapes of background galaxies. But the shear map obtained is always noisy. And when this shear map is converted into a map of the projected mass K, the mass map obtained is blurred by the noise.
   In this report, we have tested different methods of denoising in order to filter the noisy mass map.


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