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Gravity and Non-gravity Modes in the VIRMOS-DESCART Weak Lensing Survey | | Ue-Li Pen
; Ludovic van Waerbeke
; Yannick Mellier
; | | Date: |
12 Sep 2001 | | Subject: | astro-ph | | Abstract: | We analyze the weak lensing data of the VIRMOS imaging survey using projections (called E and B-modes) of the two independents observed correlation functions. The E-mode contains all the lensing signal, while noise and systematics contribute equally to the E and B modes provided that intrinsic alignment is negligible. The mode separation allows a measurement of the signal with a sqrt{2} smaller error bars, and a separate channel to test for systematic errors. We apply various transformations, including a spherical harmonic space power spectrum C^E_l and C^B_l, which provides a direct measurement of the projected dark matter distribution for 500 | | Source: | arXiv, astro-ph/0109182 | | Services: | Forum | Review | PDF | Favorites | |
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