Gravity and Non-gravity Modes in the VIRMOS-DESCART Weak Lensing Survey

Details Gravity and Non-gravity Modes in the VIRMOS-DESCART Weak Lensing Survey Gravity and Non-gravity Modes in the VIRMOS-DESCART Weak Lensing Survey

2001-09-12

arxiv.org/abs/astro-ph/0109182v2

Astronomy and Astrophysics

Astrophysics

accepted version, minor changes, 18 pages including 6 figures

Scientific paper

10.1086/338576

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

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