Gravity and Nongravity Modes in the VIRMOS‐DESCART Weak‐Lensing Survey | Zendy

UeLi Pen | Zendy; Ludovic Van Waerbeke | Zendy; Y. Mellier | Zendy

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Gravity and Nongravity Modes in the VIRMOS‐DESCART Weak‐Lensing Survey

Author(s) -

UeLi Pen,

Ludovic Van Waerbeke,

Y. Mellier

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/338576

Subject(s) - physics , weak gravitational lensing , observable , gravitational lens , dark matter , spectral density , mode (computer interface) , noise (video) , signal (programming language) , astrophysics , statistical physics , galaxy , statistics , quantum mechanics , image (mathematics) , mathematics , redshift , artificial intelligence , computer science , programming language , operating system

We analyze the weak lensing data of the VIRMOS imaging survey usingprojections (called E and B-modes) of the two independents observed correlationfunctions. The E-mode contains all the lensing signal, while noise andsystematics contribute equally to the E and B modes provided that intrinsicalignment is negligible. The mode separation allows a measurement of the signalwith a \sqrt{2} smaller error bars, and a separate channel to test forsystematic errors. We apply various transformations, including a sphericalharmonic space power spectrum C^E_l and C^B_l, which provides a directmeasurement of the projected dark matter distribution for 500

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