Measuring Omega/b with weak lensing

Details Measuring Omega/b with weak lensing Measuring Omega/b with weak lensing

1999-09-04

arxiv.org/abs/astro-ph/9909082v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures, uses macro emulateapj.sty. To appear in ApJLetters

Scientific paper

10.1086/312329

A correlation between the surface density of foreground galaxies tracing the Large Scale Structure and the position of distant galaxies and quasars is expected from the magnification bias effect (Canizares 1981). We show that this foreground--background correlation function w_{fb} can be used as a straightforward and almost model-free method to measure the cosmological ratio Omega/b. For samples with appropriate redshift distributions, w_{fb} is proportional to Omega, where delta and g are respectively the foreground dark matter and galaxy surface density fluctuations. Therefore, Omega/b is proportional to the ratio w_{fb}/w, where w is equivalent to , the foreground galaxy angular two-point correlation function, b is the biasing factor, and the proportionality factor is independent of the dark matter power spectrum. Simple estimations show that the application of this method to the galaxy and quasar samples generated by the upcoming Sloan Sky Digital Survey will achieve a highly accurate and well resolved measurement of the ratio Omega/b.

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