Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-20
Astron.Astrophys. 409 (2003) 411-421
Astronomy and Astrophysics
Astrophysics
11 pages, 6 figures, submitted to Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20030406
Via the magnification bias, gravitational lensing by large-scale structures causes angular cross-correlations between distant quasars and foreground galaxies on angular scales of arc minutes and above. We investigate the three-point cross-correlation between quasars and galaxy pairs measurable via the second moment of the galaxy counts around quasars and show that it reaches the level of a few per cent on angular scales near one arc minute. Combining two- and three-point correlations, a skewness parameter can be defined which is shown to be virtually independent on the shape and normalisation of the dark-matter power spectrum. If the galaxy bias is linear and deterministic, the skewness depends on the cosmic matter density parameter Omega_0 only; otherwise, it can be used to probe the linearity and stochasticity of the bias. We finally estimate the signal-to-noise ratio of a skewness determination and find that around twenty thousand distant quasars e.g. from the Sloan Digital Sky Survey should suffice for a direct measurement of Omega_0.
Bartelmann Matthias
Mellier Yannick
Menard Brice
No associations
LandOfFree
Measuring Omega_0 with higher-order Quasar-Galaxy Correlations induced by Weak Lensing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Measuring Omega_0 with higher-order Quasar-Galaxy Correlations induced by Weak Lensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring Omega_0 with higher-order Quasar-Galaxy Correlations induced by Weak Lensing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-464985