Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-31
Astronomy and Astrophysics
Astrophysics
12 pages, 7 figures, version accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2008.14211.x
Observations of redshift-space distortions in spectroscopic galaxy surveys offer an attractive method for observing the build-up of cosmological structure. In this paper we develop and test a new statistic based on anisotropies in the measured galaxy power spectrum, which is independent of galaxy bias and matches the matter power spectrum shape on large scales. The amplitude provides a constraint on the derivative of the linear growth rate through f.sigma_8. This demonstrates that spectroscopic galaxy surveys offer many of the same advantages as weak lensing surveys, in that they both use galaxies as test particles to probe all matter in the Universe. They are complementary as redshift-space distortions probe non-relativistic velocities and therefore the temporal metric perturbations, while weak lensing tests the sum of the temporal and spatial metric perturbations. The degree to which our estimator can be pushed into the non-linear regime is considered and we show that a simple Gaussian damping model, similar to that previously used to model the behaviour of the power spectrum on very small scales, can also model the quasi-linear behaviour of our estimator. This enhances the information that can be extracted from surveys for LCDM models.
Percival Will J.
White Martin
No associations
LandOfFree
Testing cosmological structure formation using redshift-space distortions 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 Testing cosmological structure formation using redshift-space distortions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing cosmological structure formation using redshift-space distortions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-643009