Testing the Minimum Variance Method for Estimating Large Scale Velocity Moments

Details Testing the Minimum Variance Method for Estimating Large Scale Velocity Moments Testing the Minimum Variance Method for Estimating Large Scale Velocity Moments

2011-12-30

arxiv.org/abs/1201.0128v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 5 colored figures, 1 table

Scientific paper

The estimation and analysis of large-scale bulk flow moments of peculiar velocity surveys is complicated by non-spherical survey geometry, the non-uniform sampling of the matter velocity field by the survey objects, and the typically large measurement errors of the measured line-of-sight velocities. Previously we have developed an optimal "minimum variance" (MV) weighting scheme for using peculiar velocity data to estimate bulk flow moments for idealized dense and isotropic surveys with Gaussian radial distributions that avoids many of these complications. These moments are designed to be easy to interpret and are comparable between surveys. In this paper, we test the robustness of our MV estimators using numerical simulations. Using MV weights, we estimate the underlying bulk flow moments for DEEP, SFI++ and COMPOSITE mock catalogues extracted from the LasDamas and the Horizon Run numerical simulations and compare these estimates to the true moments calculated directly from the simulation boxes. We show that the MV estimators are negligibly affected by nonlinear flows; in particular they are unbiased and have errors that are consistent with predictions from linear theory.

Affiliated with

Also associated with

No associations

Rating

Testing the Minimum Variance Method for Estimating Large Scale Velocity Moments 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 the Minimum Variance Method for Estimating Large Scale Velocity Moments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing the Minimum Variance Method for Estimating Large Scale Velocity Moments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-335501