Journal Article

Bulk flow and shear moments of the SFI++ survey

Hume A. Feldman and Richard Watkins

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 387, issue 2, pages 825-829
Published in print June 2008 | ISSN: 0035-8711
Published online May 2008 | e-ISSN: 1365-2966 | DOI:
Bulk flow and shear moments of the SFI++ survey

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We find the nine bulk flow and shear moments from the SFI++ survey, as well as for subsamples of group and field galaxies. We constrain the velocity power spectrum shape parameter Γ in linear theory using these moments. A likelihood function for Γ was found after marginalizing over the power spectrum amplitude σ8Ω0.6m using constraints obtained from comparisons between redshift surveys and peculiar velocity data. We have estimated the velocity noise σ* from the data since without it our results may be biased. We also performed a statistical analysis of the difference between the field and group catalogues and found that the results from each reflect the same underlying large-scale flows. We found that we can constrain the power spectrum shape parameter to be Γ= 0.15+0.18−0.08 for the groups catalogue and Γ= 0.09+0.04−0.04 for the field galaxy catalogue in fair agreement with the value from Wilkinson Microwave Anisotropy Probe.

Keywords: galaxies: kinematics and dynamics; galaxies: statistics; cosmology: observations; cosmology: theory; distance scale; large-scale structure of Universe

Journal Article.  3536 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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