2008/02/29 by Hume A. Feldman, Richard Watkins · 1 citation
Physics and Astronomy · #Amplitude #Anisotropy #Astronomy and Astrophysical Research #Cosmic microwave background #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Galaxy #Peculiar velocity #Redshift #Redshift survey #Shear (geology) #Spectral density #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2008.13288.x
published as Mon.Not.Roy.Astron.Soc.387:825-829,2008
openalex publication_date 2008/05/09 · arxiv created 2008/06/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.