Density and Velocity Fields from the PSCz Survey
Abstract
We present the results for the predicted density and peculiar velocity fields and the dipole from the PSCz survey of 15,000 IRAS galaxies over 84% of the sky. We find a significant component to the dipole arising between 6000 and 15,000 km/s, but no significant component from greater distances. The misalignment with the CMB is 20 degrees. The most remarkable feature of the PSCz model velocity field is a coherent large-scale flow along the baseline connecting Perseus-Pisces, the Local Supercluster, Great Attractor and the Shapley Concentration. We have measured the parameter beta using the amplitude of the dipole, bulk flow and point by point comparisons between the individual velocities of galaxies in the MarkIII and SFI datasets, and the large-scale clustering distortion in redshift space.All our results are consistent with beta = 0.6 +- 0.1.
Keywords
Cite
@article{arxiv.astro-ph/9909190,
title = {Density and Velocity Fields from the PSCz Survey},
author = {Will Saunders and Enzo Branchini and Luis Teodoro and Alan Heavens and Andy Taylor and Helen Valentine and Kenton D'Mellow and Seb Oliver and Oliver Keeble and Michael Rowan-Robinson and Jacob Sharpe and Steve Maddox and Richard McMahon and George Efstathiou and Will Sutherland and Helen Tadros and Bill Ballinger and Inga Schmolt and Carlos Frenk and Simon White},
journal= {arXiv preprint arXiv:astro-ph/9909190},
year = {2007}
}
Comments
8 pages, 8 figures. To appear in 'Towards an Understanding of Cosmic Flows', Victoria, July 1999, eds Courteau,S., Strauss,M., Willick,J. PASP