Are Recent Peculiar Velocity Surveys Consistent?
摘要
We compare the bulk flow of the SMAC sample to the predictions of popular cosmological models and to other recent large-scale peculiar velocity surveys. Both analyses account for aliasing of small-scale power due to the sparse and non-uniform sampling of the surveys. We conclude that the SMAC bulk flow is in marginal conflict with flat COBE-normalized Lambda-CDM models which fit the cluster abundance constraint. However, power spectra which are steeper shortward of the peak are consistent with all of the above constraints. When recent large-scale peculiar velocity surveys are compared, we conclude that all measured bulk flows (with the possible exception of that of Lauer & Postman) are consistent with each other given the errors, provided the latter allow for `cosmic covariance'. A rough estimate of the mean bulk flow of all surveys (except Lauer & Postman) is ~400 km/s towards l=270, b=0.
引用
@article{arxiv.astro-ph/9909307,
title = {Are Recent Peculiar Velocity Surveys Consistent?},
author = {Michael J. Hudson and Russell J. Smith and John R. Lucey and David J. Schlegel and Roger L. Davies},
journal= {arXiv preprint arXiv:astro-ph/9909307},
year = {2007}
}
备注
8 pages, 3 figures. To appear in Proceedings of the Cosmic Flows Workshop, Victoria, B. C., Canada, July 1999, eds. S. Courteau, M. Strauss, and J. Willick