Are recent peculiar velocity surveys consistent?

Conference item

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.

Authors: Hudson, MJ; Smith, RJ; Lucey, JR; Schlegel, DJ; Davies, RL

• Publication status: Published
• Peer review status: Reviewed (other)
• Publisher: Astronomical Society of the Pacific
• Journal: Cosmic Flows 1999: Towards an Understanding of Large-Scale Structures
• Series: Astronomical Society of the Pacific Conference Series
• Publication date: 1999-09-30
• ISBN: 1583810285
• Keywords: SBTMR