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Are Recent Peculiar Velocity Surveys Consistent? | Michael J. Hudson
; Russell J. Smith
; John R. Lucey
; David J. Schlegel
; Roger L. Davies
; | Date: |
17 Sep 1999 | Subject: | astro-ph | Affiliation: | Victoria), Russell J. Smith (Durham), John R. Lucey (Durham), David J. Schlegel (Princeton), Roger L. Davies (Durham | Abstract: | 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. | Source: | arXiv, astro-ph/9909307 | Services: | Forum | Review | PDF | Favorites |
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