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Constraints on Cosmological Models from Cosmic Flows
M. J. Hudson et al.
University of Waterloo, Canada
Cosmic ows are the only probe of the large-scale mass power
spectrum available at low redshift. An important statistic is the
bulk ow of a peculiar velocity sample with respect to the Cos-
mic Microwave background. We compare the bulk ow of the
SMAC cluster 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 con-
clude that the SMAC bulk ow is in marginal con ict with at
COBE-normalized CDM models which t 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 con-
clude that all measured bulk ows (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 ow of all surveys (except Lauer
& Postman) is  400 km/s with respect to the Cosmic Microwave
Background.
Co-authors: R. J. Smith, J. R. Lucey, D. J. Schlegel,
R. L. Davies
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