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Constraining the Cosmic Mass Density from
the SBF Survey Peculiar Velocities
J.P. Blakeslee et al.
University of Durham, U.K.
The recently completed I-band Surface Brightness Fluctuations
(SBF) Survey of Galaxy Distances includes high-quality distance
measurements to nearly 300 early-type galaxies within 4000 km/s.
We compare the peculiar velocities observed in this survey with
those predicted from the galaxy density eld found in ux-limited
redshift surveys. Using linear gravitational instability theory and
the IRAS ux-limited redshift survey, we constrain the parameter

=
0:6
=b, where b is the linear biasing factor of the galaxies,
to be  = 0:44  0:08. The analysis also produces a value for
the thermal velocity dispersion of the non-cluster galaxies in this
sample, which we nd to be about 180 km/s, and for the peculiar
motion of about 150 km/s of the Local Group with respect to
the mean local velocity eld. We have also explored nonlinear
gravitational models, which allow for independent constraints on

and the galaxy bias on scales of  300 km/s. We discuss the
latest results from this analysis.
Co-authors: J.A. Willick (Stanford), J.L. Tonry (Hawaii), M.A.
Strauss (Princeton), & M. Davis (Berkeley)
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