Comparing the SBF Survey Velocity Field with the Gravity Field from Redshift Surveys
J. P. Blakeslee, M. Davis, J. L. Tonry, E. A. Ajhar, A. Dressler
Abstract
We compare the predicted local peculiar velocity field from the IRAS 1.2 Jy flux-limited redshift survey and the Optical Redshift Survey (ORS) to the measured peculiar velocities from the recently completed SBF Survey of Galaxy Distances. The analysis produces a value of β= Ω0.6/b for the redshift surveys, where b is the linear biasing factor, and a tie to the Hubble flow, i.e., a value of H0, for the SBF Survey. There is covariance between these parameters, but we find good fits with H0 ≈ 74 for the SBF distances, βI ≈ 0.44 for the IRAS survey predictions, and βO ≈ 0.3 for the ORS. The small-scale velocity error 200 is similar to, though slightly larger than, the value obtained in our parametric flow modeling with SBF.
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