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A Local Supercluster velocity field model is considered which includes galaxy deceleration by spherically symmetric density enhancement and Local Group random motion with respect to nearby galaxies, and whose free parameters are adjusted to minimize scatter about the IR luminosity-H I velocity width relation. This adjustment yields a best estimate for the amplitude of the deceleration pattern at the Local Group position of 250 + or - 64 km/sec, and a total velocity toward the Virgo cluster of 331 + or - 41 km/sec. Potential systematic errors have been minimized through the selective pruning of the sample used, and Monte Carlo experiment calibration of the remaining systematic errors. A significant reduction in residual amplitudes is found upon testing for differential rotation about the center of the Supercluster. The derived total velocity with respect to the Supercluster shows better agreement with the velocity inferred from the 3 K background dipole anisotropy than has been previously obtained.
Aaronson et al. (Thu,) studied this question.