Comparison of the ENEAR peculiar velocities with the PSCz gravity field

We present a comparison between the peculiar velocity field measured from t he ENEAR all-sky D-n-sigma catalogue and that derived from the galaxy distr ibution of the IRAS Point Source Catalog Redshift Survey (PSCz). The analys is is based on a modal expansion of these data in redshift space by means o f spherical harmonics and Bessel functions. The effective smoothing scale o f the expansion is almost linear with redshift reaching 1500 km s(-1) at 30 00 km s(-1). The general flow patterns in the filtered ENEAR and PSCz veloc ity fields agree well within 6000 km s(-1), assuming a linear biasing relat ion between the mass and the PSCz galaxies. The comparison allows us to det ermine the parameter beta=Omega (0.6)b, where Omega is the cosmological den sity parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSCz modes yields beta =0.5 +/-0.1, in good agreement with v alues obtained from Tully-Fisher surveys.