Comparison of the ENEAR Peculiar Velocities with the PSCz Gravity Field

Details Comparison of the ENEAR Peculiar Velocities with the PSCz Gravity Field Comparison of the ENEAR Peculiar Velocities with the PSCz Gravity Field

2000-06-05

arxiv.org/abs/astro-ph/0006062v1

Mon.Not.Roy.Astron.Soc. 320 (2001) L21

Astronomy and Astrophysics

Astrophysics

Submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04107.x

We present a comparison between the peculiar velocity field measured from the ENEAR all-sky $D_n-\sigma$ catalog and that derived from the galaxy distribution of the IRAS PSCz redshift survey. The analysis is based on a modal expansion of these data in redshift space by means of spherical harmonics and Bessel functions. The effective smoothing scale of the expansion is almost linear with redshift reaching 1500km/s at 3000km/s. The general flow patterns in the filtered ENEAR and PSCz velocity fields agree well within 6000km/s, assuming a linear biasing relation between the mass and the PSCz galaxies. The comparison allows us to determine the parameter $\beta=\Omega^{0.6}/b$, where $\Omega$ is the cosmological density 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 values obtained from Tully-Fisher surveys.

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