Comparison of the ENEAR peculiar velocities with the PSCz gravity field

Adi Nusser, Luiz N. Da Costa, Enzo Branchini, Mariangela Bernardi, M. V. Alonso, Gary Wegner, C. N.A. Willmer, P. S. Pellegrini

Research output: Contribution to journalReview articlepeer-review

30 Scopus citations


We present a comparison between the peculiar velocity field measured from the ENEAR all-sky Dn-σ catalogue and that derived from the galaxy distribution of the IRAS Point Source Catalog Redshift Survey (PSCz). 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 1500 km s-1 at 3000 km s-1. The general flow patterns in the filtered ENEAR and PSCz velocity fields agree well within 6000 km s-1, assuming a linear biasing relation between the mass and the PSCz galaxies. The comparison allows us to determine the parameter β = Ω0.6/b, where Ω is the cosmological density parameter and b is the linear biasing factor. A likelihood analysis of the ENEAR and PSCz modes yields β = 0.5 ± 0.1, in good agreement with values obtained from Tully-Fisher surveys.

Original languageEnglish (US)
Pages (from-to)L21-L24
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Jan 21 2001
Externally publishedYes


  • Cosmology: Observations
  • Dark matter
  • Large-scale structure of Universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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