The large-scale distribution of IRAS galaxies and the predicted peculiar velocity field

N. Kaiser, G. Efstathiou, W. Saunders, R. Ellis, C. Frenk, A. Lawrence, M. Rowan-Robinson

Research output: Contribution to journalArticlepeer-review

Abstract

The QDOT IRAS galaxy redshift is used to construct a smoothed density field, corrected for peculiar velocity distortion, of a region of the local universe out to about 150/h Mpc. The survey is based on a one-in-six random sample of all IRAS galaxies brighter than 0.6 Jy at 60 microns. Predicted peculiar velocities are calculated from this density field, assuming gravitational instability theory, and compared to observed velocities derived from the Tully-Fisher (1987) and Dn - sigma techniques. A good correlation is seen, from which it is estimated that b(IRAS)-Omega exp -0.6 is approximately equal to 1.16 + or - 0.21, which is in general agreement with earlier results from analysis of the Local Group motion. It is inferred that, if IRAS galaxies trace the mass on large scales, the universe has a density very close to the critical value.
Original languageEnglish
Pages (from-to)1-12
JournalMonthly Notices of the Royal Astronomical Society
Volume252
DOIs
Publication statusPublished - 1 Sep 1991

Keywords

  • Galaxies
  • Infrared Astronomy Satellite
  • Spatial Distribution
  • Velocity Distribution
  • Computational Astrophysics
  • Density Distribution
  • Gravitational Effects
  • Universe

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