Statistics – Computation
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252....1k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Sept. 1, 1991, p. 1-12.
Statistics
Computation
132
Galaxies, Infrared Astronomy Satellite, Spatial Distribution, Velocity Distribution, Computational Astrophysics, Density Distribution, Gravitational Effects, Universe
Scientific paper
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.
Efstathiou George
Ellis Richard
Frenk Carlos
Kaiser Nicholas
Lawrence Andy
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