Cosmological parameters from the IRAS galaxy sample

Details Cosmological parameters from the IRAS galaxy sample Cosmological parameters from the IRAS galaxy sample

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322...37v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. 37-47.

Statistics

Computation

49

Astronomical Spectroscopy, Computational Astrophysics, Cosmology, Galactic Structure, Infrared Spectra, Mass Distribution, Background Radiation, Hubble Constant, Infrared Astronomy Satellite, Microwaves, Perturbation Theory

Scientific paper

An IRAS-selected sample of galaxies is used to make a dynamical estimate of cosmological parameters. The galaxy sample of 8387 sources is flux limited at 0.75 Jy at 60 μm. It is assumed that this sample traces the mass density of the universe on scales of 40 Mpc, and that the microwave background velocity is gravitationally induced by this mass distribution. Using a standard luminosity function and the observed differential dipole function, the authors estimate that the bulk of the dipole is generated on scales of 35±10 Mpc. It is shown that the ratio of flux dipole to luminosity density is insensitive to the exact values of the parameters of the luminosity function. From linear theory in a Friedman universe, the authors make a dynamical estimate of Ω0, yielding Ω0≡ 1.2. The statistical errror of this estimate is 1σ = 0.36. Systematic errors may be as large as 55%. It is shown that the magnitude and position of the dipole in space is consistent with the observed galaxy-galaxy correlation function, and with estimates of H0.

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