Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301l...1y&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. L1-L5. SERC-supported researc
Astronomy and Astrophysics
Astronomy
130
Galaxies, Infrared Astronomy, Infrared Astronomy Satellite, Relic Radiation, Anisotropy, Background Radiation, Dipole Moments, Error Analysis, Galactic Structure, Virial Theorem
Scientific paper
IRAS 60 micron sources are used to map the local gravitational field, and to determine its dipole component, on the assumption that the infrared radiation traces the matter. The dipole moment is found to point in the direction l = 248 + or - 9 and b = 40 + or - 8, 26 deg + or - 10 deg away from the direction of the velocity of the Local Group relative to the microwave background radiation (statistical sampling errors only). Comparison of the two anisotropies, using the luminosity function of the IRAS galaxies and linear perturbation theory, yields an estimate of the cosmological density parameter of 0.85 + or - 0.16 (statistical IRAS error only), with nonlinear effects increasing the parameter by 0.15 percent. These values are in apparent disagreement with the values of 0.1-0.2 deduced from the Virgocentric infall and the cosmic virial theorem.
Rowan-Robinson Michael
Walker Danielle
Yahil Amos
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