Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..191m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, Feb. 1986, p. 191-198.
Astronomy and Astrophysics
Astronomy
100
Anisotropy, Astronomical Catalogs, Cosmology, Galaxies, Infrared Astronomy Satellite, Mass Distribution, Angular Correlation, Astronomical Maps, Galactic Clusters, Red Shift
Scientific paper
The IRAS point-source catalog provides a unique opportunity to generate a galaxy catalog uniformly selected over most of the sky (greater than 9.5 sr). Such a catalog of 6730 sources has been generated, and a small (4 percent - 7 percent) but robust dipole anisotropy in the galaxy distribution that points towards l = 235 deg, b = 45 deg, within 30 deg of the microwave dipole anisotropy is found. Angular correlation analysis suggests that subsets of the catalog have characteristic distances D asterisk approximately 50-100 per h Mpc. The good agreement in direction of these dipoles suggests that the IRAS galaxies roughly trace the large-scale mass distribution, that the microwave dipole velocity is mostly induced by the local supercluster (cz less than 3000 km/s), and that the indicated cosmological density is high (Omega 0.5). A more precise estimate will require a full-sky redshift survey.
Davis Martin
Meiksin Avery
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