Large-scale anisotropy in the Hubble flow

Details Large-scale anisotropy in the Hubble flow Large-scale anisotropy in the Hubble flow

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..506c&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, April 10, 1986, p. 506-508.

Astronomy and Astrophysics

Astronomy

139

Anisotropy, Galactic Clusters, Hubble Diagram, Local Group (Astronomy), Space Density, Astronomical Models, Astronomical Photometry, Cosmology, Dark Matter, Infrared Astronomy, Luminous Intensity, Red Shift, Spatial Distribution

Scientific paper

Detection of anisotropy in the Hubble flow is one of the outstanding problems of observational cosmology. The authors have obtained infrared photometry for an all-sky sample of ScI-II galaxies identified by Rubin et al. at a mean redshift of 5,100 km s-1. At this distance these galaxies provide information on the Hubble flow well outside the Local Supercluster. From observations of half the sample, well distributed across the sky, the authors find a systematic streaming velocity of these galaxies of ≡1,000±300 km s-1. In the context of current speculation regarding non-baryonic particle species which may dominate the mass of the Universe, such large velocities on these spatial scales appear to exclude cold dark matter models.

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