2.2 The peculiar velocity flows of the local universe
Peculiar velocities are deviations from the smooth Hubble flow of the
expansion of the Universe. They are generated by the inhomogeneities
of the matter distribution and can be detected by measuring at the
same time the distance and the redshift of galaxies. They test
dynamically the predictions of the Cold Dark Matter models of the
evolution of the large scale structure in the local Universe. In the
context of the recently completed EFAR project the distances of 50
Clusters of Galaxies in the Corona-Borealis and Pisces-Cetus
superclusters using the Fundamental Plane distance estimator were
measured. The resulting mean bulk motions within 100 Mpc are small,
compatible with the predictions of ΛCDM. They rule out the
detections of large bulk motions claimed by other surveys.
last update:
10/2004, editor of this page: Roberto Philip Saglia
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