The large-scale velocity field beyond the local supercluster

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Galactic Clusters, Local Group (Astronomy), Red Shift, Galactic Evolution, Relic Radiation, Velocity Distribution

Scientific paper

Relative distances of 16 clusters of galaxies in the redshift range from 3000 to 11,000 km/s are measured using the I-band Tully-Fisher relation. Different techniques of deriving distances of clusters using a distance indicator are discussed and compared in regard to the sample selection bias. The large-scale peculiar velocity field as traced by our sample clusters is found to be highly nonrandom, and appears to be a coherent flow, in the cosmic microwave background frame; the flow is towards the general direction of the 'Great Attractor', with an amplitude of some 400-600 km/s at the position of the Local Group.

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