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Cosmicflows-2

Published online by Cambridge University Press:  12 October 2016

R. Brent Tully
Affiliation:
Institute for Astronomy, University of Hawaii, Honolulu, HI, 96822, USA. email: tully@ifa.hawaii.edu
Hélène M. Courtois
Affiliation:
University of Lyon 1/CNRS/IN2P3, Lyon, France
Yehuda Hoffman
Affiliation:
Hebrew University of Jerusalem, 91904 Jerusalem, Israel
Daniel Pomarède
Affiliation:
Institut de Recherche sur les Lois Fondamentales de l'Univers, CEA/Saclay, 91191 Gif-sur-Yvette, France
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Abstract

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A compendium of over 8000 galaxy distances has been accumulated. Distance measurements permit the separation of observed velocities into cosmic expansion and peculiar velocity components. Only the radial component of peculiar velocities can be measured and individual errors are large, but a Wiener Filter procedure permits the reconstruction of three-dimensional motions and the density field that is responsible for these motions. A coherent flow pervades the entire domain of ± 15,000 km/s. Techniques are discussed for the separation of local and tidal components of the flow. Laniakea supercluster is identified as a region of contiguous infalling flows.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

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