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Cosmicflows-2

Published online by Cambridge University Press:  12 October 2016

R. Brent Tully ,
Hélène M. Courtois ,
Yehuda Hoffman  and
Daniel Pomarède
R. Brent Tully
Affiliation:
Institute for Astronomy, University of Hawaii, Honolulu, HI, 96822, USA. email: [email protected]
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.

Keywords

Galaxies: distances and redshiftspeculiar velocitiesdark matterlarge scale structure of galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 305 - 309
Copyright
Copyright © International Astronomical Union 2016 

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