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Cosmicflows-2

  • R. Brent Tully (a1), Hélène M. Courtois (a2), Yehuda Hoffman (a3) and Daniel Pomarède (a4)

Abstract

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.

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References

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Courtois, H. M., Tully, R. B., & Héraudeau, P. 2011a, MNRAS, 415, 1935
Courtois, H. M. et al. (2011b), MNRAS, 414, 2005
Courtois, H. M. et al. (2012), ApJ, 744, 43
Courtois, H. M. et al. (2013), AJ, 146, 69
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Tully, R. B. et al. 2013 AJ, 146, 86
Tully, R. B, Courtois, H. M, Hoffman, Y., & Pomarède, D. 2014 Nature, 513, 71
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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