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Cosmic Bulk Flow and the Local motions from CosmicFlows-2 dataset

Published online by Cambridge University Press:  27 October 2016

H. M. Courtois*
Affiliation:
University of Lyon 1 - CNRS/IN2P3, IPNL 4 rue Enrico Fermi 69622 Villeurbanne, France email: [email protected]
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Abstract

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Using the largest and most accurate ever catalog of galaxy peculiar velocities Cosmicflows-2, the large scale structure has been reconstructed by means of the Wiener filter and constrained realizations assuming as a Bayesian prior model the LCDM standard model of cosmology. Our main result is that the estimated bulk flow is consistent with the LCDM model with the WMAP inferred cosmological parameters. At R=50 (150)Mpc/h the estimated bulk velocity is 250 ± 21 (239 ± 38) km/s. The SGX and SGY components of the CMB dipole velocity are recovered by the Wiener Filter (WF) velocity field down to a very few km/s. The SGZ component of the estimated velocity, the one that is most affected by the Zone of Avoidance, is off by 126 km/s (an almost 2 sigma discrepancy).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

References

Hoffman, Y., Courtois, H. M., & Tully, R. B. 2015, MNRAS, 449, 4494 Google Scholar