SIMBAD references

2016MNRAS.455..386S - Mon. Not. R. Astron. Soc., 455, 386-401 (2016/January-1)

The 6dF Galaxy Survey: bulk flows on 50-70 h-1 Mpc scales.

SCRIMGEOUR M.I., DAVIS T.M., BLAKE C., STAVELEY-SMITH L., MAGOULAS C., SPRINGOB C.M., BEUTLER F., COLLESS M., JOHNSON A., JONES D.H., KODA J., LUCEY J.R., MA Y.-Z., MOULD J. and POOLE G.B.

Abstract (from CDS):

We measure the bulk flow of the local Universe using the 6dF Galaxy Survey peculiar velocity sample (6dFGSv), the largest and most homogeneous peculiar velocity sample to date. 6dFGSv is a Fundamental Plane sample of ∼ 104 peculiar velocities covering the whole Southern hemisphere for galactic latitude {verbar}b{verbar} > 10°, out to redshift z = 0.0537. We apply the `minimum variance' bulk flow weighting method, which allows us to make a robust measurement of the bulk flow on scales of 50 and 70h-1Mpc. We investigate and correct for potential bias due to the lognormal velocity uncertainties, and verify our method by constructing Λ cold dark matter (ΛCDM) 6dFGSv mock catalogues incorporating the survey selection function. For a hemisphere of radius 50h-1Mpc we find a bulk flow amplitude of U = 248±58 km/s in the direction (l, b) = (318°±20°, 40°±13°), and for 70h-1Mpc we find U = 243±58 km/s, in the same direction. Our measurement gives us a constraint on σ8 of 1.01^+1.07_-0.58. Our results are in agreement with other recent measurements of the direction of the bulk flow, and our measured amplitude is consistent with a ΛCDM prediction.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): surveys - galaxies: kinematics and dynamics - galaxies: statistics - cosmology: observations - large-scale structure of Universe

Simbad objects: 8

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2019.12.10-16:47:44

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