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

Scrimgeour, Morag I., Davis, Tamara M., Blake, Chris, Staveley-Smith, Lister, Magoulas, Christina, Springob, Christopher M., Beutler, Florian, Colless, Matthew, Johnson, Andrew, Jones, D. Heath, Koda, Jun, Lucey, John R., Ma, Yin-Zhe, Mould, Jeremy and Poole, Gregory B. (2016) The 6dF Galaxy Survey: bulk flows on 50-70 h(-1) Mpc scales. Monthly Notices of the Royal Astronomical Society, 455 1: 386-401. doi:10.1093/mnras/stv2146

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Author Scrimgeour, Morag I.
Davis, Tamara M.
Blake, Chris
Staveley-Smith, Lister
Magoulas, Christina
Springob, Christopher M.
Beutler, Florian
Colless, Matthew
Johnson, Andrew
Jones, D. Heath
Koda, Jun
Lucey, John R.
Ma, Yin-Zhe
Mould, Jeremy
Poole, Gregory B.
Title The 6dF Galaxy Survey: bulk flows on 50-70 h(-1) Mpc scales
Formatted title
The 6dF Galaxy Survey: bulk flows on 50-70 h-1 Mpc scales
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2016-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1093/mnras/stv2146
Open Access Status File (Publisher version)
Volume 455
Issue 1
Start page 386
End page 401
Total pages 16
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Language eng
Formatted abstract
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 |b| > 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 70 h−1 Mpc. 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 50 h−1 Mpc we find a bulk flow amplitude of U = 248 ± 58 km s−1 in the direction (l, b) = (318° ± 20°, 40° ± 13°), and for 70 h−1 Mpc we find U = 243 ± 58 km s−1, in the same direction. Our measurement gives us a constraint on σ8 of 1.01−0.58+1.07. 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.
Keyword Surveys
Galaxies: kinematics and dynamics
Galaxies: statistics
Cosmology: observations
Large-scale structure of Universe
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Published online 2 November 2015

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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