The 6dF Galaxy Survey: Bulk Flows on $50-70 h^{-1}$ Mpc scales
  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 $\sim10^4$
peculiar velocities covering the whole southern hemisphere for galactic
latitude $|b| > 10^\circ$, 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 $70\,h^{-1}{\rm Mpc}$. We
investigate and correct for potential bias due to the lognormal velocity
uncertainties, and verify our method by constructing $\Lambda{\rm CDM}$ 6dFGSv
mock catalogues incorporating the survey selection function. For a hemisphere
of radius $50\,h^{-1}{\rm Mpc}$ we find a bulk flow amplitude of
$U=248\pm58\,{\rm km}\,{\rm s}^{-1}$ in the direction $(l,b) =
(318^\circ\pm20^\circ,40^\circ\pm13^\circ)$, and for $70\,h^{-1}{\rm Mpc}$ we
find $U=243\pm58\,{\rm km}\,{\rm s}^{-1}$, in the same direction. Our
measurement gives us a constraint on $\sigma_8$ 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 $\Lambda{\rm CDM}$
prediction.
