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We use the VIPERS final data release to investigate the performance ofcolour-selected populations of galaxies as tracers of linear large-scalemotions. We empirically select volume-limited samples of blue and red galaxiesas to minimise the systematic error on the estimate of the growth rate$f\sigma_8$ from the anisotropy of the two-point correlation function. To thisend, rather than rigidly splitting the sample into two colour classes we definethe red/blue fractional contribution of each object through a weight based onthe $(U-V)$ colour distribution. Using mock surveys that are designed toreproduce the observed properties of VIPERS galaxies, we find the systematicerror in recovering the fiducial value of $f\sigma_8$ to be minimized whenusing a volume-limited sample of luminous blue galaxies. We model non-linearcorrections via the Scoccimarro extension of the Kaiser model, findingsystematic errors on $f\sigma_8$ of below $1-2\%$, using scales as small as 5$h^{-1}\mathrm{Mpc}$. We interpret this result as indicating that selection ofluminous blue galaxies maximises the fraction that are central objects in theirdark matter haloes; this in turn minimises the contribution to the measured$\xi(r_p,\pi)$ from the 1-halo term, which is dominated by non-linear motions.The gain is inferior if one uses the full magnitude-limited sample of blueobjects, consistent with the presence of a significant fraction of blue,fainter satellites dominated by non-streaming, orbital velocities. We measure avalue of $f\sigma_8=0.45 \pm 0.11$ over the single redshift range $0.6\le z\le1.0$, corresponding to an effective redshift for the blue galaxies$\left<z\right>=0.85$. Including in the likelihood the potential extrainformation contained in the blue-red galaxy cross-correlation function doesnot lead to an appreciable improvement in the error bars, while it increasesthe systematic error.

astronomy and astrophysics

The VIMOS Public Extragalactic Redshift Survey (VIPERS): An unbiased  estimate of the growth rate of structure at $\mathbf{\left<z\right>=0.85}$  using the clustering of luminous blue galaxies

The VIMOS Public Extragalactic Redshift Survey (VIPERS): An unbiased estimate of the growth rate of structure at $\mathbf{\left=0.85}$ using the clustering of luminous blue galaxies