The VIMOS Public Extragalactic Redshift Survey (VIPERS): An unbiased estimate of the growth rate of structure at hzi = 0.85 using the clustering of luminous blue galaxies
- Creators
- Mohammad, F. G.
- Granett, B. R.
- Guzzo, L.
- Bel, J.
- Branchini, E.
- De La Torre, S.
- Moscardini, L.
- Peacock, J. A.
- Bolzonella, M.
- Garilli, B.
- Scodeggio, M.
- Abbas, U.
- Adami, C.
- Bottini, D.
- Cappi, A.
- Cucciati, O.
- Davidzon, I.
- Franzetti, P.
- Fritz, A.
- Iovino, A.
- Krywult, J.
- Le Brun, V.
- Le Fèvre, O.
- MacCagni, D.
- Małek, K.
- Marulli, F.
- Polletta, M.
- Pollo, A.
- Tasca, L. A. M.
- Tojeiro, R.
- Vergani, D.
- Zanichelli, A.
- Arnouts, S.
- Coupon, J.
- De Lucia, G.
- Ilbert, O.
- Moutard, T.
- Others:
- Mohammad, F. G.
- Granett, B. R.
- Guzzo, L.
- Bel, J.
- Branchini, E.
- De La Torre, S.
- Moscardini, L.
- Peacock, J. A.
- Bolzonella, M.
- Garilli, B.
- Scodeggio, M.
- Abbas, U.
- Adami, C.
- Bottini, D.
- Cappi, A.
- Cucciati, O.
- Davidzon, I.
- Franzetti, P.
- Fritz, A.
- Iovino, A.
- Krywult, J.
- Le Brun, V.
- Le Fèvre, O.
- Maccagni, D.
- Małek, K.
- Marulli, F.
- Polletta, M.
- Pollo, A.
- Tasca, L. A. M.
- Tojeiro, R.
- Vergani, D.
- Zanichelli, A.
- Arnouts, S.
- Coupon, J.
- De Lucia, G.
- Ilbert, O.
- Moutard, T.
Description
We used the VIMOS Public Extragalactic Redshift Survey (VIPERS) final data release (PDR-2) to investigate the performance of colour-selected populations of galaxies as tracers of linear large-scale motions. We empirically selected volume-limited samples of blue and red galaxies as to minimise the systematic error on the estimate of the growth rate of structure fδ 8 from the anisotropy of the two-point correlation function. To this end, rather than rigidly splitting the sample into two colour classes we defined the red or blue fractional contribution of each object through a weight based on the (U-V) colour distribution. Using mock surveys that are designed to reproduce the observed properties of VIPERS galaxies, we find the systematic error in recovering the fiducial value of fδ 8 to be minimised when using a volume-limited sample of luminous blue galaxies. We modelled non-linear corrections via the Scoccimarro extension of the Kaiser model (with updated fitting formulae for the velocity power spectra), finding systematic errors on fδ 8 of below 1-2%, using scales as small as 5 h -1 Mpc.We interpret this result as indicating that selection of luminous blue galaxies maximises the fraction that are central objects in their dark matter haloes; this in turn minimises the contribution to the measured ϵ(rp;π) 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 blue objects, consistent with the presence of a significant fraction of blue, fainter satellites dominated by non-streaming, orbital velocities. We measured a value of fδ 8 = 0.45±0.11 over the single redshift range 0:6≤z≤1:0, corresponding to an effective redshift for the blue galaxies hzi = 0:85. Including in the likelihood the potential extra information contained in the blue-red galaxy cross-correlation function does not lead to an appreciable improvement in the error bars, while it increases the systematic error.
Additional details
- URL
- http://hdl.handle.net/11567/1071204
- URN
- urn:oai:iris.unige.it:11567/1071204
- Origin repository
- UNIGE