TY - JOUR

T1 - The WiggleZ Dark Energy Survey: The growth rate of cosmic structure since redshift z=0.9

AU - Blake, Chris

AU - Brough, Sarah

AU - Colless, Matthew

AU - Contreras, Carlos

AU - Couch, Warrwick

AU - Croom, Scott

AU - Davis, Tamara

AU - Drinkwater, Michael

AU - Forster, Karl

AU - Gilbank, David

AU - Gladders, Michael

AU - Glazebrook, Karl

AU - Jelliffe, Ben

AU - Jurek, Russell

AU - Li, I-hui

AU - Madore, Barry

AU - Martin, Damien

AU - Pimbblet, Kevin

AU - Poole, Gregory

AU - Pracy, Michael

AU - Sharp, Robert

AU - Wisnioski, Emily

AU - Woods, David

AU - Wyder, Ted

AU - Yee, Howard

PY - 2011

Y1 - 2011

N2 - We present precise measurements of the growth rate of cosmic structure for the redshift range 0.1 <z <0.9, using redshift-space distortions in the galaxy power spectrum of the WiggleZ Dark Energy Survey. Our results, which have a precision of around 10 per cent in four independent redshift bins, are well fitted by a flat I? cold dark matter (I?CDM) cosmological model with matter density parameter I?m= 0.27. Our analysis hence indicates that this model provides a self-consistent description of the growth of cosmic structure through large-scale perturbations and the homogeneous cosmic expansion mapped by supernovae and baryon acoustic oscillations. We achieve robust results by systematically comparing our data with several different models of the quasi-linear growth of structure including empirical models, fitting formulae calibrated to N-body simulations, and perturbation theory techniques. We extract the first measurements of the power spectrum of the velocity divergence field, PI?I?(k), as a function of redshift (under the assumption that, where g is the galaxy overdensity field), and demonstrate that the WiggleZ galaxy-mass cross-correlation is consistent with a deterministic (rather than stochastic) scale-independent bias model for WiggleZ galaxies for scales k <0.3hMpc-1. Measurements of the cosmic growth rate from the WiggleZ Survey and other current and future observations offer a powerful test of the physical nature of dark energy that is complementary to distance-redshift measures such as supernovae and baryon acoustic oscillations.

AB - We present precise measurements of the growth rate of cosmic structure for the redshift range 0.1 <z <0.9, using redshift-space distortions in the galaxy power spectrum of the WiggleZ Dark Energy Survey. Our results, which have a precision of around 10 per cent in four independent redshift bins, are well fitted by a flat I? cold dark matter (I?CDM) cosmological model with matter density parameter I?m= 0.27. Our analysis hence indicates that this model provides a self-consistent description of the growth of cosmic structure through large-scale perturbations and the homogeneous cosmic expansion mapped by supernovae and baryon acoustic oscillations. We achieve robust results by systematically comparing our data with several different models of the quasi-linear growth of structure including empirical models, fitting formulae calibrated to N-body simulations, and perturbation theory techniques. We extract the first measurements of the power spectrum of the velocity divergence field, PI?I?(k), as a function of redshift (under the assumption that, where g is the galaxy overdensity field), and demonstrate that the WiggleZ galaxy-mass cross-correlation is consistent with a deterministic (rather than stochastic) scale-independent bias model for WiggleZ galaxies for scales k <0.3hMpc-1. Measurements of the cosmic growth rate from the WiggleZ Survey and other current and future observations offer a powerful test of the physical nature of dark energy that is complementary to distance-redshift measures such as supernovae and baryon acoustic oscillations.

UR - http://onlinelibrary.wiley.com.ezproxy.lib.monash.edu.au/doi/10.1111/j.1365-2966.2011.18903.x/abstract

U2 - 10.1111/j.1365-2966.2011.18903.x

DO - 10.1111/j.1365-2966.2011.18903.x

M3 - Article

VL - 415

SP - 2876

EP - 2891

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -