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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The WiggleZ Dark Energy Survey: The growth rate of cosmic structure since redshift z=0.9
Monthly Notices of the Royal Astronomical Society, Volume 415, No. 3, Year 2011
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Description
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 Λ cold dark matter (ΛCDM) cosmological model with matter density parameter Ωm= 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, Pθθ(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. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Blake, Chris A.
Australia, Hawthorn
Swinburne University of Technology
Brough, Sarah
Australia
Australian Astronomical Observatory
Colless, Matthew
Australia
Australian Astronomical Observatory
Contreras, Carlos
Australia, Hawthorn
Swinburne University of Technology
Couch, Warrick J.
Australia, Hawthorn
Swinburne University of Technology
Croom, Scott M.
Australia, Sydney
The University of Sydney
Davis, Tamara M.
Australia, Brisbane
The University of Queensland
Denmark, Copenhagen
Københavns Universitet
Drinkwater, Michael J.
Australia, Brisbane
The University of Queensland
Forster, Karl G.
United States, Pasadena
California Institute of Technology
Gilbank, David G.
Canada, Waterloo
University of Waterloo
Gladders, Michael D.
United States, Chicago
The University of Chicago
Glazebrook, Karl G.
Australia, Hawthorn
Swinburne University of Technology
Jelliffe, Ben
Australia, Sydney
The University of Sydney
Jurek, Russell J.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Li, I. Hui
Australia, Hawthorn
Swinburne University of Technology
Madore, Barry F.
United States, Washington, D.c.
Carnegie Institution of Washington
Martin, Dirk Christopher
United States, Pasadena
California Institute of Technology
Pimbblet, Kevin A.
Australia, Clayton
Monash University
Poole, Gregory B.
Australia, Hawthorn
Swinburne University of Technology
Pracy, Michael B.
Australia, Hawthorn
Swinburne University of Technology
Australia, Canberra
The Australian National University
Sharp, Rob G.
Australia
Australian Astronomical Observatory
Australia, Canberra
The Australian National University
Wisnioski, Emily
Australia, Hawthorn
Swinburne University of Technology
Woods, David
Canada, Vancouver
The University of British Columbia
Wyder, Ted K.
United States, Pasadena
California Institute of Technology
Yee, Howard K.C.
Canada, Toronto
University of Toronto
Statistics
Citations: 427
Authors: 25
Affiliations: 14
Identifiers
Doi:
10.1111/j.1365-2966.2011.18903.x
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative