The WiggleZ Dark Energy Survey: Joint measurements of the expansion and growth history at z < 1

Chris Blake*, Sarah Brough, Matthew Colless, Carlos Contreras, Warrick Couch, Scott Croom, Darren Croton, Tamara M. Davis, Michael J. Drinkwater, Karl Forster, David Gilbank, Mike Gladders, Karl Glazebrook, Ben Jelliffe, Russell J. Jurek, I. hui Li, Barry Madore, D. Christopher Martin, Kevin Pimbblet, Gregory B. PooleMichael Pracy, Rob Sharp, Emily Wisnioski, David Woods, Ted K. Wyder, H. K.C. Yee

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    738 Citations (Scopus)

    Abstract

    We perform a joint determination of the distance-redshift relation and cosmic expansion rate at redshifts z = 0.44, 0.6 and 0.73 by combining measurements of the baryon acoustic peak and Alcock-Paczynski distortion from galaxy clustering in the WiggleZ Dark Energy Survey, using a large ensemble of mock catalogues to calculate the covariance between the measurements. We find that DA(z) = (1205 ± 114, 1380 ± 95, 1534 ± 107)Mpc and H(z) = (82.6 ± 7.8, 87.9 ± 6.1, 97.3 ± 7.0)kms-1Mpc-1 at these three redshifts. Further combining our results with other baryon acoustic oscillation and distant supernovae data sets, we use a Monte Carlo Markov Chain technique to determine the evolution of the Hubble parameter H(z) as a stepwise function in nine redshift bins of width Δz = 0.1, also marginalizing over the spatial curvature. Our measurements of H(z), which have precision better than 7 per cent in most redshift bins, are consistent with the expansion history predicted by a cosmological constant dark energy model, in which the expansion rate accelerates at redshift z < 0.7.

    Original languageEnglish
    Pages (from-to)405-414
    Number of pages10
    JournalMonthly Notices of the Royal Astronomical Society
    Volume425
    Issue number1
    DOIs
    Publication statusPublished - 1 Sept 2012

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