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arxiv: 1204.3674 · v2 · submitted 2012-04-17 · 🌌 astro-ph.CO

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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 Davis
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Michael J. Drinkwater Karl Forster David Gilbank Mike Gladders Karl Glazebrook Ben Jelliffe Russell J. Jurek I-hui Li Barry Madore Chris Martin Kevin Pimbblet Gregory B. Poole Michael Pracy Rob Sharp Emily Wisnioski David Woods Ted Wyder Howard Yee
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keywords expansionmeasurementsredshiftacousticbaryonbinscombiningdark
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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 D_A(z) = (1205 +/- 114, 1380 +/- 95, 1534 +/- 107) Mpc and H(z) = (82.6 +/- 7.8, 87.9 +/- 6.1, 97.3 +/- 7.0) km/s/Mpc at these three redshifts. Further combining our results with other baryon acoustic oscillation and distant supernovae datasets, we use a Monte Carlo Markov Chain technique to determine the evolution of the Hubble parameter H(z) as a stepwise function in 9 redshift bins of width dz = 0.1, also marginalizing over the spatial curvature. Our measurements of H(z), which have precision better than 7% 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.

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