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

Blake, Chris and Forster, Karl and Martin, D. Christopher and Wyder, Ted K. (2012) The WiggleZ Dark Energy Survey: joint measurements of the expansion and growth history at z < 1. Monthly Notices of the Royal Astronomical Society, 425 (1). pp. 405-414. ISSN 0035-8711. doi:10.1111/j.1365-2966.2012.21473.x.

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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^(−1) Mpc^(−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.

Item Type:Article
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Forster, Karl0000-0001-5800-5531
Martin, D. Christopher0000-0002-8650-1644
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 June 7. Received 2012 May 25; in original form 2012 April 16. Article first published online: 19 Jul. 2012. We thank the anonymous referee for very useful feedback which greatly improved the presentation of this paper. CB acknowledges useful discussions with Eric Linder, Berian James, Eiichiro Komatsu, David Rapetti, Steve Allen, Eyal Kazin, Licia Verde and Raul Jimenez, and thanks the astronomy groups at Berkeley and Stanford for hospitality during the completion of this work. We acknowledge financial support from the Australian Research Council through Discovery Project grants DP0772084 and DP1093738 and Linkage International travel grant LX0881951. SC and DC acknowledge the support of an Australian Research Council QEII Fellowship. We are also grateful for support from the Centre for All-sky Astrophysics, an Australian Research Council Centre of Excellence funded by grant CE11E0090.
Group:Space Radiation Laboratory, Space Astrophysics Laboratory
Funding AgencyGrant Number
Australian Research CouncilDP0772084
Australian Research CouncilDP1093738
Linkage International Travel GrantLX0881951
Australian Research Council QEII FellowshipUNSPECIFIED
Centre for All-sky AstrophysicsUNSPECIFIED
Australian Research Council Centre of ExcellenceCE11E0090
Subject Keywords:surveys; distance scale; large-scale structure of Universe
Issue or Number:1
Record Number:CaltechAUTHORS:20120927-133201364
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Official Citation:Blake, C., Brough, S., Colless, M., Contreras, C., Couch, W., Croom, S., Croton, D., Davis, T. M., Drinkwater, M. J., Forster, K., Gilbank, D., Gladders, M., Glazebrook, K., Jelliffe, B., Jurek, R. J., Li, I.-h., Madore, B., Martin, D. C., Pimbblet, K., Poole, G. B., Pracy, M., Sharp, R., Wisnioski, E., Woods, D., Wyder, T. K. and Yee, H. K. C. (2012), The WiggleZ Dark Energy Survey: joint measurements of the expansion and growth history at z < 1. Monthly Notices of the Royal Astronomical Society, 425: 405–414. doi: 10.1111/j.1365-2966.2012.21473.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34519
Deposited On:28 Sep 2012 17:37
Last Modified:09 Nov 2021 23:08

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