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

Blake, Chris and Forster, Karl and Martin, D. Christopher and Wyder, Ted K. (2011) The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z = 0.9. Monthly Notices of the Royal Astronomical Society, 415 (3). pp. 2876-2891. ISSN 0035-8711.

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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 Ω_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, P_(θθ) (k), as a function of redshift (under the assumption that P_(gθ) (k) = − √P_(gg)(k)P_(θθ) (k), 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 < 0.3 h Mpc^(−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.

Item Type:Article
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URLURL TypeDescription
Forster, Karl0000-0001-5800-5531
Martin, D. Christopher0000-0002-8650-1644
Additional Information:© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 April 12. Received 2011 March 26; in original form 2010 December 12. Article first published online: 7 Jun. 2011. We thank Carlton Baugh, Elise Jennings, Juliana Kwan, David Parkinson, Will Percival, Roman Scoccimarro and Yong-Seon Song for useful comments which influenced and improved the development of this paper. We are particularly grateful to Martin Crocce for providing power spectra for RPT and for helpful comments. We acknowledge financial support from the Australian Research Council through Discovery Project grants funding the positions of SB, MP, GBP and TD. SC acknowledges the support of the Australian Research Council through a QEII Fellowship. MJD and TD thank the Gregg Thompson Dark Energy Travel Fund for financial support. GALEX is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Finally, the WiggleZ Survey would not be possible without the dedicated work of the staff of the Australian Astronomical Observatory in the development and support of the AAOmega spectrograph, and the running of the AAT.
Group:Space Astrophysics Laboratory
Funding AgencyGrant Number
Australian Research CouncilUNSPECIFIED
Gregg Thompson Dark Energy Travel FundUNSPECIFIED
Subject Keywords:surveys; cosmological parameters; large-scale structure of Universe
Issue or Number:3
Record Number:CaltechAUTHORS:20110909-135550756
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Official Citation:Blake, C., Brough, S., Colless, M., Contreras, C., Couch, W., Croom, S., Davis, T., 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. (2011), The WiggleZ Dark Energy Survey: the growth rate of cosmic structure since redshift z=0.9. Monthly Notices of the Royal Astronomical Society, 415: 2876–2891. doi: 10.1111/j.1365-2966.2011.18903.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25278
Deposited By: Ruth Sustaita
Deposited On:09 Sep 2011 21:31
Last Modified:09 Mar 2020 23:46

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