The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations

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ID: 300192
2011
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Abstract
We present measurements of the baryon acoustic peak at redshifts z = 0.44, 0.6 and 0.73 in the galaxy correlation function of the final dataset of the WiggleZ Dark Energy Survey. We combine our correlation function with lower-redshift measurements from the 6-degree Field Galaxy Survey and Sloan Digital Sky Survey, producing a stacked survey correlation function in which the statistical significance of the detection of the baryon acoustic peak is 4.9-sigma relative to a zero-baryon model with no peak. We fit cosmological models to this combined baryon acoustic oscillation (BAO) dataset comprising six distance-redshift data points, and compare the results to similar fits to the latest compilation of supernovae (SNe) and Cosmic Microwave Background (CMB) data. The BAO and SNe datasets produce consistent measurements of the equation-of-state w of dark energy, when separately combined with the CMB, providing a powerful check for systematic errors in either of these distance probes. Combining all datasets we determine w = -1.03 +/- 0.08 for a flat Universe, consistent with a cosmological constant model. Assuming dark energy is a cosmological constant and varying the spatial curvature, we find Omega_k = -0.004 +/- 0.006.
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Authors Chris Blake, Eyal Kazin, Florian Beutler, T. M. Davis, David Parkinson, Sarah Brough, Matthew Colless, C. Contreras, W. J. Couch, S. M. Croom, Darren Croton, M. J. Drinkwater, Karl Förster, D. G. Gilbank, M. D. Gladders, Karl Glazebrook, Ben Jelliffe, Russell J. Jurek, I-hui Li, Barry F. Madore, D. Christopher Martin, Kevin A. Pimbblet, Gregory B. Poole, Michael Pracy, R. Sharp, Emily Wisnioski, David Woods, Ted K. Wyder, H. K. C. Yee
Journal monthly notices of the royal astronomical society
Year 2011
DOI
10.1111/j.1365-2966.2011.19592.x
URL
https://doi.org/10.1111/j.1365-2966.2011.19592.x
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