The WiggleZ Dark Energy Survey: testing the cosmological model with baryon acoustic oscillations at z=0.6

Blake, Chris, Davis, Tamara, Poole, Gregory B., Parkinson, David, Brough, Sarah, Colless, Matthew, Contreras, Carlos, Couch, Warrick, Croom, Scott, Drinkwater, Michael J., Forster, Karl, Gilbank, David, Gladders, Mike, Glazebrook, Karl, Jelliffe, Ben, Jurek, Russell J., Li, I-hui, Madore, Barry, Martin, D. Christopher, Pimbblet, Kevin, Pracy, Michael, Sharp, Rob, Wisnioski, Emily, Woods, David, Wyder, Ted K. and Yee, H. K. C. (2011) The WiggleZ Dark Energy Survey: testing the cosmological model with baryon acoustic oscillations at z=0.6. Monthly Notices of the Royal Astronomical Society, 415 3: 2892-2909. doi:10.1111/j.1365-2966.2011.19077.x


Author Blake, Chris
Davis, Tamara
Poole, Gregory B.
Parkinson, David
Brough, Sarah
Colless, Matthew
Contreras, Carlos
Couch, Warrick
Croom, Scott
Drinkwater, Michael J.
Forster, Karl
Gilbank, David
Gladders, Mike
Glazebrook, Karl
Jelliffe, Ben
Jurek, Russell J.
Li, I-hui
Madore, Barry
Martin, D. Christopher
Pimbblet, Kevin
Pracy, Michael
Sharp, Rob
Wisnioski, Emily
Woods, David
Wyder, Ted K.
Yee, H. K. C.
Title The WiggleZ Dark Energy Survey: testing the cosmological model with baryon acoustic oscillations at z=0.6
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
1365-2966
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2011.19077.x
Open Access Status DOI
Volume 415
Issue 3
Start page 2892
End page 2909
Total pages 18
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2012
Language eng
Formatted abstract
We measure the imprint of baryon acoustic oscillations (BAOs) in the galaxy clustering pattern at the highest redshift achieved to date, z= 0.6, using the distribution of N= 132 509 emission-line galaxies in the WiggleZ Dark Energy Survey. We quantify BAOs using three statistics: the galaxy correlation function, power spectrum and the band-filtered estimator introduced by Xu et al. The results are mutually consistent, corresponding to a 4.0 per cent measurement of the cosmic distance–redshift relation at z= 0.6 [in terms of the acoustic parameter ‘A(z)’ introduced by Eisenstein et al., we find A(z= 0.6) = 0.452 ± 0.018]. Both BAOs and power spectrum shape information contribute towards these constraints. The statistical significance of the detection of the acoustic peak in the correlation function, relative to a wiggle-free model, is 3.2σ. The ratios of our distance measurements to those obtained using BAOs in the distribution of luminous red galaxies at redshifts z= 0.2 and 0.35 are consistent with a flat Λ cold dark matter model that also provides a good fit to the pattern of observed fluctuations in the cosmic microwave background radiation. The addition of the current WiggleZ data results in a ≈30 per cent improvement in the measurement accuracy of a constant equation of state, w, using BAO data alone. Based solely on geometric BAO distance ratios, accelerating expansion (w < −1/3) is required with a probability of 99.8 per cent, providing a consistency check of conclusions based on supernovae observations. Further improvements in cosmological constraints will result when the WiggleZ survey data set is complete.
Keyword Surveys
Cosmological parameters
Dark energy
Large-scale structure of Universe
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2012 Collection
 
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