TY - JOUR

T1 - The WiggleZ Dark Energy Survey: Testing the cosmological model with baryon acoustic oscillations at z= 0.6

AU - Blake, Chris

AU - Davis, Tamara

AU - Poole, Gregory

AU - Parkinson, David

AU - Brough, Sarah

AU - Colless, Matthew

AU - Contreras, Carlos

AU - Couch, Warrwick

AU - Croom, Scott

AU - Drinkwater, Michael

AU - Forster, Karl

AU - Gilbank, David

AU - Gladders, Michael

AU - Glazebrook, Karl

AU - Jelliffe, Ben

AU - Jurek, Russell

AU - Li, I-hui

AU - Madore, Barry

AU - Martin, Damien

AU - Pimbblet, Kevin

AU - Pracy, Michael

AU - Sharp, Robert

AU - Wisnioski, Emily

AU - Woods, David

AU - Wyder, Ted

AU - Yee, Howard

PY - 2011

Y1 - 2011

N2 - 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= 132509 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 A? 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 3.2I?. 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 I? 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 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.

AB - 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= 132509 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 A? 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 3.2I?. 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 I? 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 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.

U2 - 10.1111/j.1365-2966.2011.19077.x

DO - 10.1111/j.1365-2966.2011.19077.x

M3 - Article

SN - 0035-8711

VL - 415

SP - 2892

EP - 2909

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -