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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The WiggleZ Dark Energy Survey: Improved distance measurements to z = 1 with reconstruction of the baryonic acoustic feature
Monthly Notices of the Royal Astronomical Society, Volume 441, No. 4, Year 2014
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Description
We present significant improvements in cosmic distance measurements from the WiggleZ Dark Energy Survey, achieved by applying the reconstruction of the baryonic acoustic feature technique. We show using both data and simulations that the reconstruction technique can often be effective despite patchiness of the survey, significant edge effects and shot-noise. We investigate three redshift bins in the redshift range 0.2 < z < 1, and in all three find improvement after reconstruction in the detection of the baryonic acoustic feature and its usage as a standard ruler. We measure model-independent distance measures DV(rfids/rs) of 1716 ± 83, 2221 ± 101, 2516 ± 86 Mpc (68 per cent CL) at effective redshifts z = 0.44, 0.6, 0.73, respectively, where DV is the volume-averaged distance, and rs is the sound horizon at the end of the baryon drag epoch. These significantly improved 4.8, 4.5 and 3.4 per cent accuracy measurements are equivalent to those expected from surveys with up to 2.5 times the volume of WiggleZ without reconstruction applied. These measurements are fully consistent with cosmologies allowed by the analyses of the Planck Collaboration and the Sloan Digital Sky Survey. We provide the DV(rfids/rs) posterior probability distributions and their covariances. When combining these measurements with temperature fluctuations measurements of Planck, the polarization of Wilkinson Microwave Anisotropy Probe 9, and the 6dF Galaxy Survey baryonic acoustic feature, we do not detect deviations from a flat Λ cold dark matter (ΛCDM) model. Assuming this model, we constrain the current expansion rate to H0 = 67.15 ± 0.98 km s-1Mpc-1. Allowing the equation of state of dark energy to vary, we obtain wDE =-1.080 ± 0.135. When assuming a curved ΛCDM model we obtain a curvature value of ΩK =-0.0043 ± 0.0047. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Kazin, Eyal A.
Australia, Hawthorn
Swinburne University of Technology
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Koda, Jun
Australia, Hawthorn
Swinburne University of Technology
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Blake, Chris A.
Australia, Hawthorn
Swinburne University of Technology
Padmanabhan, Nikhil
United States, New Haven
Yale University
Brough, Sarah
Australia
Australian Astronomical Observatory
Colless, Matthew
Australia
Australian Astronomical Observatory
Contreras, Carlos
Australia, Hawthorn
Swinburne University of Technology
Chile, La Serena
Las Campanas Observatory
Couch, Warrick J.
Australia, Hawthorn
Swinburne University of Technology
Australia
Australian Astronomical Observatory
Croom, Scott M.
Australia, Sydney
The University of Sydney
Croton, Darren J.
Australia, Hawthorn
Swinburne University of Technology
Davis, Tamara M.
Australia, Brisbane
The University of Queensland
Drinkwater, Michael J.
Australia, Brisbane
The University of Queensland
Forster, Karl G.
United States, Pasadena
California Institute of Technology
Gilbank, David G.
South Africa, Cape Town
South African Astronomical Observatory
Gladders, Michael D.
United States, Chicago
The Department of Astronomy and Astrophysics, the University of Chicago
Glazebrook, Karl G.
Australia, Hawthorn
Swinburne University of Technology
Jelliffe, Ben
Australia, Sydney
The University of Sydney
Jurek, Russell J.
Australia, Sydney
Australia Telescope National Facility
Li, I. Hui
Canada, Toronto
University of Toronto
Madore, Barry F.
United States, Pasadena
Carnegie Observatories
Martin, Dirk Christopher
United States, Pasadena
California Institute of Technology
Pimbblet, Kevin A.
Australia, Clayton
Monash University
United Kingdom, Hull
University of Hull
Poole, Gregory B.
Australia, Hawthorn
Swinburne University of Technology
Australia, Melbourne
School of Physics
Pracy, Michael B.
Australia, Hawthorn
Swinburne University of Technology
Australia, Sydney
The University of Sydney
Sharp, Rob G.
Australia, Melbourne
School of Physics
Australia, Canberra
The Australian National University
Wisnioski, Emily
Australia, Hawthorn
Swinburne University of Technology
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Woods, David
Canada, Vancouver
The University of British Columbia
Wyder, Ted K.
United States, Pasadena
California Institute of Technology
Yee, Howard K.C.
Canada, Toronto
University of Toronto
Statistics
Citations: 262
Authors: 29
Affiliations: 19
Identifiers
Doi:
10.1093/mnras/stu778
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative