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The WiggleZ Dark Energy Survey: improved distance measurements to z = 1 with reconstruction of the baryonic acoustic feature

Kazin, Eyal A. and Forster, Karl and Martin, D. Christopher and Wyder, Ted K. (2014) 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, 441 (4). pp. 3524-3542. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20140811-091252086

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Abstract

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 D_V(r_s^(fid)/r_s) of 1716 ± 83, 2221 ± 101, 2516 ± 86 Mpc (68 per cent CL) at effective redshifts z = 0.44, 0.6, 0.73, respectively, where D_V is the volume-averaged distance, and r_s 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 D_V(r_s^(fid)/r_s) 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 H_0 = 67.15 ± 0.98 km s^(−1)Mpc^(−1). Allowing the equation of state of dark energy to vary, we obtain w_(DE) = −1.080 ± 0.135. When assuming a curved ΛCDM model we obtain a curvature value of Ω_K = −0.0043 ± 0.0047.


Item Type:Article
Related URLs:
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http://mnras.oxfordjournals.org/content/441/4/3524.abstractPublisherArticle
http://dx.doi.org/10.1093/mnras/stu778DOIArticle
Additional Information:© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 April 17. Received 2014 March 14. In original form 2013 December 31. First published online June 1, 2014. We thank Florian Beutler, Daniel Eisenstein, Shahab Joudaki, Antony Lewis, Felipe Marin and Ariel Sanchez for useful discussions. EK and JK are supported by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. CB acknowledges the support of the Australian Research Council through the award of a Future Fellowship. TMD acknowledges the support of the Australian Research Council through a Future Fellowship award, FT100100595. The numerical simulation was supported by the SwinSTAR supercomputer at Swinburne University of Technology and the Raijin supercomputer through the Flagship Allocation Scheme of the NCI National Facility at the ANU.
Group:Space Astrophysics Laboratory
Funders:
Funding AgencyGrant Number
Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)CE110001020
Australian Research CouncilFT100100595
Subject Keywords: cosmological parameters distance scale large-scale structure of the universe
Record Number:CaltechAUTHORS:20140811-091252086
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140811-091252086
Official Citation:Eyal A. Kazin, Jun Koda, Chris Blake, Nikhil Padmanabhan, Sarah Brough, Matthew Colless, Carlos Contreras, Warrick Couch, Scott Croom, Darren J. Croton, Tamara M. Davis, Michael J. Drinkwater, Karl Forster, David Gilbank, Mike Gladders, Karl Glazebrook, Ben Jelliffe, Russell J. Jurek, I-hui Li, Barry Madore, D. Christopher Martin, Kevin Pimbblet, Gregory B. Poole, Michael Pracy, Rob Sharp, Emily Wisnioski, David Woods, Ted K. Wyder, and H. K. C. Yee The WiggleZ Dark Energy Survey: improved distance measurements to z = 1 with reconstruction of the baryonic acoustic feature MNRAS (July 11, 2014) Vol. 441 3524-3542 First published online June 1, 2014, doi:10.1093/mnras/stu778
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48288
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 Aug 2014 16:34
Last Modified:26 Aug 2016 22:23

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