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The WiggleZ Dark Energy Survey: measuring the cosmic growth rate with the two-point galaxy correlation function

Contreras, Carlos and Forster, Karl and Martin, D. Christopher and Wyder, Ted K. (2013) The WiggleZ Dark Energy Survey: measuring the cosmic growth rate with the two-point galaxy correlation function. Monthly Notices of the Royal Astronomical Society, 430 (2). pp. 924-933. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20130613-091253896

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Abstract

The growth history of large-scale structure in the Universe is a powerful probe of the cosmological model, including the nature of dark energy. We study the growth rate of cosmic structure to redshift z = 0.9 using more than 162 000 galaxy redshifts from the WiggleZ Dark Energy Survey. We divide the data into four redshift slices with effective redshifts z = [0.2, 0.4, 0.6, 0.76] and in each of the samples measure and model the two-point galaxy correlation function in parallel and transverse directions to the line of sight. After simultaneously fitting for the galaxy bias factor we recover values for the cosmic growth rate which are consistent with our assumed Λcold dark matter (ΛCDM) input cosmological model, with an accuracy of around 20 per cent in each redshift slice. We investigate the sensitivity of our results to the details of the assumed model and the range of physical scales fitted, making close comparison with a set of N-body simulations for calibration. Our measurements are consistent with an independent power-spectrum analysis of a similar data set, demonstrating that the results are not driven by systematic errors. We determine the pairwise velocity dispersion of the sample in a non-parametric manner, showing that it systematically increases with decreasing redshift, and investigate the Alcock–Paczynski effects of changing the assumed fiducial model on the results. Our techniques should prove useful for current and future galaxy surveys mapping the growth rate of structure using the two-dimensional correlation function.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnras/sts608DOIUNSPECIFIED
http://mnras.oxfordjournals.org/content/430/2/924PublisherUNSPECIFIED
Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. First published online: February 7, 2013. We acknowledge financial support from the Australian Research Council through Discovery Project grants which have funded the positions of MP, GP, TD and FM. SMC acknowledges the support of the Australian Research Council through a QEII Fellowship. MJD and TD thank the Gregg Thompson Dark Energy Travel Fund for financial support. CC thanks David Parkinson for sharing his expertise on MCMC techniques, and Ana María Martínez for her invaluable feedback and support in the building of this paper. GALEX is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for construction, operation and science analysis for the GALEX mission, developed in co-operation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Finally, the WiggleZ survey would not have been possible without the dedicated work of the staff of the Australian Astronomical Observatory in the development and support of the AAOmega spectrograph, and the running of the AAT. This research was supported by CAASTRO: http://caastro.org.
Group:Space Astrophysics Laboratory
Funders:
Funding AgencyGrant Number
Australian Research Council Discovery Project grantsUNSPECIFIED
Australian Research Council QEII FellowshipUNSPECIFIED
Gregg Thompson Dark Energy Travel Fund UNSPECIFIED
NASAUNSPECIFIED
CAASTROUNSPECIFIED
Subject Keywords: surveys cosmological parameters large-scale structure of Universe
Record Number:CaltechAUTHORS:20130613-091253896
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130613-091253896
Official Citation: Carlos Contreras, Chris Blake, Gregory B. Poole, Felipe Marin, Sarah Brough, Matthew Colless, Warrick Couch, Scott Croom, Darren 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, Michael Pracy, Rob Sharp, Emily Wisnioski, David Woods, Ted K. Wyder, and H. K. C. Yee The WiggleZ Dark Energy Survey: measuring the cosmic growth rate with the two-point galaxy correlation function MNRAS (April 1, 2013) Vol. 430 924-933 first published online February 7, 2013 doi:10.1093/mnras/sts608
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38936
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Jun 2013 16:29
Last Modified:28 Aug 2016 20:17

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