Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/230049

Title

The WiggleZ Dark Energy Survey: joint measurements of the expansion and growth history at z less than 1

Author(s)

Blake, Chris;  Brough, Sarah;  Colless, Matthew;  Contreras, Carlos;  Couch, Warrick;  Croom, Scott;  Croton, Darren;  Davis, Tamara M.;  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;  Poole, Gregory B.;  Pracy, Michael;  Sharp, Rob;  Wisnioski, Emily;  Woods, David;  Wyder, Ted K.;  Yee, H. K. C.

Abstract

We perform a joint determination of the distance–redshift relation and cosmic expansion rate at redshifts z = 0.44, 0.6 and 0.73 by combining measurements of the baryon acoustic peak and Alcock–Paczynski distortion from galaxy clustering in the WiggleZ Dark Energy Survey, using a large ensemble of mock catalogues to calculate the covariance between the measurements. We find that DA(z) = (1205 ± 114, 1380 ± 95, 1534 ± 107) Mpc and H(z) = (82.6 ± 7.8, 87.9 ± 6.1, 97.3 ± 7.0) km s−1 Mpc−1 at these three redshifts. Further combining our results with other baryon acoustic oscillation and distant supernovae data sets, we use a Monte Carlo Markov Chain technique to determine the evolution of the Hubble parameter H(z) as a stepwise function in nine redshift bins of width & 0916;z = 0.1, also marginalizing over the spatial curvature. Our measurements of H(z), which have precision better than 7 per cent in most redshift bins, are consistent with the expansion history predicted by a cosmological constant dark energy model, in which the expansion rate accelerates at redshift z < 0.7.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Monthly Notices of the Royal Astronomical Society, Vol. 425, no. 1 (Sep 2012), pp. 405-414

Publication year

2012

FOR Code(s)

0201 Astronomical and Space Sciences

Keyword(s)

Cosmic expansion;  Distance scale;  Growth rates;  Joint measurements;  Large-scale structure of Universe;  Surveys

Publisher

Wiley-Blackwell

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1111/j.1365-2966.2012.21473.x

Copyright

Copyright © 2012 The Authors. Monthly Notices of the Royal Astronomical Society copyright © 2012 RAS.

Research Projects

The last 8 billion years of cosmic evolution, Australian Research Council grant number DP0772084
The fundamental physics governing the formation of cosmic structure, Australian Research Council grant number DP1093738
The formation and structure of distant galaxies, Australian Research Council grant number LX0881951
The Centre for Allsky ASTROphysics (CAASTRO), Australian Research Council grant number CE11E0090

Peer reviewed