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The WiggleZ Dark Energy Survey: the selection function and z = 0.6 galaxy power spectrum

Blake, Chris and Brough, Sarah and Colless, Matthew and Couch, Warrick and Croom, Scott and Davis, Tamara and Drinkwater, Michael J. and Forster, Karl and Glazebrook, Karl and Jelliffe, Ben and Jurek, Russell J. and Li, I-hui and Madore, Barry and Martin, Chris and Pimbblet, Kevin and Poole, Gregory B. and Pracy, Michael and Sharp, Rob and Wisnioski, Emily and Woods, David and Wyder, Ted (2010) The WiggleZ Dark Energy Survey: the selection function and z = 0.6 galaxy power spectrum. Monthly Notices of the Royal Astronomical Society, 406 (2). pp. 803-821. ISSN 0035-8711. doi:10.1111/j.1365-2966.2010.16747.x.

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We report one of the most accurate measurements of the three-dimensional large-scale galaxy power spectrum achieved to date, using 56 159 redshifts of bright emission-line galaxies at effective redshift z ≈ 0.6 from the WiggleZ Dark Energy Survey at the Anglo-Australian Telescope. We describe in detail how we construct the survey selection function allowing for the varying target completeness and redshift completeness. We measure the total power with an accuracy of approximately 5 per cent in wavenumber bands of Δk= 0.01 h Mpc^(−1). A model power spectrum including non-linear corrections, combined with a linear galaxy bias factor and a simple model for redshift-space distortions, provides a good fit to our data for scales k < 0.4 h Mpc^(−1). The large-scale shape of the power spectrum is consistent with the best-fitting matter and baryon densities determined by observations of the cosmic microwave background radiation. By splitting the power spectrum measurement as a function of tangential and radial wavenumbers, we delineate the characteristic imprint of peculiar velocities. We use these to determine the growth rate of structure as a function of redshift in the range 0.4 < z < 0.8, including a data point at z= 0.78 with an accuracy of 20 per cent. Our growth rate measurements are a close match to the self-consistent prediction of the Λ cold dark matter model. The WiggleZ survey data will allow a wide range of investigations into the cosmological model, cosmic expansion and growth history, topology of cosmic structure and Gaussianity of the initial conditions. Our calculation of the survey selection function will be released at a future date via our website

Item Type:Article
Related URLs:
URLURL TypeDescription
Brough, Sarah0000-0002-9796-1363
Colless, Matthew0000-0001-9552-8075
Forster, Karl0000-0001-5800-5531
Madore, Barry0000-0002-1576-1676
Martin, Chris0000-0002-8650-1644
Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 March 26. Received 2010 March 25; in original form 2009 May 11. Article first published online: 10 May 2010. We thank an anonymous referee for useful comments on the submitted version of this paper. We acknowledge financial support from the Australian Research Council through Discovery Project grants funding the positions of SB, MP, GBP and TD. SC acknowledges the support of the Australian Research Council through a QEII Fellowship. MJD thanks the Gregg Thompson Dark Energy Travel Fund for financial support. 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 cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Finally, the WiggleZ survey would not be possible without the dedicated work of the staff of the Anglo-Australian Observatory in the development and support of the AAOmega spectrograph, and the running of the AAT.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Australian Research CouncilUNSPECIFIED
Gregg Thompson Dark Energy Travel FundUNSPECIFIED
Subject Keywords:surveys; cosmological parameters; large-scale structure of Universe
Issue or Number:2
Record Number:CaltechAUTHORS:20100908-091556191
Persistent URL:
Official Citation:Blake, C., Brough, S., Colless, M., Couch, W., Croom, S., Davis, T., Drinkwater, M. J., Forster, K., Glazebrook, K., Jelliffe, B., Jurek, R. J., Li, I.-h., Madore, B., Martin, C., Pimbblet, K., Poole, G. B., Pracy, M., Sharp, R., Wisnioski, E., Woods, D. and Wyder, T. (2010), The WiggleZ Dark Energy Survey: the selection function and z= 0.6 galaxy power spectrum. Monthly Notices of the Royal Astronomical Society, 406: 803–821. doi: 10.1111/j.1365-2966.2010.16747.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19821
Deposited By: Tony Diaz
Deposited On:16 Sep 2010 22:12
Last Modified:08 Nov 2021 23:55

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