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Title:
The WiggleZ Dark Energy Survey: survey design and first data release
Authors:
Drinkwater, Michael J.; Jurek, Russell J.; Blake, Chris; Woods, David; Pimbblet, Kevin A.; Glazebrook, Karl; Sharp, Rob; Pracy, Michael B.; Brough, Sarah; Colless, Matthew; Couch, Warrick J.; Croom, Scott M.; Davis, Tamara M.; Forbes, Duncan; Forster, Karl; Gilbank, David G.; Gladders, Michael; Jelliffe, Ben; Jones, Nick; Li, I.-Hui; Madore, Barry; Martin, D. Christopher; Poole, Gregory B.; Small, Todd; Wisnioski, Emily; Wyder, Ted; Yee, H. K. C.
Affiliation:
AA(Department of Physics, The University of Queensland, Brisbane, QLD 4072, Australia), AB(Department of Physics, The University of Queensland, Brisbane, QLD 4072, Australia), AC(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AD(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, B.C. V6T 1Z1, Canada; School of Physics, University of New South Wales, Sydney, NSW 2052, Australia), AE(Department of Physics, The University of Queensland, Brisbane, QLD 4072, Australia), AF(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AG(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia), AH(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia; Research School of Astronomy & Astrophysics, Australian National University, Weston Creek, ACT 2600, Australia), AI(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AJ(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia), AK(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AL(Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia), AM(Department of Physics, The University of Queensland, Brisbane, QLD 4072, Australia; Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark), AN(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AO(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA), AP(Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L 3G1, Canada), AQ(Department of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis Ave, Chicago, IL 60637, USA), AR(Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia), AS(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AT(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AU(Observatoires of the Carnegie Institute of Washington, 813 Santa Barbara St., Pasadena, CA 91101, USA), AV(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA), AW(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AX(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA), AY(Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia), AZ(California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125, USA), BA(Department of Astronomy & Astrophysics, University of Toronto, 50 St. George St., Toronto, ON M5S 3H4, Canada)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 3, pp. 1429-1452. (MNRAS Homepage)
Publication Date:
01/2010
Origin:
WILEY
Astronomy Keywords:
surveys, galaxies: high-redshift, galaxies: photometry, galaxies: starburst, cosmology: observations, ultraviolet: galaxies
DOI:
10.1111/j.1365-2966.2009.15754.x
Bibliographic Code:
2010MNRAS.401.1429D

Abstract

The WiggleZ Dark Energy Survey is a survey of 240000 emission-line galaxies in the distant Universe, measured with the AAOmega spectrograph on the 3.9-m Anglo-Australian Telescope (AAT). The primary aim of the survey is to precisely measure the scale of baryon acoustic oscillations (BAO) imprinted on the spatial distribution of these galaxies at look-back times of 4-8Gyr.

The target galaxies are selected using ultraviolet (UV) photometry from the Galaxy Evolution Explorer satellite, with a flux limit of NUV < 22.8mag. We also require that the targets are detected at optical wavelengths, specifically in the range 20.0 < r < 22.5mag. We use the Lyman break method applied to the UV colours, with additional optical colour limits, to select high-redshift galaxies. The galaxies generally have strong emission lines, permitting reliable redshift measurements in relatively short exposure times on the AAT. The median redshift of the galaxies is zmed = 0.6. The redshift range containing 90 per cent of the galaxies is 0.2 < z < 1.0.

The survey will sample a volume of ~1Gpc3 over a projected area on the sky of 1000 deg2, with an average target density of 350deg-2. Detailed forecasts indicate that the survey will measure the BAO scale to better than 2 per cent and the tangential and radial acoustic wave scales to approximately 3 and 5 per cent, respectively. Combining the WiggleZ constraints with existing cosmic microwave background measurements and the latest supernova data, the marginalized uncertainties in the cosmological model are expected to be sigma(Omegam) = 0.02 and sigma(w) = 0.07 (for a constant w model). The WiggleZ measurement of w will constitute a robust, precise and independent test of dark energy models.

This paper provides a detailed description of the survey and its design, as well as the spectroscopic observations, data reduction and redshift measurement techniques employed. It also presents an analysis of the properties of the target galaxies, including emission-line diagnostics which show that they are mostly extreme starburst galaxies, and Hubble Space Telescope images, which show that they contain a high fraction of interacting or distorted systems. In conjunction with this paper, we make a public data release of data for the first 100000 galaxies measured for the project.


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