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29 March 2024
 
  » arxiv » 0901.2587

 Article overview


The WiggleZ Dark Energy Survey: small-scale clustering of Lyman Break Galaxies at z < 1
Chris Blake ; Russell Jurek ; Sarah Brough ; Matthew Colless ; Warrick Couch ; Scott Croom ; Tamara Davis ; Michael Drinkwater ; Duncan Forbes ; Karl Glazebrook ; Barry Madore ; Chris Martin ; Kevin Pimbblet ; Greg Poole ; Michael Pracy ; Rob Sharp ; Todd Small ; David Woods ;
Date 16 Jan 2009
AbstractThe WiggleZ Dark Energy Survey is a large-scale structure survey of intermediate-redshift UV-selected emission-line galaxies scheduled to cover 1000 sq deg, spanning a broad redshift range 0.2 < z < 1.0. The main scientific goal of the survey is the measurement of baryon acoustic oscillations (BAO) in the galaxy clustering pattern at a significantly higher redshift than previous studies. The BAO may be applied as a standard cosmological ruler to constrain dark energy models. Based on the first 20% of the dataset, we present initial results concerning the small-scale clustering of the WiggleZ targets, together with survey forecasts. The WiggleZ galaxy population possesses a clustering length r_0 = 5.23 +/- 0.15 Mpc/h, which is significantly larger than z=0 UV-selected samples, with a slope gamma = 1.82 +/- 0.07. This clustering length is comparable to z=3 Lyman Break Galaxies with similar UV luminosities. The full survey, scheduled for completion in 2010, will map an effective volume V_eff ~ 1 Gpc^3 (evaluated at a scale k = 0.15 h/Mpc) and will measure the angular-diameter distance and Hubble expansion rates in three redshift bins with accuracies ~ 5%. We will determine the value of a constant dark energy equation-of-state parameter, w, with a higher precision than existing supernovae observations using an entirely independent technique. The WiggleZ and supernovae measurements lie in highly complementary directions in the plane of w and the matter density Omega_m. The forecast using the full combination of WiggleZ, supernovae and CMB datasets is a marginalized error sigma(w) = 0.07, providing a robust and precise measurement of the properties of dark energy including cross-checking of systematic errors.
Source arXiv, 0901.2587
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