The WiggleZ Dark Energy Survey: small-scale clustering of Lyman Break Galaxies at z < 1
arXiv:0901.2587 · doi:10.1111/j.1365-2966.2009.14447.x
Abstract
The 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 = 4.40 +/- 0.12 Mpc/h, which is significantly larger than z=0 UV-selected samples, with a slope gamma = 1.92 +/- 0.08. 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.
17 pages, 20 figures, accepted by MNRAS
References in corpus (12)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
- Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
- Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
- The Gemini Deep Deep Survey: III. The abundance of massive galaxies 3-6 billion years after the Big Bang
- The DEEP2 Galaxy Redshift Survey: Color and Luminosity Dependence of Galaxy Clustering at z~1
- Definitive Identification of the Transition between Small- to Large-Scale Clustering for Lyman Break Galaxies
- Optimising Baryon Acoustic Oscillation Surveys - I: Testing the concordance LCDM cosmology
- Clustering Properties of restframe UV selected galaxies II: Migration of Star Formation sites with cosmic time from GALEX and CFHTLS
- The Subaru/XMM-Newton Deep Survey (SXDS) -VII. Clustering Segregation with Ultraviolet and Optical Luminosities of Lyman-Break Galaxies at z~3
- Clustering Properties of restframe UV selected galaxies I: the correlation length derived from GALEX data in the local Universe