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29 March 2024 |
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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 | 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 = 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 | Services: | Forum | Review | PDF | Favorites |
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