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The VLT LBG Redshift Survey - III. The clustering and dynamics of Lyman-break galaxies at z~3.

Bielby, R. and Hill, M.D. and Shanks, T. and Crighton, N.H.M. and Infante, L. and Bornancini, C.G. and Francke, H. and Héraudeau, P. and Lambas, D.G. and Metcalfe, N. and Minniti, D. and Padilla, N. and Theuns, Tom and Tummuangpak, P. and Weilbacher, P. (2013) 'The VLT LBG Redshift Survey - III. The clustering and dynamics of Lyman-break galaxies at z~3.', Monthly notices of the Royal Astronomical Society., 430 (1). pp. 425-449.


We present a catalogue of 2135 galaxy redshifts from the VLT LBG Redshift Survey (VLRS), a spectroscopic survey of z ≈ 3 galaxies in wide fields centred on background quasi-stellar objects. We have used deep optical imaging to select galaxies via the Lyman-break technique. Spectroscopy of the Lyman-break galaxies (LBGs) was then made using the Very Large Telescope (VLT) Visible Multi-Object Spectrograph (VIMOS) instrument, giving a mean redshift of z = 2.79. We analyse the clustering properties of the VLRS sample and also of the VLRS sample combined with the smaller area Keck-based survey of Steidel et al. From the semiprojected correlation function, wp(σ), for the VLRS and combined surveys, we find that the results are well fit with a single power-law model, with clustering scale lengths of r0 = 3.46 ± 0.41 and 3.83 ± 0.24 h−1 Mpc, respectively. We note that the corresponding combined ξ(r) slope is flatter than for local galaxies at γ = 1.5–1.6 rather than γ = 1.8. This flat slope is confirmed by the z–space correlation function, ξ(s), and in the range 10 < s < 100 h−1 Mpc the VLRS shows an ≈2.5σ excess over the Λ cold dark matter (ΛCDM) linear prediction. This excess may be consistent with recent evidence for non-Gaussianity in clustering results at z ≈ 1. We then analyse the LBG z–space distortions using the 2D correlation function, ξ(σ, π), finding for the combined sample a large-scale infall parameter of β = 0.38 ± 0.19 and a velocity dispersion of ⟨w2z⟩−−−−√=420+140−160kms−1. Based on our measured β, we are able to determine the gravitational growth rate, finding a value of f(z = 3) = 0.99 ± 0.50 (or fσ8 = 0.26 ± 0.13), which is the highest redshift measurement of the growth rate via galaxy clustering and is consistent with ΛCDM. Finally, we constrain the mean halo mass for the LBG population, finding that the VLRS and combined sample suggest mean halo masses of log(MDM/M⊙) = 11.57 ± 0.15 and 11.73 ± 0.07, respectively.

Item Type:Article
Keywords:Galaxies: kinematics and dynamics, Cosmology: observations, Large-scale structure of Universe.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:No date available
Date deposited:06 June 2014
Date of first online publication:March 2013
Date first made open access:No date available

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