Title 



The VLT LBG Redshift Survey : III. The clustering and dynamics of Lymanbreak galaxies at z 3
 
Author 



 
Abstract 



We present a catalogue of 2135 galaxy redshifts from the VLT LBG Redshift Survey (VLRS), a spectroscopic survey of z approximate to 3 galaxies in wide fields centred on background quasistellar objects. We have used deep optical imaging to select galaxies via the Lymanbreak technique. Spectroscopy of the Lymanbreak galaxies (LBGs) was then made using the Very Large Telescope (VLT) Visible MultiObject 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 Keckbased survey of Steidel et al. From the semiprojected correlation function, w(p)(sigma), for the VLRS and combined surveys, we find that the results are well fit with a single powerlaw model, with clustering scale lengths of r(0) = 3.46 +/ 0.41 and 3.83 +/ 0.24 h(1) Mpc, respectively. We note that the corresponding combined xi (r) slope is flatter than for local galaxies at gamma = 1.51.6 rather than gamma = 1.8. This flat slope is confirmed by the zspace correlation function, xi (s), and in the range 10 < s < 100 h(1) Mpc the VLRS shows an approximate to 2.5 sigma excess over the Lambda cold dark matter (Lambda CDM) linear prediction. This excess may be consistent with recent evidence for nonGaussianity in clustering results at z approximate to 1. We then analyse the LBG zspace distortions using the 2D correlation function, xi (sigma, pi), finding for the combined sample a largescale infall parameter of beta = 0.38 +/ 0.19 and a velocity dispersion of root w(z)(2) = 420(160)(+140) km s1. Based on our measured beta, we are able to determine the gravitational growth rate, finding a value of f(z = 3) = 0.99 +/ 0.50 (or f sigma(8) = 0.26 +/ 0.13), which is the highest redshift measurement of the growth rate via galaxy clustering and is consistent with Lambda CDM. 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/Mcircle dot) = 11.57 +/ 0.15 and 11.73 +/ 0.07, respectively.   
Language 



English
 
Source (journal) 



Monthly notices of the Royal Astronomical Society.  Oxford  
Publication 



Oxford : 2013
 
ISSN 



00358711
 
Volume/pages 



430:1(2013), p. 425449
 
ISI 



000318274500043
 
Full text (Publisher's DOI) 


  
