%0 Generic %1 bielby2016redshift %A Bielby, R. M. %A Shanks, T. %A Crighton, N. H. M. %A Bornancini, C. G. %A Infante, L. %A Lambas, D. G. %A Minniti, D. %A Morris, S. L. %A Tummuangpak, P. %D 2016 %K Lya correlation galaxy %T The VLT LBG Redshift Survey - VI. Mapping HI in the proximity of $z\sim3$ LBGs with X-Shooter %U http://arxiv.org/abs/1610.09144 %X We present an analysis of the spatial distribution of gas and galaxies using new X-Shooter observations of $z\sim3-4$ quasars. Adding the X-Shooter data to an existing dataset of high resolution quasar spectroscopy, we use a total sample of 29 quasars alongside $\sim1700$ Lyman Break Galaxies in the redshift range $2<z<3.5$. Analysing the Ly$\alpha$ forest auto-correlation function using the full quasar sample, we find $s_0=0.081\pm0.006h^-1$Mpc. We then investigate the clustering and dynamics of Ly$\alpha$ forest absorbers around $z\sim3$ LBGs. From the redshift-space cross-correlation, we find $s_0=0.27\pm0.14h^-1$Mpc, with power-law slope $\gamma=1.1\pm0.2$. We make a first analysis of the dependence of this clustering length on absorber strength based on cuts in the sightline transmitted flux, finding a clear preference for stronger absorption features to be more strongly clustered around the galaxy population than weaker absorption features. Further, we calculate the projected correlation function, finding $r_0=0.24\pm0.04h^-1$Mpc (assuming a fixed slope $\gamma=1.1$). Taking this as the underlying real-space clustering, we fit the 2D cross-correlation function with a dynamical model incorporating the infall parameter and the peculiar velocity, finding $\beta_F=1.02\pm0.22$ and $240\pm60$ km s$^-1$ respectively. This result shows a significant detection of gas infall relative to the galaxy population, whilst the measured velocity dispersion is consistent with the velocity uncertainties on the galaxy redshifts. We evaluate the Cauchy-Schwarz inequality between the galaxy-galaxy, absorber-absorber, and galaxy-absorber correlation functions, finding a result significantly less than unity: $\xi_ag^2/(\xi_gg\xi_\rm aa)=0.25\pm0.14$, implying that galaxies and Ly$\alpha$ absorbers do not linearly trace the underlying dark matter distribution in the same way.

@misc{bielby2016redshift, abstract = {We present an analysis of the spatial distribution of gas and galaxies using new X-Shooter observations of $z\sim3-4$ quasars. Adding the X-Shooter data to an existing dataset of high resolution quasar spectroscopy, we use a total sample of 29 quasars alongside $\sim1700$ Lyman Break Galaxies in the redshift range $2<z<3.5$. Analysing the Ly$\alpha$ forest auto-correlation function using the full quasar sample, we find $s_0=0.081\pm0.006h^{-1}$Mpc. We then investigate the clustering and dynamics of Ly$\alpha$ forest absorbers around $z\sim3$ LBGs. From the redshift-space cross-correlation, we find $s_0=0.27\pm0.14h^{-1}$Mpc, with power-law slope $\gamma=1.1\pm0.2$. We make a first analysis of the dependence of this clustering length on absorber strength based on cuts in the sightline transmitted flux, finding a clear preference for stronger absorption features to be more strongly clustered around the galaxy population than weaker absorption features. Further, we calculate the projected correlation function, finding $r_0=0.24\pm0.04h^{-1}$Mpc (assuming a fixed slope $\gamma=1.1$). Taking this as the underlying real-space clustering, we fit the 2D cross-correlation function with a dynamical model incorporating the infall parameter and the peculiar velocity, finding $\beta_{\rm F}=1.02\pm0.22$ and $240\pm60$ km s$^{-1}$ respectively. This result shows a significant detection of gas infall relative to the galaxy population, whilst the measured velocity dispersion is consistent with the velocity uncertainties on the galaxy redshifts. We evaluate the Cauchy-Schwarz inequality between the galaxy-galaxy, absorber-absorber, and galaxy-absorber correlation functions, finding a result significantly less than unity: $\xi_{\rm ag}^2/(\xi_{\rm gg}\xi_{\rm aa})=0.25\pm0.14$, implying that galaxies and Ly$\alpha$ absorbers do not linearly trace the underlying dark matter distribution in the same way.}, added-at = {2016-10-31T09:32:53.000+0100}, author = {Bielby, R. M. and Shanks, T. and Crighton, N. H. M. and Bornancini, C. G. and Infante, L. and Lambas, D. G. and Minniti, D. and Morris, S. L. and Tummuangpak, P.}, biburl = {https://www.bibsonomy.org/bibtex/217a9bbe36a07b871960c8f177f71e170/miki}, description = {[1610.09144] The VLT LBG Redshift Survey - VI. Mapping HI in the proximity of $z\sim3$ LBGs with X-Shooter}, interhash = {955bce1f1e6e5edf664e0ca74c637783}, intrahash = {17a9bbe36a07b871960c8f177f71e170}, keywords = {Lya correlation galaxy}, note = {cite arxiv:1610.09144Comment: 13 pages, 14 figures, submitted to MNRAS}, timestamp = {2016-10-31T09:32:53.000+0100}, title = {The VLT LBG Redshift Survey - VI. Mapping HI in the proximity of $z\sim3$ LBGs with X-Shooter}, url = {http://arxiv.org/abs/1610.09144}, year = 2016 }