The VLT LBG redshift survey – VI. Mapping H i in the proximity of z ∼ 3 LBGs with X-Shooter
Bielby, R.M.; Shanks, T.; Crighton, N.H.M.; Bornancini, C.G.; Infante, L.; Lambas, D.G.; Minniti, D.; Morris, S.L.; Tummuangpak, P.
Professor Simon Morris firstname.lastname@example.org
We present an analysis of the spatial distribution and dynamics of neutral hydrogen gas around galaxies using new X-Shooter observations of z ∼ 2.5–4 quasars. Adding the X-Shooter data to our existing data set of high-resolution quasar spectroscopy, we use a total sample of 29 quasars alongside ∼1700 Lyman Break Galaxies (LBGs) in the redshift range 2 ≲ z ≲ 3.5. We measure the Lyα forest auto-correlation function, finding a clustering length of s0 = 0.081 ± 0.006 h−1 Mpc, and the cross-correlation function with LBGs, finding a cross-clustering length of s0 = 0.27 ± 0.14 h−1 Mpc and power-law slope γ = 1.1 ± 0.2. Our results highlight the weakly clustered nature of neutral hydrogren systems in the Lyα forest. Building on this, we make a first analysis of the dependence of the clustering on absorber strength, finding a clear preference for stronger Lyα forest absorption features to be more strongly clustered around the galaxy population, suggesting that they trace on average higher mass haloes. Using the projected and 2-D cross-correlation functions, we constrain the dynamics of Lyα forest clouds around z ∼ 3 galaxies. We find a significant detection of large-scale infall of neutral hydrogen, with a constraint on the Lyα forest infall parameter of βF = 1.02 ± 0.22.
Bielby, R., Shanks, T., Crighton, N., Bornancini, C., Infante, L., Lambas, D., …Tummuangpak, P. (2017). The VLT LBG redshift survey – VI. Mapping H i in the proximity of z ∼ 3 LBGs with X-Shooter. Monthly Notices of the Royal Astronomical Society, 471(2), 2174-2186. https://doi.org/10.1093/mnras/stx1772
|Journal Article Type||Article|
|Acceptance Date||Jul 12, 2017|
|Online Publication Date||Jul 14, 2017|
|Publication Date||Jul 14, 2017|
|Deposit Date||Aug 31, 2017|
|Publicly Available Date||Sep 5, 2017|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Publisher||Royal Astronomical Society|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors.<br /> Published by Oxford University Press on behalf of the Royal Astronomical Society.
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