The VLT LBG redshift survey - VI. Mapping HI in the proximity of z ~ 3 LBGs with X-Shooter

Authors
Bielby, R.M.; Shanks, T.; Crighton, N. H. M.; Bornancini, Carlos Guillermo; Infante, L.; Garcia Lambas, Diego Rodolfo; Minniti, D.; Morris, S.L.; Tummuangpak, P.
Publication Year
2017
Language
English
Format
article
Status
Published version
Description
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 crossclustering 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.
Fil: Bielby, R.M.. University of Durham; Reino Unido
Fil: Shanks, T.. University of Durham; Reino Unido
Fil: Crighton, N. H. M.. Swinburne University; Australia
Fil: Bornancini, Carlos Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Infante, L.. Pontificia Universidad Católica de Chile; Chile
Fil: Garcia Lambas, Diego Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Minniti, D.. Universidad Andrés Bello; Chile
Fil: Morris, S.L.. University of Durham; Reino Unido
Fil: Tummuangpak, P.. Khon Kaen University; Tailandia
Subject
COSMOLOGY: OBSERVATIONS
GALAXIES: KINEMATICS AND DYNAMICS
INTERGALACTIC MEDIUM
LARGE-SCALE STRUCTURE OF UNIVERSE
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Open access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/64547