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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 606459.0, MPI für Astronomie / Publikationen_mpia
Through thick and thin—H I absorption in cosmological simulations
Authors:Altay, G.; Theuns, T.; Schaye, J.; Crighton, N. H. M.; Dalla Vecchia, C.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astrophysical Journal Letters
Volume:737
Issue / Number:2
Audience:Not Specified
Abstract / Description:We investigate the column density distribution function of neutral hydrogen at redshift z = 3 using a cosmological simulation of galaxy formation from the OverWhelmingly Large Simulations project. The base simulation includes gravity, hydrodynamics, star formation, supernovae feedback, stellar winds, chemodynamics, and element-by-element cooling in the presence of a uniform UV background. Self-shielding and formation of molecular hydrogen are treated in post-processing, without introducing any free parameters, using an accurate reverse ray-tracing algorithm and an empirical relation between gas pressure and molecular mass fraction. The simulation reproduces the observed z = 3 abundance of Lyα forest, Lyman limit, and damped Lyα H I absorption systems probed by quasar sight lines over 10 orders of magnitude in column density. Self-shielding flattens the column density distribution for N H I > 1018 cm-2, while the transition to fully neutral gas and conversion of H I to H2 steepen it around column densities of N H I = 1020.3 cm-2 and N H I = 1021.5 cm-2, respectively.
Free Keywords:galaxies: formation; intergalactic medium; large-scale structure of universe; methods: numerical; quasars: absorption lines
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2011ApJ...737L..37A
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