Modelling intergalactic low ionisation metal absorption line systems near the epoch of reionization

Abstract

We interpret observations of intergalactic low ionisation metal absorption systems at redshifts z $\gtrsim$5 in terms of pressure-confined clouds. We find clouds confined by the expected pressure of galactic haloes with masses $11<\log M_h/h^{-1}{M}_{\odot }<12$ provide a good description of the column density ratios between low ionisation metal absorbers. Some of the ratios, however, require extending conventional radiative transfer models of irradiated slabs to spherical (or cylindrical) clouds to allow for lines of sight passing outside the cores of the clouds. Moderate depletion of silicon onto dust grains is also indicated in some systems. The chemical abundances inferred span the range between solar and massive-star dominated stellar populations as may arise in starburst galaxies. The typical HI column densities matching the data correspond to Damped Lyman-$\alpha$ Absorbers (DLAs) or sub-DLAs, with sizes of 40 pc to 3 kpc, gas masses $3.5<\log M_c/M_{\odot }<8$ and metallicites $0.001-0.01Z_{\odot }$. Such systems continue to pose a challenge for galaxy-scale numerical simulations to reproduce.

arXiv comment19 pages, 10 figures, 12 Tables, submitted to MNRAS, comments welcome

References in corpus (65)

• Astropy: A Community Python Package for Astronomy
• The epochs of early-type galaxy formation as a function of environment
• Physical Models of Galaxy Formation in a Cosmological Framework
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy
• The Circumgalactic Medium
• Damped Lyman alpha Systems
• The Pan-STARRS1 Surveys
• Nucleosynthetic signatures of the first stars
• A stellar relic from the early Milky Way
• Reionization after Planck: The Derived Growth of the Cosmic Ionizing Emissivity now matches the Growth of the Galaxy UV Luminosity Density
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• The Ages of Elliptical Galaxies in a Merger Model
• The Universe is Reionizing at z~7: Bayesian Inference of the IGM Neutral Fraction Using Ly$\alpha$ Emission from Galaxies
• The Evolution of the Intergalactic Medium
• Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction
• Faint AGNs at z>4 in the CANDELS GOODS-S field: looking for contributors to the reionization of the Universe
• Metallicity Evolution of Damped Lyman-alpha Systems out to z~5
• Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7
• The Metallicity of High Redshift Galaxies: The Abundance of Zinc in 34 Damped Lyman Alpha Systems from z = 0.7 to 3.4
• Early-Type Galaxy Archeology: Ages, Abundance Ratios, and Effective Temperatures from Full-Spectrum Fitting
• Figuring Out Gas & Galaxies in Enzo (FOGGIE). I. Resolving Simulated Circumgalactic Absorption at 2 < z < 2.5
• HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
• Cosmological simulations of the circumgalactic medium with 1 kpc resolution: enhanced HI column densities
• Probing the Formation of the First Low-Mass Stars with Stellar Archaeology
• New constraints on Lyman-α opacity with a sample of 62 quasars at z > 5.7
• Consistent modelling of the meta-galactic UV background and the thermal/ionization history of the intergalactic medium
• The most metal-poor damped Lyman-alpha systems: Insights into chemical evolution in the very metal-poor regime
• Shaping the galaxy stellar mass function with supernova- and AGN-driven winds
• The Sherwood simulation suite: overview and data comparisons with the Lyman-alpha forest at redshifts 2 < z < 5
• Gaseous Galactic Halos and QSO Absorption Line Systems
• The survival of gas clouds in the Circumgalactic Medium of Milky Way-like galaxies
• Are we witnessing the epoch of reionisation at $z=7.1$ from the spectrum of J1120+0641?
• The large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest: First Measurements from BOSS
• A downturn in intergalactic CIV as redshift 6 is approached
• The ESI/KeckII Damped Lya Abundance Database
• The intergalactic medium over the last 10 billion years II: Metal-line absorption and physical conditions
• Quasars Probing Quasars III: New Clues to Feedback, Quenching, and the Physics of Massive Galaxy Formation
• Zn and Cr abundances in damped Lyman alpha systems from the CORALS survey
• The Impact of Galactic Feedback on the Circumgalactic Medium
• Metals in the IGM approaching the re-ionization epoch: results from X-shooter at the VLT
• The physics of multiphase gas flows: fragmentation of a radiatively cooling gas cloud in a hot wind
• The cosmic evolution of dust-corrected metallicity in the neutral gas
• The oldest and most metal poor stars in the APOSTLE Local Group simulations
• High-Redshift Metals. II. Probing Reionization Galaxies with Low-Ionization Absorption Lines at Redshift Six
• The Evolution of O I over 3.2 < z < 6.5: Reionization of the Circumgalactic Medium
• Iron and alpha-element Production in the First One Billion Years after the Big Bang
• A comparison of observed and simulated absorption from HI, CIV, and SiIV around $z\approx 2$ star-forming galaxies suggests redshift-space distortions are due to inflows
• The most metal-poor damped Lyman alpha systems: An insight into dwarf galaxies at high redshift
• The nature of proximate damped Lyman alpha systems
• Heavy Element Absorption Systems at $5.0<z<6.8$: Metal-Poor Neutral Gas and a Diminishing Signature of Highly Ionized Circumgalactic Matter
• The origin of the $\alpha$-enhancement of massive galaxies
• Witnessing galaxy assembly at the edge of the reionization epoch
• Mg II absorbers: metallicity evolution and cloud morphology
• A metal-poor damped Ly-alpha system at redshift 6.4
• A deep search for metals near redshift 7: the line-of-sight towards ULAS J1120+0641
• The bias of DLAs at z ~ 2.3: contraining stellar feedback in shallow potential wells
• Elemental Abundances in Two High Column Density Damped Lyman Alpha Systems at z < 1.5
• The CGM and IGM at z$\sim$5: metal budget and physical connection
• Exploring the Physical Properties of the Cool Circumgalactic Medium with a Semi-Analytic Model
• Early metal enrichment of gas-rich galaxies at z~5
• Element Abundances in a Gas-rich Galaxy at z = 5: Clues to the Early Chemical Enrichment of Galaxies
• Gas around galaxy haloes - III: hydrogen absorption signatures around galaxies and QSOs in the Sherwood simulation suite
• Metal-enriched Galaxies in the First ~1 Billion Years: Evidence of a Smooth Metallicity Evolution at z ~ 5
• Bursty star formation feedback and cooling outflows