Reproducing the Kinematics of Damped Lyman-alpha Systems

Abstract

We examine the kinematic structure of Damped Lyman-alpha Systems (DLAs) in a series of cosmological hydrodynamic simulations using the AREPO code. We are able to match the distribution of velocity widths of associated low ionisation metal absorbers substantially better than earlier work. Our simulations produce a population of DLAs dominated by halos with virial velocities around 70 km/s, consistent with a picture of relatively small, faint objects. In addition, we reproduce the observed correlation between velocity width and metallicity and the equivalent width distribution of SiII. Some discrepancies of moderate statistical significance remain; too many of our spectra show absorption concentrated at the edge of the profile and there are slight differences in the exact shape of the velocity width distribution. We show that the improvement over previous work is mostly due to our strong feedback from star formation and our detailed modelling of the metal ionisation state.

14 pages, 13 figures, minor changes to match version accepted by MNRAS

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• The THESAN project: properties of the intergalactic medium and its connection to Reionization-era galaxies
• Damped Lyman-alpha absorbers as a probe of stellar feedback
• The Impact of Galactic Feedback on the Circumgalactic Medium
• The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest
• The CAMELS project: public data release
• Galaxy mergers moulding the circum-galactic medium - I. The impact of a major merger
• Statistical properties of damped Lyman-alpha systems from Sloan Digital Sky Survey DR12
• A study of the circum-galactic medium at z ~ 0.6 using DLA-galaxies
• [CII] 158 Micron Emission from z~4 HI Absorption-Selected Galaxies
• Linking gas and galaxies at high redshift: MUSE surveys the environments of six damped Lyman alpha galaxies at z~3
• On the mass-metallicity relation, velocity dispersion and gravitational well depth of GRB host galaxies
• Simulating the effect of high column density absorbers on the one-dimensional Lyman-alpha forest flux power spectrum
• The Effect Of AGN Heating On The Low-Redshift Lyα Forest
• Damped Lyman-alpha Absorbers from Sloan Digital Sky Survey DR16Q with Gaussian processes
• The effect of dust bias on the census of neutral gas and metals in the high-redshift Universe due to SDSS-II quasar colour selection
• PRIYA: A New Suite of Lyman-alpha Forest Simulations for Cosmology
• The ACCELERATION programme: I. Cosmology with the redshift drift
• Cosmological Constraints from the eBOSS Lyman-$\alpha$ Forest using the PRIYA Simulations
• A population of ultraviolet-dim protoclusters detected in absorption
• Characterizing Protoclusters and Protogroups at z $\sim$ 2.5 Using Ly$\alpha$ Tomography
• The diversity of the circumgalactic medium around z = 0 Milky Way-mass galaxies from the Auriga simulations
• Efficient long-range AGN feedback affects the low redshift Lyman-$\alpha$ forest
• Connecting cosmological accretion to strong Lyman-alpha absorbers
• Redshift space distortions of the {\rm HI} 21-cm intensity mapping signal due to the internal motions within galaxies
• The low redshift Lyman-$\alpha$ Forest as a constraint for models of AGN feedback
• Simulated metal and HI absorption lines at the conclusion of Reionization
• ALMA [CII] 158um imaging of an HI-Selected Major Merger at z~4
• High-redshift Damped Ly-alpha Absorbing Galaxy Model Reproducing the N(HI)-Z Distribution
• The Ly$\alpha$ emission from high-$z$ galaxies hosting strong Damped Ly$\alpha$ systems
• Planting a Lyman alpha forest on AbacusSummit
• Testing Galaxy Formation Simulations with Damped Lyman-$\alpha$ Abundance and Metallicity Evolution
• A Multi-Fidelity Emulator for the Lyman-$\alpha$ Forest Flux Power Spectrum
• Probing the assembly of dwarf galaxies through cosmic time with damped Lyman-$\alpha$ absorption spectroscopy
• Damped Lyman-$\alpha$ absorbers and atomic hydrogen in galaxies: the view of the GAEA model
• Properties of the circumgalactic medium in simulations compared to observations
• X-ray Absorption Lines in the Warm-Hot Intergalactic Medium: Probing Chandra observations with the CAMEL simulations
• Using Machine Learning to Find Ghostly Damped Ly$\alpha$ Systems in SDSS DR14
• Boosting Line Intensity Map Signal-to-Noise with the Ly-$\alpha$ Forest Cross-Correlation
• Densified pupil spectrograph as high-precision radial velocimetry: From direct measurement of the Universe's expansion history to characterization of nearby habitable planet candidates