The environmental dependence of neutral hydrogen in the GIMIC simulations

Abstract

We use the Galaxies-Intergalactic Medium Interaction Calculation (GIMIC) cosmological hydrodynamic simulation at z=0 to study the distribution and environmental dependence of neutral hydrogen (HI) gas in the outskirts of simulated galaxies. This gas can currently be probed directly in, for example, Ly$\alpha$ absorption via the observation of background quasars. Radio facilities, such as the Square Kilometre Array, will provide a complementary probe of the diffuse HI in emission and will constrain the physics underpinning the complex interplay between accretion and feedback mechanisms which affect the intergalactic medium. We extract a sample of 488 galaxies from a re-simulation of the average cosmic density GIMIC region. We estimate the neutral hydrogen content of these galaxies and the surrounding intergalactic medium within which they reside. We investigate the average HI radial profiles by stacking the individual profiles according to both mass and environment. We find high HI column densities at large impact parameters in group environments and markedly lower HI densities for non-group galaxies. We suggest that these results likely arise from the combined effects of ram pressure stripping and tidal interactions present in group environments.

9 pages, 3 figures, MNRAS accepted

References in corpus (9)

• Chemical enrichment in cosmological, smoothed particle hydrodynamics simulations
• Cosmological Simulations of Intergalactic Medium Enrichment from Galactic Outflows
• Ram pressure stripping the hot gaseous halos of galaxies in groups and clusters
• The cold gaseous halo of NGC 891
• Damped Lyman Alpha Systems in Galaxy Formation Simulations
• X-ray coronae in simulations of disc galaxy formation
• Through Thick and Thin - HI Absorption in Cosmological Simulations
• Neutral Hydrogen Clouds in the M81/M82 Group
• Can gravitational infall energy lead to the observed velocity dispersion in DLAs?

Cited by in corpus (14)

• The EAGLE simulations: atomic hydrogen associated with galaxies
• The distribution of atomic hydrogen in EAGLE galaxies: morphologies, profiles, and HI holes
• The impact of quenching on galaxy profiles in the Simba simulation
• Constraining the HI-Halo Mass Relation From Galaxy Clustering
• The Three Hundred Project: Ram pressure and gas content of haloes and subhaloes in the phase-space plane
• The Structure of the Circumgalactic Medium of Galaxies: Cool Accretion Inflow Around NGC 1097
• The impact of environment and mergers on the HI content of galaxies in hydrodynamic simulations
• Predicting the Neutral Hydrogen Content of Galaxies From Optical Data Using Machine Learning
• The neutral hydrogen distribution in large-scale haloes from 21-cm intensity maps
• Halo models of HI selected galaxies
• Searching for HI imprints in cosmic web filaments with 21-cm intensity mapping
• Evolution of Galaxy Types and HI Gas Contents in Galaxy Groups
• Dynamic equilibrium sets atomic content of galaxies across cosmic time
• The Study of Circumgalactic Medium with Quasar Pairs