Atomic and molecular gas in IllustrisTNG galaxies at low redshift

Abstract

We have recently developed a post-processing framework to estimate the abundance of atomic and molecular hydrogen (HI and H2, respectively) in galaxies in large-volume cosmological simulations. Here we compare the HI and H2 content of IllustrisTNG galaxies to observations. We mostly restrict this comparison to $z\approx 0$ and consider six observational metrics: the overall abundance of HI and H2, their mass functions, gas fractions as a function of stellar mass, the correlation between H2 and star formation rate, the spatial distribution of gas, and the correlation between gas content and morphology. We find generally good agreement between simulations and observations, particularly for the gas fractions and the HI mass-size relation. The H2 mass correlates with star formation rate as expected, revealing an almost constant depletion time that evolves up to z = 2 as observed. However, we also discover a number of tensions with varying degrees of significance, including an overestimate of the total neutral gas abundance at z = 0 by about a factor of two and a possible excess of satellites with no or very little neutral gas. These conclusions are robust to the modelling of the HI/H2 transition. In terms of their neutral gas properties, the IllustrisTNG simulations represent an enormous improvement over the original Illustris run. All data used in this paper are publicly available as part of the IllustrisTNG data release.

22 pages, 11 figures. Additional figures and link to data at http://www.benediktdiemer.com/data/hi-h2-in-illustris/

References in corpus (192)

• Planck 2015 results. XIII. Cosmological parameters
• Galactic Stellar and Substellar Initial Mass Function
• The Global Schmidt Law in Star Forming Galaxies
• Cosmic Star Formation History
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Populating a cluster of galaxies - I. Results at z=0
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• The CO-to-H2 Conversion Factor
• Simulating Galaxy Formation with the IllustrisTNG Model
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• Physical Models of Galaxy Formation in a Cosmological Framework
• Properties of galaxies reproduced by a hydrodynamic simulation
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• Simulating galaxy formation with black hole driven thermal and kinetic feedback
• CALIFA, the Calar Alto Legacy Integral Field Area survey: I. Survey presentation
• Simba: Cosmological Simulations with Black Hole Growth and Feedback
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• Introducing the Illustris Project: the evolution of galaxy populations across cosmic time
• First Results from the TNG50 Simulation: Galactic outflows driven by supernovae and black hole feedback
• High molecular gas fractions in normal massive star forming galaxies in the young Universe
• A model for cosmological simulations of galaxy formation physics
• A Study of the Gas-Star Formation Relation over Cosmic Time
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• Dancing in the dark: galactic properties trace spin swings along the cosmic web
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• The physics driving the cosmic star formation history
• A New Non-Parametric Approach to Galaxy Morphological Classification
• The Arecibo Legacy Fast ALFA Survey: I. Science Goals, Survey Design and Strategy
• The merger rate of galaxies in the Illustris Simulation: a comparison with observations and semi-empirical models
• Different star formation laws for disks versus starbursts at low and high redshifts
• The Dark Molecular Gas
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• A New Calculation of the Ionizing Background Spectrum and the Effects of HeII Reionization
• The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
• Molecular Gas and Star Formation in Nearby Disk Galaxies
• HERACLES: The HERA CO-Line Extragalactic Survey
• The Illustris simulation: the evolving population of black holes across cosmic time
• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• Galaxy Clustering in Early SDSS Redshift Data
• The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
• The CO-to-H2 Conversion Factor From Infrared Dust Emission Across the Local Group
• Updated Nearby Galaxy Catalog
• The Evolution of the Stellar Mass Function of Galaxies from z=4.0 and the First Comprehensive Analysis of its Uncertainties: Evidence for Mass-dependent Evolution
• xCOLD GASS: the complete IRAM-30m legacy survey of molecular gas for galaxy evolution studies
• COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies: I. Relations between H2, HI, stellar content and structural properties
• On the evolution of the HI column density distribution in cosmological simulations
• The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic HI Source Catalog
• COLOSSUS: A python toolkit for cosmology, large-scale structure, and dark matter halos
• Supermassive black holes and their feedback effects in the IllustrisTNG simulation
• The optical morphologies of galaxies in the IllustrisTNG simulation: a comparison to Pan-STARRS observations
• The Star Formation Law in Atomic and Molecular Gas
• The GALEX Arecibo SDSS Survey. I. Gas Fraction Scaling Relations of Massive Galaxies and First Data Release
• The HIPASS catalogue: Omega_HI and environmental effects on the HI mass function of galaxies
• A Constant Molecular Gas Depletion Time in Nearby Disk Galaxies
• The Atlas3D project -- XIII. Mass and morphology of HI in early-type galaxies as a function of environment
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• xGASS: Total cold gas scaling relations and molecular-to-atomic gas ratios of galaxies in the local Universe
• The SDSS Damped Lya Survey: Data Release 3
• COLD GASS, an IRAM Legacy Survey of Molecular Gas in Massive Galaxies: II. The non-universality of the Molecular Gas Depletion Timescale
• A General Model for the CO-H2 Conversion Factor in Galaxies with Applications to the Star Formation Law
• Structural and Photometric Classification of Galaxies - I. Calibration Based on a Nearby Galaxy Sample
• Evolution of Interstellar Medium, Star Formation, and Accretion at High Redshift
• The Ursa Major Cluster of Galaxies. IV ; HI synthesis observations
• MUFASA: Galaxy Formation Simulations With Meshless Hydrodynamics
• Column density distribution and cosmological mass density of neutral gas: Sloan Digital Sky Survey-III Data Release 9
• Model-independent insights into the nature of the Lyman-alpha forest and the distribution of matter in the universe
• A physical model for cosmological simulations of galaxy formation: multi-epoch validation
• A FUSE Survey of Interstellar Molecular Hydrogen in Translucent Clouds
• Stellar mass -- halo mass relation and star formation efficiency in high-mass halos
• The Arecibo Legacy Fast ALFA Survey: X. The HI Mass Function and Omega_HI From the 40% ALFALFA Survey
• The massive end of the luminosity and stellar mass functions: Dependence on the fit to the light profile
• The Size Evolution of Star-forming and Quenched Galaxies in the IllustrisTNG simulation
• The Herschel Reference Survey
• The star-formation activity of IllustrisTNG galaxies: main sequence, UVJ diagram, quenched fractions, and systematics
• Evolution of the cosmological mass density of neutral gas from Sloan Digital Sky Survey II - Data Release 7
• The Arecibo Legacy Fast ALFA Survey: The Galaxy Population Detected by ALFALFA
• The BIMA Survey of Nearby Galaxies (BIMA SONG): I. The Radial Distribution of CO Emission in Spiral Galaxies
• New Lessons from the HI Size-Mass Relation of Galaxies
• On the Relationship Between Molecular Hydrogen and Carbon Monoxide Abundances in Molecular Clouds
• CALIFA: a diameter-selected sample for an integral field spectroscopy galaxy survey
• The Baryon Content of Extremely Low Mass Dwarf Galaxies
• The impact of interactions, bars, bulges, and AGN on star formation efficiency in local massive galaxies
• The star formation main sequence and stellar mass assembly of galaxies in the Illustris simulation
• Cold gas stripping in satellite galaxies: from pairs to clusters
• ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Survey Description
• The Atlas3D project - XIV. The extent and kinematics of molecular gas in early-type galaxies
• Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies
• The GALEX Arecibo SDSS Survey. VIII. Final Data Release -- The Effect of Group Environment on the Gas Content of Massive Galaxies
• The evolution of the mass-metallicity relation in IllustrisTNG
• HI-to-H2 Transitions and H I Column Densities in Galaxy Star-Forming Regions
• Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence
• The effect of the environment on the HI scaling relations
• A FUSE Survey of Interstellar Molecular Hydrogen in the Small and Large Magellanic Clouds
• Revisiting the Hubble sequence in the SDSS DR7 spectroscopic sample: a publicly available bayesian automated classification
• Very extended cold gas, star formation and outflows in the halo of a bright QSO at z>6
• Spectrophotometry of nearby field galaxies: the data
• Galaxy Morphology and Star Formation in the Illustris Simulation at z=0
• The role of mergers and halo spin in shaping galaxy morphology
• Ingredients for 21cm intensity mapping
• Evolution of the atomic and molecular gas content of galaxies
• HI holes and high-velocity clouds in the spiral galaxy NGC 6946
• The abundance, distribution, and physical nature of highly ionized oxygen OVI, OVII, and OVIII in IllustrisTNG
• Cold gas properties of the Herschel Reference Survey. II. Molecular and total gas scaling relations
• Consistent modelling of the meta-galactic UV background and the thermal/ionization history of the intergalactic medium
• The EDGE-CALIFA Survey: Interferometric Observations of 126 Galaxies with CARMA
• The ALFALFA HI mass function: A dichotomy in the low-mass slope and a locally suppressed 'knee' mass
• Cold gas properties of the Herschel Reference Survey. III. Molecular gas stripping in cluster galaxies
• The ESO UVES Advanced Data Products Quasar Sample - II. Cosmological Evolution of the Neutral Gas Mass Density
• The HI content of star-forming galaxies at z = 0.24
• How well can we really estimate the stellar masses of galaxies from broadband photometry?
• The CO-H2 Conversion Factor in Disc Galaxies and Mergers
• The Star Formation Law in Molecule-Poor Galaxies
• What Shapes the Galaxy Mass Function? Exploring the Roles of Supernova-Driven Winds and AGN
• COLDz: Shape of the CO Luminosity Function at High Redshift and the Cold Gas History of the Universe
• The EAGLE simulations: atomic hydrogen associated with galaxies
• CO Luminosity Functions For FIR and B-band Selected Galaxies and the First Estimate for Omega_{HI+H2}
• Cold gas properties of the Herschel Reference Survey. I. 12CO(1-0) and HI data
• Jellyfish galaxies with the IllustrisTNG simulations: I. Gas-stripping phenomena in the full cosmological context
• Detection of HI in distant galaxies using spectral stacking
• Cosmological evolution of atomic gas and implications for 21 cm HI absorption
• Surface photometry of nearby field galaxies: the data
• The distribution of atomic hydrogen in EAGLE galaxies: morphologies, profiles, and HI holes
• An observational and theoretical view of the radial distribution of HI gas in galaxies
• ALMA spectroscopic survey in the Hubble Ultra Deep Field: CO luminosity functions and the evolution of the cosmic density of molecular gas
• Damped Lyman-alpha absorbers as a probe of stellar feedback
• A New Method to Correct for Fiber Collisions in Galaxy Two-Point Statistics
• Understanding the H2/HI Ratio in Galaxies
• The X-factor in Galaxies: I. Dependence on Environment and Scale
• Modeling the atomic-to-molecular transition in cosmological simulations of galaxy formation
• PHIBSS2: survey design and z=0.5-0.8 results. Molecular gas reservoirs during the winding-down of star formation
• Gas, Stars and Star Formation in ALFALFA Dwarf Galaxies
• Similar star formation rate and metallicity evolution timescales drive the fundamental metallicity relation
• The Effect of Structure and Star Formation on the Gas Content of Nearby Galaxies
• ALLSMOG: an APEX Low-redshift Legacy Survey for MOlecular Gas. I - molecular gas scaling relations, and the effect of the CO/H2 conversion factor
• Stochastic modeling of star-formation histories I: the scatter of the star-forming main sequence
• A Study in Blue: The Baryon Content of Isolated Low Mass Galaxies
• The impact of local stellar radiation on the HI column density distribution
• Atomic hydrogen in IllustrisTNG galaxies: the impact of environment parallelled with local 21-cm surveys
• The Bluedisks project, a study of unusually HI-rich galaxies: I. HI Sizes and Morphology
• The AMIGA sample of isolated galaxies IX. Molecular gas properties
• The uniformity and time-invariance of the intra-cluster metal distribution in galaxy clusters from the IllustrisTNG simulations
• The fundamental plane of star formation in galaxies revealed by the EAGLE hydrodynamical simulations
• The CO Luminosity Density at High-z (COLDz) Survey: A Sensitive, Large Area Blind Search for Low-J CO Emission from Cold Gas in the Early Universe with the Karl G. Jansky Very Large Array
• A census of cool core galaxy clusters in IllustrisTNG
• The zCOSMOS-SINFONI Project I: Sample Selection and Natural-Seeing Observations
• The environmental dependence of HI in galaxies in the EAGLE simulations
• Formation and Incidence of Shell Galaxies in the Illustris Simulation
• Neutral atomic hydrogen (HI) gas evolution in field galaxies at z ~ 0.1 and 0.2
• The Hubble Sequence at $z\sim 0$ in the IllustrisTNG simulation with deep learning
• The relationship between the morphology and kinematics of galaxies and its dependence on dark matter halo structure in EAGLE
• Line Overlap and Self-Shielding of Molecular Hydrogen in Galaxies
• On the OVI Abundance in the Circumgalactic Medium of Low-Redshift Galaxies
• Which galaxies dominate the neutral gas content of the Universe?
• The HI Content of the Universe over the Past 10 Gyrs
• Massive quenched galaxies at z~0.7 retain large molecular gas reservoirs
• Log-normal star formation histories in simulated and observed galaxies
• Neutral hydrogen (HI) gas content of galaxies at $z\approx 0.32$
• Linking galaxy structural properties and star formation activity to black hole activity with IllustrisTNG
• xGASS: Gas-rich central galaxies in small groups and their connections to cosmic web gas feeding
• Full-disc ${}^{13}$CO(1-0) mapping across nearby galaxies of the EMPIRE survey and the CO-to-H${}_2$ conversion factor
• The implications of the surprising existence of a large, massive CO disk in a distant protocluster
• The inner structure of early-type galaxies in the Illustris simulation
• Properties of HI discs in the Auriga cosmological simulations
• Hot Gaseous Coronae around Spiral Galaxies: Probing the Illustris Simulation
• The colors of satellite galaxies in the Illustris Simulation
• The Statistical Properties of Neutral Gas at z<1.65 from UV Measurements of Damped Lyman Alpha Systems
• Molecular gas on large circumgalactic scales at z=3.47
• The EGNoG Survey: Molecular Gas in Intermediate-Redshift Star-Forming Galaxies
• Connecting Transitions in Galaxy Properties to Refueling
• The UNAM-KIAS Catalog of Isolated Galaxies
• Modelling neutral hydrogen in galaxies using cosmological hydrodynamical simulations
• Detailed HI kinematics of Tully-Fisher calibrator galaxies
• Statistical properties of damped Lyman-alpha systems from Sloan Digital Sky Survey DR12
• GMRT observation of neutral atomic hydrogen gas in the COSMOS field at $z\sim 0.37$
• Formation of a Malin 1 analogue in IllustrisTNG by stimulated accretion
• Deep 21-cm HI Observations at z~0.1: The Precursor to the Arecibo Ultra Deep Survey
• The DiskMass Survey. X. Radio synthesis imaging of spiral galaxies
• The Fueling Diagram: Linking Galaxy Molecular-to-Atomic Gas Ratios to Interactions and Accretion
• Dark matter stripping in galaxy clusters: a look at the Stellar to Halo Mass relation in the Illustris simulation
• The Effect Of AGN Heating On The Low-Redshift Lyα Forest
• Spectroscopic Confusion: Its Impact on Current and Future Extragalactic HI Surveys
• Where do galaxies end? Comparing measurement techniques of hydrodynamic-simulation galaxies' integrated properties
• Confronting Cold Dark Matter Predictions with Observed Galaxy Rotations
• PKSB1740-517: An ALMA view of the cold gas feeding a distant interacting young radio galaxy
• The Bluedisk Survey: molecular gas distribution and scaling relations in the context of galaxy evolution

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