The co-evolution of molecular hydrogen and the grain size distribution in an isolated galaxy

Abstract

Understanding the evolution of dust and molecular hydrogen (H${}_2$) is a critical aspect of galaxy evolution, as they affect star formation and the spectral energy distribution of galaxies. We use the $N$-body/smoothed-particle-hydrodynamics code {\sc Gadget-4} to compute the evolution of dust and H${}_2$ in a suite of numerical simulations of an isolated Milky-Way-like galaxy. The evolution of the full grain size distribution (GSD) is solved by sampling the grain size on a logarithmically spaced grid with 30 bins. The evolution of a primordial chemistry network with twelve species is solved consistently with the hydrodynamic evolution of the system, including star formation, metal and energy ejections from stars into the interstellar medium through supernova feedback and stellar winds. The formation model for H${}_2$ considers the GSD and photo-dissociation through the UV radiation of young stars. We identify the processes needed for producing a sizeable amount of H${}_2$, verify that the resulting star formation law in the later stages of galaxy evolution is consistent with observations of local spirals, and show that our model manages to produce a galactic molecular gas fraction in line with observations of Milky-Way-like galaxies. We stress the importance of the co-evolution of the GSD and H${}_2$, as models assuming a fixed MRN shape for the GSD overestimate the production of H${}_2$ in regimes where the dust abundance is dominated by large grains and underestimate it in the regime where the dust is dominated by small grains, both of which are realized in simulations of dust evolution.

Accepted for publication in MNRAS. 16 pages, 13 figures

References in corpus (27)

• SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
• Simulating cosmic structure formation with the GADGET-4 code
• Dust Formation and Survival in Supernova Ejecta
• Grackle: a Chemistry and Cooling Library for Astrophysics
• Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies
• HI-to-H2 Transitions and H I Column Densities in Galaxy Star-Forming Regions
• [CII] 158$\mu$m Emission and Metallicity in PDRs
• Tracing the total molecular gas in galaxies: [CII] and the CO-dark gas
• MUFASA: Galaxy star formation, gas, and metal properties across cosmic time
• Shattering and coagulation of dust grains in interstellar turbulence
• Modelling Dust Evolution in Galaxies with a Multiphase, Inhomogeneous ISM
• Galaxy Simulation with Dust Formation and Destruction
• The impact of chemistry on the structure of high-z galaxies
• Chemical Rates on Small Grains and PAHs: C^+ Recombination and H_2 Formation
• The environmental dependence of the X_CO conversion factor
• Dust-regulated galaxy formation and evolution:A new chemodynamical model with live dust particles
• The natural emergence of the correlation between H2 and star formation rate surface densities in galaxy simulations
• Two-size approximation: a simple way of treating the evolution of grain size distribution in galaxies
• Osaka Feedback Model: Isolated Disk Galaxy Simulations
• A Far Ultraviolet Spectroscopic Explorer Survey of Interstellar Molecular Hydrogen in the Galactic Disk
• Dust evolution in zoom-in cosmological simulations of galaxy formation
• Populating H${}_2$ and CO in galaxy simulation with dust evolution
• The Origin of the Dust Extinction Curve in Milky Way-like Galaxies
• Atomic and molecular gas from the epoch of reionization down to redshift 2
• How Metals Are Transported In And Out Of A Galactic Disk: Dependence On The Hydrodynamic Schemes In Numerical Simulations
• Effects of dust evolution on the abundances of CO and H${}_2$
• Evolution of the grain size distribution in Milky Way-like galaxies in post-processed IllustrisTNG simulations

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• Co-evolution of Dust and Chemistry in Galaxy Simulations with a Resolved Interstellar Medium
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• Dust grain size evolution in local galaxies: a comparison between observations and simulations
• Star Formation and Chemical Enrichment in Protoclusters
• Evolution of grain size distribution with enhanced abundance of small carbonaceous grains in galactic environments
• Analytic models of dust temperature in high-redshift galaxies
• Far-ultraviolet Dust Extinction and Molecular Hydrogen in the Diffuse Milky Way Interstellar Medium
• Effects of dust grain size distribution on the abundances of CO and H${}_2$ in galaxy evolution
• Cosmic evolution of grain size distribution in galaxies using the ${\nu }^2$GC semi-analytic model
• Observational signatures of the dust size evolution in isolated galaxy simulations
• Intertwined Formation of ${\mathrm{H}}_2$, Dust, and Stars in Cosmological Simulations
• The AGORA High-resolution Galaxy Simulations Comparison Project. VIII: Disk Formation and Evolution of Simulated Milky Way Mass Galaxy Progenitors at $1<z<5$
• Validating the CROCODILE model within the AGORA galaxy simulation framework
• Non-Parametric Attenuation Curves in Local Star-Forming Galaxies: Geometry Effect, Dust Evolution, and ISS
• CROCODILE-DWARF: Assembly and Kinematics of Field Dwarf Galaxies with GADGET4-OSAKA