Dust diffusion in SPH simulations of an isolated galaxy

Abstract

We compute the evolution of the grain size distribution (GSD) in a suite of numerical simulations of an isolated Milky-Way-like galaxy using the $N$-body/smoothed-particle-hydrodynamics code {\sc Gadget-4}. The full GSD is sampled on a logarithmically spaced grid with 30 bins, and its evolution is calculated self-consistently with the hydrodynamical and chemical evolution of the galaxy using a state-of-the-art star formation and feedback model. In previous versions of this model, the GSD tended to be slightly biased towards larger grains and the extinction curve had a tendency to be flatter than the observations. This work addresses these issues by considering the diffusion of dust and metals through turbulence on subgrid scales and introducing a multi-phase subgrid model that enables a smoother transition from diffuse to dense gas. We show that diffusion can significantly enhance the production of small grains and improve the agreement with the observed dust extinction curve in the Milky Way.

Accepted for publication in MNRAS. 20 pages, 23 figures

References in corpus (19)

• SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
• An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR-Through-UV Curve Morphology
• Dust Formation and Survival in Supernova Ejecta
• Grackle: a Chemistry and Cooling Library for Astrophysics
• Evolution of interstellar dust and stardust in the solar neighbourhood
• Fragmentation of star-forming clouds enriched with the first dust
• Environmental Dependence of the Kennicutt-Schmidt Relation in Galaxies
• Shattering and coagulation of dust grains in interstellar turbulence
• Galaxy Simulation with Dust Formation and Destruction
• Thermal conduction in cosmological SPH simulations
• The origin of dust in galaxies revisited: the mechanism determining dust content
• Dust-regulated galaxy formation and evolution:A new chemodynamical model with live dust particles
• Dust scaling relations in a cosmological simulation
• Two-size approximation: a simple way of treating the evolution of grain size distribution in galaxies
• Osaka Feedback Model: Isolated Disk Galaxy Simulations
• Populating H${}_2$ and CO in galaxy simulation with dust evolution
• Evolution of dust content in galaxies probed by gamma-ray burst afterglows
• How Metals Are Transported In And Out Of A Galactic Disk: Dependence On The Hydrodynamic Schemes In Numerical Simulations
• Evolution of the grain size distribution in Milky Way-like galaxies in post-processed IllustrisTNG simulations

Cited by in corpus (5)

• The AGORA High-resolution Galaxy Simulations Comparison Project. VI. Similarities and Differences in the Circumgalactic Medium
• Dust grain size evolution in local galaxies: a comparison between observations and simulations
• Evolution of grain size distribution with enhanced abundance of small carbonaceous grains in galactic environments
• Cosmic evolution of grain size distribution in galaxies using the ${\nu }^2$GC semi-analytic model
• Effects of dust grain size distribution on the abundances of CO and H${}_2$ in galaxy evolution