Simulating galactic dust grain evolution on a moving mesh
Simulating galactic dust grain evolution on a moving mesh
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在移动网格上模拟银河尘埃颗粒的演化
DOI:
10.1093/mnras/sty1248
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发表时间:
2018
影响因子:
4.8
通讯作者:
Kannan, Rahul
中科院分区:
文献类型:
--
作者:
McKinnon, Ryan;Vogelsberger, Mark;Torrey, Paul;Marinacci, Federico;Kannan, Rahul
Interstellar dust is an important component of the galactic ecosystem, playing a key role in multiple galaxy formation processes. We present a novel numerical framework for the dynamics and size evolution of dust grains implemented in the moving-mesh hydrodynamics codeareposuited for cosmological galaxy formation simulations. We employ a particle-based method for dust subject to dynamical forces including drag and gravity. The drag force is implemented using a second-order semi-implicit integrator and validated using several dust-hydrodynamical test problems. Each dust particle has a grain-size distribution, describing the local abundance of grains of different sizes. The grain-size distribution is discretized with a second-order piecewise linear method and evolves in time according to various dust physical processes, including accretion, sputtering, shattering, and coagulation. We present a novel scheme for stochastically forming dust during stellar evolution and new methods for sub-cycling of dust physics time-steps. Using this model, we simulate an isolated disc galaxy to study the impact of dust physical processes that shape the interstellar grain-size distribution. We demonstrate, for example, how dust shattering shifts the grain-size distribution to smaller sizes, resulting in a significant rise of radiation extinction from optical to near-ultraviolet wavelengths. Our framework for simulating dust and gas mixtures can readily be extended to account for other dynamical processes relevant in galaxy formation, like magnetohydrodynamics, radiation pressure, and thermochemical processes.
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