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Thermal and nonthermal dust sputtering in hydrodynamical simulations of the multiphase interstellar medium | | Chia-Yu Hu
; Svitlana Zhukovska
; Rachel S. Somerville
; Thorsten Naab
; | | Date: |
4 Feb 2019 | | Abstract: | We study the destruction of interstellar dust via sputtering in supernova
(SN) shocks using three-dimensional hydrodynamical simulations. With a novel
numerical framework, we follow both sputtering and dust dynamics governed by
direct collisions, plasma drag and betatron acceleration. The amount of dust
destroyed per SN is quantified for a broad range of ambient densities and
fitting formulae are provided. Integrated over the grain-size distribution,
nonthermal (inertial) sputtering dominates over thermal sputtering for typical
ambient densities. We present the first simulations that explicitly follow dust
sputtering within a turbulent multiphase interstellar medium. We find that the
dust destruction timescales $ au$ are 0.35 Gyr for silicate dust and 0.44 Gyr
for carbon dust in solar neighborhood conditions. The SN environment has an
important impact on $ au$. SNe that occur in preexisting bubbles destroy less
dust as the destruction is limited by the amount of dust in the shocked gas.
This makes $ au$ about 2.5 times longer than the estimate based on results
from a single SN explosion. We investigate the evolution of the dust-to-gas
mass ratio (DGR), and find that a spatial inhomogeneity of $sim$ 14\% develops
for scales below 10 pc. It locally correlates positively with gas density but
negatively with gas temperature even in the exterior of the bubbles due to
incomplete gas mixing. This leads to a $sim$ 30\% lower DGR in the volume
filling warm gas compared to that in the dense clouds. | | Source: | arXiv, 1902.1368 | | Services: | Forum | Review | PDF | Favorites | |
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