Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of the grain size distribution in Milky Way-like galaxies in
  post-processed IllustrisTNG simulations   We model dust evolution in Milky Way-like galaxies by post-processing the
IllustrisTNG cosmological hydrodynamical simulations in order to predict
dust-to-gas ratios and grain size distributions. We treat grain-size-dependent
dust growth and destruction processes using a 64-bin discrete grain size
evolution model without spatially resolving each galaxy. Our model broadly
reproduces the observed dust--metallicity scaling relation in nearby galaxies.
The grain size distribution is dominated by large grains at $z\gtrsim 3$ and
the small-grain abundance rapidly increases by shattering and accretion (dust
growth) at $z\lesssim 2$. The grain size distribution approaches the so-called
MRN distribution at $z\sim 1$, but a suppression of large-grain abundances
occurs at $z<1$. Based on the computed grain size distributions and grain
compositions, we also calculate the evolution of the extinction curve for each
Milky Way analogue. Extinction curves are initially flat at $z>2$, and become
consistent with the Milky Way extinction curve at $z\lesssim 1$ at $1/\lambda <
6~\rm \mu m^{-1}$. However, typical extinction curves predicted by our model
have a steeper slope at short wavelengths than is observed in the Milky Way.
This is due to the low-redshift decline of gas-phase metallicity and the dense
gas fraction in our TNG Milky Way analogues that suppresses the formation of
large grains through coagulation.

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The categories of this paper are: q-alg
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: physics