Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal Enrichment of The Primordial Interstellar Medium through 3-D
  Hydrodynamical Evolution of The First Supernova Remnant   The long-term evolution of supernova remnants (SNRs) in the primordial
interstellar medium (ISM) with an inhomogeneous structure is calculated to
investigate metal enrichment of the primordial gas. For this purpose, we have
constructed a parallel 3-D hydrodynamics code incorporating the radiative
cooling and self-gravity. The self-gravity and radiative cooling develop the
inhomogeneous structure of the ISM from a small perturbation with a power-law
spectrum. The resultant density ranges from 0.5 cm$^{-3}$ to 10$^6$ cm $^{-3}$.
Calculations for a supernova (SN) with the progenitor mass of 20 solar mass are
performed as the first step of a series of our study. It is found from the
results that a single SN distributes some of newly synthesized heavy elements
into a dense filament of the ISM with densities ranging from 100 to 10$^4$
cm$^{-3}$ depending on where the SN explodes. Thus, the metallicity [Mg/H] of
the dense filaments polluted by the SN ejecta becomes $-2.7\pm0.5$. From these
filaments, the first Population II stars will form. This value is in accordance
with the previous analytical work (Shigeyama & Tsujimoto 1998) with accuracy of
$\sim 0.3$ dex.

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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
31
The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an