Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chemistry and Dynamics in Pre-Protostellar Cores   We have compared the intensity distribution of molecular line emission with
that of dust continuum emission, and modeled molecular line profiles in three
different preprotostellar cores in order to test how dynamical evolution is
related to chemical evolution, and whether we can use different chemical
tracers to identify specific dynamical evolutionary stages. We used dust
continuum emission to obtain the input density and temperature structures by
calculating radiative transfer of dust emission. Our results show that chemical
evolution is dependent on dynamical processes, which can give different
evolutionary timescales, as well as the density structure of the core.

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The categories of this paper are: econ
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th