Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: From Clumps to Cores to Protostars: The JCMT Gould Belt Survey's
  "First-Look" analysis of Southern Orion A using SCUBA-2   We present a subset of the James Clerk Maxwell Telescope Gould Belt Survey's
"first-look" results of the southern extent of the Orion A molecular cloud.
Employing a two-step structure identification process, we constructed
individual catalogues for large-scale regions of significant emission labeled
as "islands" and smaller-scale subregions called "fragments" using the 850
$\mu$m continuum maps obtained using the Submillimetre Common-User Bolometer
Array 2 (SCUBA-2). We highlight the relationship between the concentration and
Jeans stability for regions of significant emission and present the results of
an investigation into the spatial distribution of Young Stellar Objects
detected using the Spitzer Space Telescope and the Herschel Space Observatory.
We find an apparent evolution in the velocity dispersion from Class 0 to Class
II objects which we derive from comparing our observations to a simple model.

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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol