Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Spitzer c2d Survey of Large, Nearby, Interstellar Clouds: VII.
  Ophiuchus Observed with MIPS   We present maps of 14.4 deg^2 of the Ophiuchus dark clouds observed by the
Spitzer Space Telescope Multiband Imaging Photometer for Spitzer (MIPS). These
high quality maps depict both numerous point sources as well as extended dust
emission within the star-forming and non-star-forming portions of these clouds.
Using PSF-fitting photometry, we detect 5779 sources at 24 um and 81 sources at
70 um at the 10 sigma level of significance. Three hundred twenty-three
candidate young stellar objects (YSOs) were identified according to their
positions on the MIPS/2MASS K versus K$-$[24] color-magnitude diagrams as
compared to 24 um detections in the SWIRE extragalactic survey. We find that
more than half of the YSO candidates, and almost all the ones with protostellar
Class I spectral energy distributions, are confined to the known cluster and
aggregates.

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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: eess