Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Serendipitous 2MASS Discoveries Near the Galactic Plane: A Spiral Galaxy
  and Two Globular Clusters   We present the basic properties of three objects near the Galactic Plane - a
large galaxy and two candidate globular clusters - discovered in the Two Micron
All Sky Survey (2MASS) dataset. All were noted during spot-checks of the data
during 2MASS quality assurance reviews. The galaxy is a late-type spiral galaxy
(Sc-Sd), ~11 Mpc distant. We estimate an extinction-corrected optical diameter
of ~9.5', making it larger than most Messier galaxies. The candidate globular
clusters are ~2-3' in extent and are hidden optically behind foreground
extinctions of Av ~18-21 mag at l ~ 10 deg, b ~ 0 deg. These chance discoveries
were not the result of any kind of systematic search but they do hint at the
wealth of obscured sources of all kinds, many previously unknown, that are in
the 2MASS dataset.

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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
16
The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
2
The categories of this paper are: math
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The categories of this paper are: mtrl-th