Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searching for initial stage of massive star formation around the H II
  region G18.2-0.3   Sometimes the early star formation can be found in cold and dense molecular
clouds, such as infrared dark cloud (IRDC). Considering star formation often
occurs in clustered condition, HII regions may be triggering a new generation
of star formation, so we can search for initial stage of massive star formation
around HII regions. Based on that above, this work is to introduce one method
of how to search for initial stage of massive star formation around HII
regions. Towards one sample of the HII region G18.2-0.3, multiwavelength
observations are carried out to investigate its physical condition. In contrast
and analysis, we find three potential initial stages of massive star formation,
suggesting that it is feasible to search for initial stage of massive star
formation around HII regions.

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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
30
The categories of this paper are: q-alg
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The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph