Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Submillimeter and molecular views of three Galactic ring-like HII
  regions   We use SCUBA 850 micron and CO observations to analyze the surroundings of
three Galactic ring-like HII regions, KR 7, KR 81, and KR 120 (Sh 2-124, Sh
2-165 and Sh 2-187), with the aim of finding sites of triggered star formation.
We find one prominent submillimeter (sub-mm) source for each region, located at
the interface between the HII region and its neutral surroundings. Using Two
Micron All Sky Survey photometry, we find that the prominent sub-mm source for
KR 120 probably contains an embedded cluster of young stellar objects (YSOs),
making it a likely site for triggered star formation. The KR 7 sub-mm source
could possibly contain embedded YSOs, while the KR 81 sub-mm source likely does
not. The mass column densities for these dominant sub-mm sources fall in the
~0.1-0.6 g cm^{-2} range. The mass of the cold, dense material (clumps) seen as
the three dominant sub-mm sources fall around ~100 Solar masses. We use the
SCUBA Legacy catalog to characterize the populations of sub-mm sources around
the HII regions, and compare them to the sources found around a previously
studied similar ring-like HII region (KR 140) and near a massive star-forming
region (W3). Finally, we estimate the IR luminosities of the prominent newly
detected sub-mm sources and find that they are correlated with the clump mass,
consistent with a previously known luminosity-mass relationship which this
study shows to be valid over four orders of magnitude in mass.

18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys