Astron. J., 141, 153 (2011/May-0)
Submillimeter and molecular views of three galactic ring-like H II regions.
ARVIDSSON K. and KERTON C.R.
Abstract (from CDS):
We use SCUBA 850 µm and CO observations to analyze the surroundings of three Galactic ring-like H II 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 H II 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/cm2 range. The mass of the cold, dense material (clumps) seen as the three dominant sub-mm sources falls around ∼100 M☉. We use the SCUBA Legacy catalog to characterize the populations of sub-mm sources around the H II regions, and compare them to the sources found around a previously studied similar ring-like H II 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.
H II regions - ISM: bubbles - ISM: clouds - stars: formation - stars: massive - surveys
In paragraph 4, IRAS 021757+6053 is a misprint for IRAS 02157+6053.
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