2019ApJ...884...77B -
Astrophys. J., 884, 77-77 (2019/October-2)
The distribution of dense cores near H II regions.
BOBOTSIS G. and FICH M.
Abstract (from CDS):
An investigation of dust emission associated with a large sample of H II regions has been carried out. Stacked results from this sample suggest that each H II region is at or near the center of a cluster of dense cores that extends far beyond the H II region, and has a volume density that decreases as r–3. The data also show evidence for enhanced numbers of cores near the boundary of the H II regions. At the same time, a significant decrease in the number of cores, consistent with no cores, is observed in the interior of these H II regions. Neither these H II regions nor their associated massive OB stars were found to have a significant heating effect on their associated dusty clumps. "Clouds," or the outermost layers of the clumps in which the cores are embedded, are found to exert a strong shielding effect against external heating sources. Despite this, a large portion of the identified cores were found to be warmer than their surrounding clouds and consequently may be in the initial stages of star formation. The star-formation efficiency of the 7 H II region systems with the most reliable mass budgets ranged between 1% and 9%.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Massive stars - Young stellar objects - Dense interstellar clouds
Simbad objects:
38
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