Testing Triggered Star Formation in Six H II Regions

We investigated six H II regions with infrared, bright rimmed bubble or cometary morphology, in search of quantitative evidence for triggered star formation, both collect and collapse and radiatively driven implosion. We identified and classified 458 Young Stellar Objects (YSOs) in and around the H...

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Bibliographic Details
Published in:arXiv.org 2012-12
Main Authors: Dirienzo, William J, Indebetouw, Rémy, Brogan, Crystal, Cyganowski, Claudia J, Churchwell, Edward B, Friesen, Rachel K
Format: Article
Language:English
Subjects:
Blistering
Clumps
Comets
Computer simulation
Continuum radiation
Gravitational collapse
H II regions
Infrared photometry
Mathematical models
Molecular gases
Morphology
Photometry
Physical properties
Point sources
Protostars
Radiative transfer
Stability analysis
Star & galaxy formation
Star formation
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Summary:We investigated six H II regions with infrared, bright rimmed bubble or cometary morphology, in search of quantitative evidence for triggered star formation, both collect and collapse and radiatively driven implosion. We identified and classified 458 Young Stellar Objects (YSOs) in and around the H II regions. YSOs were determined by fitting a collection of radiative transfer model spectral energy distributions (SEDs) to infrared photometry for a large sample of point sources. We determined areas where there exist enhanced populations of relatively unevolved YSOs on the bright rims of these regions, suggesting that star formation has been triggered there. We further investigated the physical properties of the regions by using radio continuum emission as a proxy for ionizing flux powering the H II regions, and 13CO (1-0) observations to measure masses and gravitational stability of molecular clumps. We used an analytical model of collect and collapse triggered star formation, as well as a simulation of radiatively driven implosion, and thus we compare the observed properties of the molecular gas with those predicted in the triggering scenarios. Notably, those regions in our sample that show evidence of cometary, or "blister," morphology are more likely to show evidence of triggering. Keywords: HII regions -- ISM: bubbles -- Stars: formation -- Stars: protostars
ISSN:2331-8422
DOI:10.48550/arxiv.1210.2647