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Before the first supernova : combined effects of H II regions and winds on molecular clouds

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Date
21/07/2014
Author
Dale, J.E.
Ngoumou, J.
Ercolano, B.
Bonnell, I.A.
Funder
European Research Council
Science & Technology Facilities Council
Grant ID
ST/J001651/1
Keywords
Stars: formation
ISM: bubbles
H II regions
QB Astronomy
QC Physics
BDC
R2C
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Abstract
We model the combined effects of photoionization and momentum-driven winds from O-stars on molecular clouds spanning a parameter space of initial conditions. The dynamical effects of the winds are very modest. However, in the lower mass clouds, they influence the morphologies of the H II regions by creating 10-pc-scale central cavities. The inhomogeneous structures of the model giant molecular clouds (GMCs) make them highly permeable to photons, ionized gas and supernova ejecta, and the leaking of ionized gas in particular strongly affects their evolution, reducing the effectiveness of feedback. Nevertheless, feedback is able to expel large fractions of the mass of the lower escape velocity clouds. Its impact on star formation is more modest, decreasing final star formation efficiencies by 10-20 per cent, and the rate of change of the star formation efficiency per freefall time by about one third. However, the clouds still form stars substantially faster than observed GMCs.
Citation
Dale , J E , Ngoumou , J , Ercolano , B & Bonnell , I A 2014 , ' Before the first supernova : combined effects of H II regions and winds on molecular clouds ' , Monthly Notices of the Royal Astronomical Society , vol. 442 , no. 1 , pp. 694-712 . https://doi.org/10.1093/mnras/stu816
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu816
ISSN
0035-8711
Type
Journal article
Rights
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Description
IAB acknowledges funding from the European Research Council for the FP7 ERC advanced grant project ECOGAL. JN would like to acknowledge the German Deutsche Forschungsgemeinschaft, DFGPR 569/9-1.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5366

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