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Triggered Star Formation

Published online by Cambridge University Press:  16 November 2011

C. Charbonnel ,
T. Montmerle  and
B.G. Elmegreen
B.G. Elmegreen*
Affiliation:
IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, USA
*
e-mail: [email protected]
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Abstract

Triggered star formation in bright rims and shells is reviewed. Shells are commonly observed in the Milky Way and other galaxies, but most diffuse shells seen in HI or the infrared do not have obvious triggered star formation. Dense molecular shells and pillars around HII regions often do have such triggering, although sometimes it is difficult to see what is triggered and what stars formed in the gas before the pressure disturbances. Pillar regions without clear age gradients could have their stars scattered by the gravity of the heads. Criteria and timescales for triggering are reviewed. The insensitivity of the average star formation rate in a galaxy to anything but the molecular mass suggests that triggering is one of many processes that lead to gravitational collapse and star formation.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 51: Star Formation in the Local Universe – EES2010 , 2011 , pp. 45 - 58
Copyright
© EAS, EDP Sciences, 2011

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