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The influence of shocks on star formation in the OMC1 Ridge

Greaves, J.S. and White, Glenn J. (1991). The influence of shocks on star formation in the OMC1 Ridge. Astronomy & Astrophysics, 248 L27-L30.

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Abstract

Observations are presented of the OMC1 Ridge (a narrow band of molecular gas containing high-mass embedded sources), in the transitions CN N = 2 - 1, 13CO J = 2 - 1 and 13S J = 5 - 4. Variations in velocities and line widths indicate that three distinct regions are present in the area mapped, and that at least one of these is rotating. The resulting shocks when these fragments collided will have compressed the gas to a density nH2~107-8cm-3, sufficient to trigger collapse and to explain the presence of high-mass stars at the edges of the cloud fragments, rather than in their cores. These observational results support theoretical predictions of the importance of collisions in star formation.

Item Type: Journal Article
Copyright Holders: 1991 European Southern Observatory
ISSN: 1432-0746
Keywords: massive stars; molecular clouds; shock wave propagation; star formation; astronomical models; gravitational collapse; molecular gases; spectral line width
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 33339
Depositing User: Glenn White
Date Deposited: 25 May 2012 09:11
Last Modified: 31 Oct 2014 16:32
URI: http://oro.open.ac.uk/id/eprint/33339
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