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Collapse and expansion in the bright-rimmed cloud SFO 11NE

Thompson, M. A. and White, G. J. (2004). Collapse and expansion in the bright-rimmed cloud SFO 11NE. Astronomy and Astrophysics, 419(2) pp. 599–605.

URL: http://dx.doi.org/10.1051/0004-6361:20035821
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Abstract

We report the results of a search for the double-peaked blue-skewed infall signature in the bright-rimmed cloud core SFO 11NE SMM1. Observations of the optically thick HCO + and optically thin H 13CO + J=3-2 lines reveal that there is indeed a characteristic double-peaked line profile, but skewed to the red rather than the blue. Modelling of the dust continuum emission and line profiles show that the motions within SFO 11NE SMM1 are consistent with a collapsing central core surrounded by an expanding outer envelope. We show that the collapse is occurring at a similar rate to that expected onto a single solar-mass protostar and is unlikely to represent the large-scale collapse of gas onto the infrared cluster seen at the heart of SFO 11NE SMM1. The outer envelope is expanding at a much greater rate than that expected for a photoevaporated flow from the cloud surface. The modelled expansion is consistent with the bulk cloud re-expansion phase predicted by radiative-driven implosion models of cometary clouds.

Item Type: Journal Article
Copyright Holders: 2004 ESO
ISSN: 1432-0746
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 31810
Depositing User: Glenn White
Date Deposited: 15 Feb 2012 16:50
Last Modified: 15 Feb 2012 16:50
URI: http://oro.open.ac.uk/id/eprint/31810
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