Collapse and expansion in the bright-rimmed cloud SFO11NE

Thompson, M.A. and White, G.J. (2004) Collapse and expansion in the bright-rimmed cloud SFO11NE. Astronomy & Astrophysics, 419 (2). pp. 599-605. ISSN 0004-6361. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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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 (HCO+)-C-13 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: Article
Additional information: 32 E D P SCIENCES 827GD
Uncontrolled keywords: stars : formation; ISM : individual object : SFO11NE; ISM : clouds; ISM : dust, extinction; ISM : molecules; submillimeter
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 02 Oct 2008 16:20
Last Modified: 14 Jan 2010 14:42
Resource URI: (The current URI for this page, for reference purposes)
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