Issue |
A&A
Volume 419, Number 2, May IV 2004
|
|
---|---|---|
Page(s) | 599 - 605 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20035821 | |
Published online | 03 May 2004 |
Collapse and expansion in the bright-rimmed cloud SFO 11NE
Centre for Astrophysics & Planetary Science, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NR, UK
Corresponding author: M. A. Thompson, m.a.thompson@kent.ac.uk
Received:
8
December
2003
Accepted:
19
February
2004
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 H13CO+ 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.
Key words: stars: formation / ISM: individual object: SFO 11NE / ISM: clouds / ISM: dust, extinction / ISM: molecules / submillimeter
© ESO, 2004
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