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Flaws in the perfect bubble | | S. Walch
; A. Whitworth
; T. Bisbas
; D. A. Hubber
; R. Wuensch
; | | Date: |
15 Sep 2011 | | Abstract: | Perfect bubbles like that surrounding the galactic HII region RCW 120
(Deharveng et al. 2009) have been interpreted as proof of concept for the
collect and collapse (C & C) mechanism of triggered star formation. The cold,
dusty clumps surrounding RCW 120 are aligned along an almost spherical shell.
It has been inferred that these massive clumps, which sometimes harbour young
stellar objects, have been formed via the fragmentation of the dense, swept-up
shell. In order to better understand the triggering mechanisms at work in
shells like RCW 120, we perform high-resolution, three dimensional SPH
simulations of HII regions expanding into fractal molecular clouds. In a second
step, we use RADMC-3D to compute the synthetic dust continuum emission from our
simulations, in order to compare them with observations of RCW 120 made with
APEX-LABOCA at 870 micron. We show that a distribution of clumps similar to the
one seen in RCW 120 can readily be explained by a non-uniform underlying
molecular cloud structure. Hence, a shell-like clump configuration around an
HII region does not necessarily support the C & C scenario, but rather reflects
the pre-existing, non-uniform density distribution of the molecular cloud into
which the HII region expands. | | Source: | arXiv, 1109.3478 | | Services: | Forum | Review | PDF | Favorites | |
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