Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741104f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #411.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
The star cluster AFGL4029 and associated nebulosity IC1848 (herein referred to as bright-rimmed cloud SFO14) has been forwarded by numerous studies as an example of small-scale sequential star formation (S4F), in which star formation proceeds across a region as the result of triggering mechanisms such as Collect-and-Collapse and Radiative Driven Implosion (RDI). We would like to develop a detailed picture of the molecular dynamical interactions within SFO14 (and other regions where RDI may be responsible for star formation) in order to see if the dynamics within the cloud can be linked to the conditions in the HII region beyond the rim.
We present multi-wavelength observations of the bright-rimmed cloud SFO14 in NH3(1,1) and (2,2) inversion transitions and 12CO, 13CO, and C18O (J=3->2) transitions. These observations allow determination of kinematics within the cloud (thermal and turbulent motions and outflows), cloud opacities, and kinetic temperatures.
We identify two cores within SFO14: a larger primary core nearer the rim (associated with the known UCHII reigion AFGL4029-IRS1) and a weaker core approximately 2' east of the primary. These cores are apparent in both NH3 and CO maps, although positions of peak molecular emission vary by about 20". The primary core shows morphological evidence of interaction with the rim in both NH3 and CO species.
These CO and NH3 observations combine with earlier observations (including 8 µm and radio emission maps) to make SFO14 one of the more convincing examples of RDI-triggered star formation. Extending these studies to a larger sample of bright-rimmed clouds is expected to verify the role of RDI as a significant contributor to the galactic IMF.
Figura Charles C.
Moore Thomas
Morgan Larry
Urquhart James
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