The JCMT Gould Belt Survey: A First Look at IC 5146
  We present 450 and 850 micron submillimetre continuum observations of the
IC5146 star-forming region taken as part of the JCMT Gould Belt Survey. We
investigate the location of bright submillimetre (clumped) emission with the
larger-scale molecular cloud through comparison with extinction maps, and find
that these denser structures correlate with higher cloud column density.
Ninety-six individual submillimetre clumps are identified using FellWalker and
their physical properties are examined. These clumps are found to be relatively
massive, ranging from 0.5to 116 MSun with a mean mass of 8 MSun and a median
mass of 3.7 MSun. A stability analysis for the clumps suggest that the majority
are (thermally) Jeans stable, with M/M_J < 1. We further compare the locations
of known protostars with the observed submillimetre emission, finding that
younger protostars, i.e., Class 0 and I sources, are strongly correlated with
submillimetre peaks and that the clumps with protostars are among the most
Jeans unstable. Finally, we contrast the evolutionary conditions in the two
major star-forming regions within IC5146: the young cluster associated with the
Cocoon Nebula and the more distributed star formation associated with the
Northern Streamer filaments. The Cocoon Nebula appears to have converted a
higher fraction of its mass into dense clumps and protostars, the clumps are
more likely to be Jeans unstable, and a larger fraction of these remaining
clumps contain embedded protostars. The Northern Streamer, however, has a
larger number of clumps in total and a larger fraction of the known protostars
are still embedded within these clumps.
