  We have mapped the central 10'x10' of the dense core TMC-1C at 450 and 850
microns using SCUBA on the James Clerk Maxwell Telescope. The unusually high
quality of the 450 micron map allows us to make a detailed analysis of the
temperature and column density profiles of the core. We find that the dust
temperature at the center of TMC-1C is 7 K, rising to 11 K at the edges. We
discuss the possibility and effects of a variable emissivity spectral index on
the derived mass profile. The low dust temperature of TMC-1C results in a high
derived mass for the core, significantly larger than the virial mass estimated
from the linewidth of the N2H+ (1-0) transition. This result is valid within a
wide range of dust properties and ellipticities of the core. The N2H+ (1-0)
spectra, taken with the IRAM 30m telescope, show signs of self-absorption,
which provide evidence of sub-sonic infall motions. The derived density profile
and infall velocity is compared to the predictions of several popular star
formation models, and the Bonnor-Ebert model isthe best fit analytic model.
