Star formation conditions in a Planck Galactic Cold Clump, G108.84-00.81
  We present the results from a series of ground-based radio observations
toward a Planck Galactic Cold Clump (PGCC), PGCC G108.84-00.81, which is
located in one curved filamentary cloud in the vicinity of an extended HII
region Sh2-152 and SNR G109.1-1.0. PGCC G108.84-00.81 is mainly composed of two
clumps, "G108-N" and "G108-S". In the 850 micron dust continuum emission map,
G108-N is shown as one component while G108-S is fragmented into four
components. There is no infrared source associated with G108-N while there are
two infrared sources (IRS 1 and IRS 2) associated with G108-S. The total mass
of G108-N is larger than the jeans mass, suggesting that G108-N is
gravitationally unstable and a potential place for a future star formation. The
clump properties of G108-N and G108-S such as the gas temperature and the
column density, are not distinctly different. However, G108-S is slightly more
evolved than G108-N, in the consideration of the CO depletion factor, molecular
abundances, and association with infrared sources. G108-S seems to be affected
by the compression from Sh2-152, while G108-N is relatively protected from the
external effect
