Herschel cold clumps CO survey

The sub-millimetre survey of the Planck space observatory and the far-infrared follow-up mapping of the Herschel space telescope provide an unbiased, large sample of these cold objects. We have observed ^12^CO(1-0) and ^13^CO(1-0) emission in 35 high-density clumps in 26 Herschel fields sampling different environments in the Galaxy.

We derive the physical properties of the objects and estimate their gravitational stability. The densities and temperatures of the clumps were calculated from both the dust continuum and the molecular line data. Kinematic distances were derived using ^13^CO(1-0) line velocities to verify previous distance estimates and the sizes and masses of the objects were calculated by fitting 2D Gaussian functions to their optical depth distribution maps on 250um.